{"id":198436,"date":"2024-10-19T12:37:56","date_gmt":"2024-10-19T12:37:56","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/nfpa-70-national-electrical-code-nec-2020-2\/"},"modified":"2024-10-25T05:10:57","modified_gmt":"2024-10-25T05:10:57","slug":"nfpa-70-national-electrical-code-nec-2020-2","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/nfpa\/nfpa-70-national-electrical-code-nec-2020-2\/","title":{"rendered":"NFPA 70, National Electrical Code (NEC) 2020"},"content":{"rendered":"

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
1<\/td>\nCopyright
Edition
Origin and Development
Committee Lists for NEC-70-2020 <\/td>\n<\/tr>\n
35<\/td>\nARTICLE 90 Introduction 90.1 Purpose. 90.1(A) Practical Safeguarding.
90.1(B) Adequacy.
90.1(C) Relation to Other International Standards. <\/td>\n<\/tr>\n
36<\/td>\n90.2 Scope. 90.2(A) Covered.
90.2(B) Not Covered.
90.2(C) Special Permission.
90.3 Code Arrangement.
Figure 90.3 Code Arrangement. <\/td>\n<\/tr>\n
37<\/td>\n90.4 Enforcement. <\/td>\n<\/tr>\n
38<\/td>\n90.5 Mandatory Rules, Permissive Rules, and Explanatory Material. 90.5(A) Mandatory Rules.
90.5(B) Permissive Rules.
90.5(C) Explanatory Material.
90.5(D) Informative Annexes.
90.6 Formal Interpretations.
90.7 Examination of Equipment for Safety.
90.8 Wiring Planning. 90.8(A) Future Expansion and Convenience.
90.8(B) Number of Circuits in Enclosures.
90.9 Units of Measurement. 90.9(A) Measurement System of Preference.
90.9(B) Dual System of Units.
90.9(C) Permitted Uses of Soft Conversion.
90.9(C)(1) Trade Sizes.
90.9(C)(2) Extracted Material. <\/td>\n<\/tr>\n
39<\/td>\n90.9(C)(3) Industry Practice.
90.9(C)(4) Safety.
90.9(D) Compliance.
Chapter 1 General
ARTICLE 100 Definitions <\/td>\n<\/tr>\n
59<\/td>\nARTICLE 110 Requirements for Electrical Installations
110.1 Scope.
110.2 Approval.
110.3 Examination, Identification, Installation, Use, and Listing (Product Certification) of Equipment. 110.3(A) Examination. <\/td>\n<\/tr>\n
60<\/td>\n110.3(B) Installation and Use.
110.3(C) Listing.
110.4 Voltages.
110.5 Conductors.
110.6 Conductor Sizes.
110.7 Wiring Integrity.
110.8 Wiring Methods.
110.9 Interrupting Rating.
110.10 Circuit Impedance, Short-Circuit Current Ratings, and Other Characteristics.
110.11 Deteriorating Agents.
110.12 Mechanical Execution of Work. <\/td>\n<\/tr>\n
61<\/td>\n110.12(A) Unused Openings.
110.12(B) Integrity of Electrical Equipment and Connections.
110.12(C) Cables and Conductors.
110.13 Mounting and Cooling of Equipment. 110.13(A) Mounting.
110.13(B) Cooling.
110.14 Electrical Connections.
110.14(A) Terminals.
110.14(B) Splices.
110.14(C) Temperature Limitations.
110.14(C)(1) Equipment Provisions. <\/td>\n<\/tr>\n
62<\/td>\n110.14(C)(2) Separate Connector Provisions.
110.14(D) Terminal Connection Torque.
110.15 High-Leg Marking.
110.16 Arc-Flash Hazard Warning. 110.16(A) General.
110.16(B) Service Equipment.
110.18 Arcing Parts.
110.19 Light and Power from Railway Conductors.
110.21 Marking. 110.21(A) Equipment Markings. 110.21(A)(1) General.
110.21(A)(2) Reconditioned Equipment. <\/td>\n<\/tr>\n
63<\/td>\n110.21(B) Field-Applied Hazard Markings.
110.22 Identification of Disconnecting Means. 110.22(A) General.
110.22(B) Engineered Series Combination Systems.
110.22(C) Tested Series Combination Systems.
110.23 Current Transformers.
110.24 Available Fault Current. 110.24(A) Field Marking.
110.24(B) Modifications.
110.25 Lockable Disconnecting Means. <\/td>\n<\/tr>\n
64<\/td>\n110.26(A) Working Space.
110.26(A)(1) Depth of Working Space.
110.26(A)(2) Width of Working Space.
110.26(A)(3) Height of Working Space.
110.26(A)(4) Limited Access.
110.26(A)(5) Separation from High-Voltage Equipment.
110.26(B) Clear Spaces. <\/td>\n<\/tr>\n
65<\/td>\n110.26(C) Entrance to and Egress from Working Space. 110.26(C)(1) Minimum Required.
110.26(C)(2) Large Equipment.
110.26(C)(3) Personnel Doors.
110.26(D) Illumination.
110.26(E) Dedicated Equipment Space.
110.26(E)(1) Indoor.
110.26(E)(2) Outdoor.
110.26(F) Locked Electrical Equipment Rooms or Enclosures.
110.27 Guarding of Live Parts. 110.27(A) Live Parts Guarded Against Accidental Contact. <\/td>\n<\/tr>\n
66<\/td>\n110.27(B) Prevent Physical Damage.
110.27(C) Warning Signs.
110.28 Enclosure Types. <\/td>\n<\/tr>\n
67<\/td>\n110.31 Enclosure for Electrical Installations.
110.31(A) Electrical Vaults.
110.31(A)(1) Walls and Roof.
110.31(A)(2) Floors.
110.31(A)(3) Doors.
110.31(A)(4) Locks.
110.31(A)(5) Transformers. <\/td>\n<\/tr>\n
68<\/td>\n110.31(B) Indoor Installations. 110.31(B)(1) In Places Accessible to Unqualified Persons.
110.31(B)(2) In Places Accessible to Qualified Persons Only.
110.31(C) Outdoor Installations. 110.31(C)(1) In Places Accessible to Unqualified Persons.
110.31(C)(2) In Places Accessible to Qualified Persons Only.
110.31(D) Enclosed Equipment Accessible to Unqualified Persons.
110.32 Work Space About Equipment.
110.33 Entrance to Enclosures and Access to Working Space. 110.33(A) Entrance.
110.33(A)(1) Large Equipment.
110.33(A)(2) Guarding.
110.33(A)(3) Personnel Doors.
110.33(B) Access.
110.34 Work Space and Guarding. 110.34(A) Working Space. <\/td>\n<\/tr>\n
69<\/td>\n110.34(B) Separation from Low-Voltage Equipment.
110.34(C) Locked Rooms or Enclosures.
110.34(D) Illumination.
110.34(E) Elevation of Unguarded Live Parts.
110.34(F) Protection of Service Equipment, Switchgear, and Industrial Control Assemblies.
110.36 Circuit Conductors. <\/td>\n<\/tr>\n
70<\/td>\n110.40 Temperature Limitations at Terminations.
110.41 Inspections and Tests. 110.41(A) Pre-energization and Operating Tests.
110.41(B) Test Report.
Part IV. Tunnel Installations over 1000 Volts, Nominal 110.51 General. 110.51(A) Covered.
110.51(B) Other Articles.
110.51(C) Protection Against Physical Damage.
110.52 Overcurrent Protection.
110.53 Conductors.
110.54 Bonding and Equipment Grounding Conductors. 110.54(A) Grounded and Bonded.
110.54(B) Equipment Grounding Conductors.
110.55 Transformers, Switches, and Electrical Equipment.
110.56 Energized Parts.
110.57 Ventilation System Controls.
110.58 Disconnecting Means.
110.59 Enclosures.
Part V. Manholes and Other Electrical Enclosures Intended for Personnel Entry 110.70 General. <\/td>\n<\/tr>\n
71<\/td>\n110.71 Strength.
110.72 Cabling Work Space.
110.73 Equipment Work Space.
110.74 Conductor Installation.
110.74(A) 1000 Volts, Nominal, or Less.
110.74(B) Over 1000 Volts, Nominal.
110.75 Access to Manholes. 110.75(A) Dimensions.
110.75(B) Obstructions.
110.75(C) Location.
110.75(D) Covers.
110.75(E) Marking.
110.76 Access to Vaults and Tunnels. 110.76(A) Location. <\/td>\n<\/tr>\n
72<\/td>\n110.76(B) Locks.
110.77 Ventilation.
110.78 Guarding.
110.79 Fixed Ladders.
Chapter 2 Wiring and Protection
ARTICLE 200 Use and Identification of Grounded Conductors 200.1 Scope.
200.2 General.
200.2(A) Insulation.
200.2(B) Continuity.
200.3 Connection to Grounded System.
200.4 Neutral Conductors.
200.4(A) Installation.
200.4(B) Multiple Circuits.
200.6 Means of Identifying Grounded Conductors. 200.6(A) Sizes 6 AWG or Smaller. <\/td>\n<\/tr>\n
73<\/td>\n200.6(B) Sizes 4 AWG or Larger.
200.6(C) Flexible Cords.
200.6(D) Grounded Conductors of Different Systems.
200.6(E) Grounded Conductors of Multiconductor Cables.
200.7 Use of Insulation of a White or Gray Color or with Three Continuous White or Gray Stripes. 200.7(A) General.
200.7(B) Circuits of Less Than 50 Volts.
200.7(C) Circuits of 50 Volts or More.
200.9 Means of Identification of Terminals. <\/td>\n<\/tr>\n
74<\/td>\n200.10 Identification of Terminals. 200.10(A) Device Terminals.
200.10(B) Receptacles, Plugs, and Connectors.
200.10(C) Screw Shells.
200.10(D) Screw Shell Devices with Leads.
200.10(E) Appliances.
200.11 Polarity of Connections.
ARTICLE 210 Branch Circuits Part I. General Provisions 210.1 Scope.
210.3 Other Articles for Specific-Purpose Branch Circuits.
210.4 Multiwire Branch Circuits. <\/td>\n<\/tr>\n
75<\/td>\n210.4(A) General.
210.4(B) Disconnecting Means.
210.4(C) Line-to-Neutral Loads.
210.4(D) Grouping.
210.5 Identification for Branch Circuits. 210.5(A) Grounded Conductor.
210.5(B) Equipment Grounding Conductor.
210.5(C) Identification of Ungrounded Conductors.
210.5(C)(1) Branch Circuits Supplied from More Than One Nominal Voltage System.
210.5(C)(2) Branch Circuits Supplied from Direct-Current Systems.
210.6 Branch-Circuit Voltage Limitations. <\/td>\n<\/tr>\n
76<\/td>\n210.6(A) Occupancy Limitation.
210.6(B) 120 Volts Between Conductors.
210.6(C) 277 Volts to Ground.
210.6(D) 600 Volts Between Conductors.
210.6(E) Over 600 Volts Between Conductors.
210.7 Multiple Branch Circuits.
210.8 Ground-Fault Circuit-Interrupter Protection for Personnel.
210.8(A) Dwelling Units. <\/td>\n<\/tr>\n
77<\/td>\n210.8(B) Other Than Dwelling Units.
210.8(C) Crawl Space Lighting Outlets.
210.8(D) Specific Appliances.
210.8(E) Equipment Requiring Servicing.
210.8(F) Outdoor Outlets.
210.9 Circuits Derived from Autotransformers. <\/td>\n<\/tr>\n
78<\/td>\n210.10 Ungrounded Conductors Tapped from Grounded Systems.
210.11 Branch Circuits Required.
210.11(A) Number of Branch Circuits.
210.11(B) Load Evenly Proportioned Among Branch Circuits.
210.11(C) Dwelling Units. 210.11(C)(1) Small-Appliance Branch Circuits.
210.11(C)(2) Laundry Branch Circuits.
210.11(C)(3) Bathroom Branch Circuits.
210.11(C)(4) Garage Branch Circuits.
210.12 Arc-Fault Circuit-Interrupter Protection.
210.12(A) Dwelling Units. <\/td>\n<\/tr>\n
79<\/td>\n210.12(B) Dormitory Units.
210.12(C) Guest Rooms, Guest Suites, and Patient Sleeping Rooms in Nursing Homes and Limited-Care Facilities.
210.12(D) Branch Circuit Extensions or Modifications \u2014 Dwelling Units, Dormitory Units, and Guest Rooms and Guest Suites.
210.13 Ground-Fault Protection of Equipment.
210.15 Reconditioned Equipment.
210.17 Guest Rooms and Guest Suites.
Part II. Branch-Circuit Ratings 210.18 Rating.
210.19 Conductors \u2014 Minimum Ampacity and Size. 210.19(A) Branch Circuits Not More Than 600 Volts. <\/td>\n<\/tr>\n
80<\/td>\n210.19(A)(1) General.
210.19(A)(2) Branch Circuits with More than One Receptacle.
210.19(A)(3) Household Ranges and Cooking Appliances.
210.19(A)(4) Other Loads.
210.19(B) Branch Circuits Over 600 Volts.
210.19(B)(1) General.
210.19(B)(2) Supervised Installations.
210.20 Overcurrent Protection.
210.20(A) Continuous and Noncontinuous Loads.
210.20(B) Conductor Protection. <\/td>\n<\/tr>\n
81<\/td>\n210.20(C) Equipment.
210.20(D) Outlet Devices.
210.21 Outlet Devices.
210.21(A) Lampholders.
210.21(B) Receptacles. 210.21(B)(1) Single Receptacle on an Individual Branch Circuit.
210.21(B)(2) Total Cord-and-Plug-Connected Load.
210.21(B)(3) Receptacle Ratings.
210.21(B)(4) Range Receptacle Rating. <\/td>\n<\/tr>\n
82<\/td>\n210.22 Permissible Loads, Individual Branch Circuits.
210.23 Permissible Loads, Multiple-Outlet Branch Circuits.
210.23(A) 15and 20-Ampere Branch Circuits.
210.23(A)(1) Cord-and-Plug-Connected Equipment Not Fastened in Place.
210.23(A)(2) Utilization Equipment Fastened in Place.
210.23(B) 30-Ampere Branch Circuits.
210.23(C) 40and 50-Ampere Branch Circuits.
210.23(D) Branch Circuits Larger Than 50 Amperes.
210.24 Branch-Circuit Requirements \u2014 Summary.
210.25 Branch Circuits in Buildings with More Than One Occupancy. 210.25(A) Dwelling Unit Branch Circuits. <\/td>\n<\/tr>\n
83<\/td>\n210.25(B) Common Area Branch Circuits.
Part III. Required Outlets 210.50 Receptacle Outlets.
210.50(A) Cord Pendants.
210.50(B) Cord Connections.
210.50(C) Appliance Receptacle Outlets.
210.52 Dwelling Unit Receptacle Outlets.
210.52(A) General Provisions.
210.52(A)(1) Spacing.
210.52(A)(2) Wall Space.
210.52(A)(3) Floor Receptacles.
210.52(A)(4) Countertop and Similar Work Surface Receptacle Outlets.
210.52(B) Small Appliances. 210.52(B)(1) Receptacle Outlets Served.
210.52(B)(2) No Other Outlets. <\/td>\n<\/tr>\n
84<\/td>\n210.52(B)(3) Kitchen Receptacle Requirements.
210.52(C) Countertops and Work Surfaces.
210.52(C)(1) Wall Spaces.
Figure 210.52(C)(1) Determination of Area Behind a Range, Counter-Mounted Cooking Unit, or Sink. <\/td>\n<\/tr>\n
85<\/td>\n210.52(C)(2) Island and Peninsular Countertops and Work Surfaces.
210.52(C)(3) Receptacle Outlet Location. <\/td>\n<\/tr>\n
86<\/td>\n210.52(D) Bathrooms.
210.52(E) Outdoor Outlets.
210.52(E)(1) One-Family and Two-Family Dwellings.
210.52(E)(2) Multifamily Dwellings.
210.52(E)(3) Balconies, Decks, and Porches.
210.52(F) Laundry Areas.
210.52(G) Basements, Garages, and Accessory Buildings.
210.52(G)(1) Garages.
210.52(G)(2) Accessory Buildings.
210.52(G)(3) Basements.
210.52(H) Hallways.
210.52(I) Foyers.
210.60 Guest Rooms, Guest Suites, Dormitory Units, and Similar Occupancies. 210.60(A) General. <\/td>\n<\/tr>\n
87<\/td>\n210.60(B) Receptacle Placement.
210.62 Show Windows.
210.63 Equipment Requiring Servicing.
210.63(A) Heating, Air-Conditioning, and Refrigeration Equipment.
210.63(B) Other Electrical Equipment.
210.63(B)(1) Indoor Service Equipment.
210.63(B)(2) Indoor Equipment Requiring Dedicated Equipment Spaces.
210.65 Meeting Rooms. 210.65(A) General.
210.65(B) Receptacle Outlets Required.
210.65(B)(1) Receptacle Outlets in Fixed Walls.
210.65(B)(2) Floor Outlets.
210.70 Lighting Outlets Required.
210.70(A) Dwelling Units.
210.70(A)(1) Habitable Rooms.
210.70(A)(2) Additional Locations. <\/td>\n<\/tr>\n
88<\/td>\n210.70(B) Guest Rooms or Guest Suites.
210.70(C) All Occupancies.
ARTICLE 215 Feeders 215.1 Scope.
215.2 Minimum Rating and Size. 215.2(A) Feeders Not More Than 1000 Volts. 215.2(A)(1) General.
215.2(A)(2) Grounded Conductor.
215.2(A)(3) Ampacity Relative to Service Conductors.
215.2(B) Feeders over 1000 Volts.
215.2(B)(1) Feeders Supplying Transformers.
215.2(B)(2) Feeders Supplying Transformers and Utilization Equipment. <\/td>\n<\/tr>\n
89<\/td>\n215.2(B)(3) Supervised Installations.
215.3 Overcurrent Protection.
215.4 Feeders with Common Neutral Conductor. 215.4(A) Feeders with Common Neutral.
215.4(B) In Metal Raceway or Enclosure.
215.5 Diagrams of Feeders.
215.6 Feeder Equipment Grounding Conductor.
215.7 Ungrounded Conductors Tapped from Grounded Systems.
215.9 Ground-Fault Circuit-Interrupter Protection for Personnel.
215.10 Ground-Fault Protection of Equipment.
215.11 Circuits Derived from Autotransformers.
215.12 Identification for Feeders. 215.12(A) Grounded Conductor.
215.12(B) Equipment Grounding Conductor.
215.12(C) Identification of Ungrounded Conductors. <\/td>\n<\/tr>\n
90<\/td>\n215.12(C)(1) Feeders Supplied from More Than One Nominal Voltage System.
215.12(C)(2) Feeders Supplied from Direct-Current Systems.
ARTICLE 220 Branch-Circuit, Feeder, and Service Load Calculations Part I. General 220.1 Scope.
Figure 220.1 Branch-Circuit, Feeder, and Service Load Calculation Methods. <\/td>\n<\/tr>\n
91<\/td>\n220.3 Other Articles for Specific-Purpose Calculations.
220.5 Calculations. 220.5(A) Voltages.
220.5(B) Fractions of an Ampere.
220.11 Floor Area.
220.12 Lighting Load for Non-Dwelling Occupancies. 220.12(A) General.
220.12(B) Energy Code. <\/td>\n<\/tr>\n
92<\/td>\n220.14 Other Loads \u2014 All Occupancies. <\/td>\n<\/tr>\n
93<\/td>\n220.14(A) Specific Appliances or Loads.
220.14(B) Electric Dryers and Electric Cooking Appliances in Dwellings and Household Cooking Appliances Used in Instructional Pr
220.14(C) Motor Outlets.
220.14(D) Luminaires.
220.14(E) Heavy-Duty Lampholders.
220.14(F) Sign and Outline Lighting.
220.14(G) Show Windows.
220.14(H) Fixed Multioutlet Assemblies.
220.14(I) Receptacle Outlets.
220.14(J) Dwelling Units.
220.14(K) Office Buildings.
220.14(L) Other Outlets.
220.14(M) Hotel and Motel Occupancies.
220.16 Loads for Additions to Existing Installations. <\/td>\n<\/tr>\n
94<\/td>\n220.16(A) Dwelling Units.
220.16(B) Other Than Dwelling Units.
220.18 Maximum Loads.
220.18(A) Motor-Operated and Combination Loads.
220.18(B) Inductive and LED Lighting Loads.
220.18(C) Range Loads.
Part III. Feeder and Service Load Calculations 220.40 General.
220.42 General Lighting.
220.43 Show-Window and Track Lighting. 220.43(A) Show Windows.
220.43(B) Track Lighting. <\/td>\n<\/tr>\n
95<\/td>\n220.44 Receptacle Loads \u2014 Other Than Dwelling Units.
220.50 Motors.
220.51 Fixed Electric Space Heating.
220.52 Small-Appliance and Laundry Loads \u2014 Dwelling Unit. 220.52(A) Small-Appliance Circuit Load.
220.52(B) Laundry Circuit Load.
220.53 Appliance Load \u2014 Dwelling Unit(s).
220.54 Electric Clothes Dryers \u2014 Dwelling Unit(s). <\/td>\n<\/tr>\n
96<\/td>\n220.55 Electric Cooking Appliances in Dwelling Units and Household Cooking Appliances Used in Instructional Programs. <\/td>\n<\/tr>\n
97<\/td>\n220.56 Kitchen Equipment \u2014 Other Than Dwelling Unit(s).
220.60 Noncoincident Loads.
220.61 Feeder or Service Neutral Load. 220.61(A) Basic Calculation.
220.61(B) Permitted Reductions. <\/td>\n<\/tr>\n
98<\/td>\n220.61(C) Prohibited Reductions.
Part IV. Optional Feeder and Service Load Calculations 220.80 General.
220.82 Dwelling Unit. 220.82(A) Feeder and Service Load.
220.82(B) General Loads.
220.82(C) Heating and Air-Conditioning Load.
220.83 Existing Dwelling Unit.
220.83(A) Where Additional Air-Conditioning Equipment or Electric Space-Heating Equipment Is Not to Be Installed. <\/td>\n<\/tr>\n
99<\/td>\n220.83(B) Where Additional Air-Conditioning Equipment or Electric Space-Heating Equipment Is to Be Installed.
220.84 Multifamily Dwelling. 220.84(A) Feeder or Service Load.
220.84(B) House Loads. <\/td>\n<\/tr>\n
100<\/td>\n220.84(C) Calculated Loads.
220.85 Two Dwelling Units.
220.86 Schools. <\/td>\n<\/tr>\n
101<\/td>\n220.87 Determining Existing Loads.
220.88 New Restaurants.
Part V. Farm Load Calculations 220.100 General.
220.102 Farm Loads \u2014 Buildings and Other Loads. 220.102(A) Dwelling Unit.
220.102(B) Other Than Dwelling Unit. <\/td>\n<\/tr>\n
102<\/td>\n220.103 Farm Loads \u2014 Total.
ARTICLE 225 Outside Branch Circuits and Feeders 225.1 Scope.
225.3 Other Articles. <\/td>\n<\/tr>\n
103<\/td>\n225.5 Size of Conductors 1000 Volts, Nominal, or Less.
225.6 Conductor Size and Support. 225.6(A) Overhead Spans.
225.6(B) Festoon Lighting.
225.7 Lighting Equipment Installed Outdoors. 225.7(A) General.
225.7(B) Common Neutral.
225.7(C) 277 Volts to Ground.
225.7(D) 1000 Volts Between Conductors. <\/td>\n<\/tr>\n
104<\/td>\n225.10 Wiring on Buildings (or Other Structures).
225.11 Feeder and Branch-Circuit Conductors Entering, Exiting, or Attached to Buildings or Structures.
225.12 Open-Conductor Supports.
225.14 Open-Conductor Spacings. 225.14(A) 1000 Volts, Nominal, or Less.
225.14(B) Over 1000 Volts, Nominal.
225.14(C) Separation from Other Circuits.
225.14(D) Conductors on Poles.
225.15 Supports over Buildings.
225.16 Attachment to Buildings. 225.16(A) Point of Attachment.
225.16(B) Means of Attachment.
225.17 Masts as Supports. <\/td>\n<\/tr>\n
105<\/td>\n225.17(A) Strength.
225.17(B) Attachment.
225.18 Clearance for Overhead Conductors and Cables.
225.19 Clearances from Buildings for Conductors of Not over 1000 Volts, Nominal.
225.19(A) Above Roofs.
225.19(B) From Nonbuilding or Nonbridge Structures.
225.19(C) Horizontal Clearances.
225.19(D) Final Spans.
225.19(D)(1) Clearance from Windows.
225.19(D)(2) Vertical Clearance.
225.19(D)(3) Building Openings.
225.19(E) Zone for Fire Ladders.
225.20 Protection Against Physical Damage.
225.21 Multiconductor Cables on Exterior Surfaces of Buildings (or Other Structures). <\/td>\n<\/tr>\n
106<\/td>\n225.22 Raceways on Exterior Surfaces of Buildings or Other Structures.
225.24 Outdoor Lampholders.
225.25 Location of Outdoor Lamps.
225.26 Vegetation as Support.
225.27 Raceway Seal.
Part II. Buildings or Other Structures Supplied by a Feeder(s) or Branch Circuit(s) 225.30 Number of Supplies.
225.30(A) Special Conditions.
225.30(B) Common Supply Equipment.
225.30(C) Special Occupancies.
225.30(D) Capacity Requirements.
225.30(E) Different Characteristics.
225.30(F) Documented Switching Procedures.
225.31 Disconnecting Means.
225.32 Location. <\/td>\n<\/tr>\n
107<\/td>\n225.33 Maximum Number of Disconnects. 225.33(A) General.
225.33(B) Single-Pole Units.
225.34 Grouping of Disconnects. 225.34(A) General.
225.34(B) Additional Disconnecting Means.
225.35 Access to Occupants.
225.36 Type of Disconnecting Means.
225.37 Identification.
225.38 Disconnect Construction.
225.38(A) Manually or Power Operable.
225.38(B) Simultaneous Opening of Poles.
225.38(C) Disconnection of Grounded Conductor.
225.38(D) Indicating. <\/td>\n<\/tr>\n
108<\/td>\n225.39 Rating of Disconnect.
225.39(A) One-Circuit Installation.
225.39(B) Two-Circuit Installations.
225.39(C) One-Family Dwelling.
225.39(D) All Others.
225.40 Access to Overcurrent Protective Devices.
Part III. Over 1000 Volts. 225.50 Sizing of Conductors.
225.51 Isolating Switches.
225.52 Disconnecting Means. 225.52(A) Location.
225.52(B) Type.
225.52(C) Locking.
225.52(D) Indicating.
225.52(E) Uniform Position.
225.52(F) Identification.
225.56 Inspections and Tests. 225.56(A) Pre-Energization and Operating Tests. <\/td>\n<\/tr>\n
109<\/td>\n225.56(A)(1) Instrument Transformers.
225.56(A)(2) Protective Relays.
225.56(A)(3) Switching Circuits.
225.56(A)(4) Control and Signal Circuits.
225.56(A)(5) Metering Circuits.
225.56(A)(6) Acceptance Tests.
225.56(A)(7) Relays and Metering Utilizing Phase Differences.
225.56(B) Test Report.
225.60 Clearances over Roadways, Walkways, Rail, Water, and Open Land. 225.60(A) 22 kV, Nominal, to Ground or Less.
225.60(B) Over 22 kV Nominal to Ground.
225.60(C) Special Cases.
225.61 Clearances over Buildings and Other Structures. 225.61(A) 22 kV Nominal to Ground or Less.
225.61(B) Over 22 kV Nominal to Ground. <\/td>\n<\/tr>\n
110<\/td>\nARTICLE 230 Services 230.1 Scope.
Figure 230.1 Services. <\/td>\n<\/tr>\n
111<\/td>\nPart I. General 230.2 Number of Services.
230.2(A) Special Conditions.
230.2(B) Special Occupancies. <\/td>\n<\/tr>\n
112<\/td>\n230.2(C) Capacity Requirements.
230.2(D) Different Characteristics.
230.2(E) Identification.
230.3 One Building or Other Structure Not to Be Supplied Through Another.
230.6 Conductors Considered Outside the Building.
230.7 Other Conductors in Raceway or Cable.
230.8 Raceway Seal.
230.9 Clearances on Buildings.
230.9(A) Clearances.
230.9(B) Vertical Clearance.
230.9(C) Building Openings.
230.10 Vegetation as Support.
Part II. Overhead Service Conductors 230.22 Insulation or Covering.
230.23 Size and Ampacity. <\/td>\n<\/tr>\n
113<\/td>\n230.23(A) General.
230.23(B) Minimum Size.
230.23(C) Grounded Conductors.
230.24 Clearances.
230.24(A) Above Roofs.
230.24(B) Vertical Clearance for Overhead Service Conductors.
230.24(C) Clearance from Building Openings.
230.24(D) Clearance from Swimming Pools.
230.24(E) Clearance from Communication Wires and Cables.
230.26 Point of Attachment.
230.27 Means of Attachment.
230.28 Service Masts as Supports.
230.28(A) Strength.
230.28(B) Attachment.
230.29 Supports over Buildings. <\/td>\n<\/tr>\n
114<\/td>\nPart III. Underground Service Conductors 230.30 Installation. 230.30(A) Insulation.
230.30(B) Wiring Methods.
230.31 Size and Ampacity. 230.31(A) General.
230.31(B) Minimum Size.
230.31(C) Grounded Conductors.
230.32 Protection Against Damage.
230.33 Spliced Conductors.
Part IV. Service-Entrance Conductors 230.40 Number of Service-Entrance Conductor Sets. <\/td>\n<\/tr>\n
115<\/td>\n230.41 Insulation of Service-Entrance Conductors.
230.42 Minimum Size and Ampacity. 230.42(A) General.
230.42(B) Specific Installations.
230.42(C) Grounded Conductors.
230.43 Wiring Methods for 1000 Volts, Nominal, or Less.
230.44 Cable Trays. <\/td>\n<\/tr>\n
116<\/td>\n230.46 Spliced and Tapped Conductors.
230.50 Protection Against Physical Damage. 230.50(A) Underground Service-Entrance Conductors.
230.50(B) All Other Service-Entrance Conductors.
230.50(B)(1) Service-Entrance Cables.
230.50(B)(2) Other Than Service-Entrance Cables.
230.51 Mounting Supports.
230.51(A) Service-Entrance Cables.
230.51(B) Other Cables.
230.51(C) Individual Open Conductors. <\/td>\n<\/tr>\n
117<\/td>\n230.52 Individual Conductors Entering Buildings or Other Structures.
230.53 Raceways to Drain.
230.54 Overhead Service Locations. 230.54(A) Service Head.
230.54(B) Service-Entrance Cables Equipped with Service Head or Gooseneck.
230.54(C) Service Heads and Goosenecks Above Service-Drop or Overhead Service Attachment.
230.54(D) Secured.
230.54(E) Separately Bushed Openings.
230.54(F) Drip Loops.
230.54(G) Arranged That Water Will Not Enter Service Raceway or Equipment.
230.56 Service Conductor with the Higher Voltage to Ground.
Part V. Service Equipment \u2014 General 230.62 Service Equipment \u2014 Enclosed or Guarded.
230.62(A) Enclosed.
230.62(B) Guarded.
230.62(C) Barriers.
230.66 Marking. 230.66(A) General.
230.66(B) Meter Sockets. <\/td>\n<\/tr>\n
118<\/td>\n230.67 Surge Protection. 230.67(A) Surge-Protective Device.
230.67(B) Location.
230.67(C) Type.
230.67(D) Replacement.
Part VI. Service Equipment \u2014 Disconnecting Means 230.70 General.
230.70(A) Location.
230.70(A)(1) Readily Accessible Location.
230.70(A)(2) Bathrooms.
230.70(A)(3) Remote Control.
230.70(B) Marking.
230.70(C) Suitable for Use.
230.71 Maximum Number of Disconnects.
230.71(A) General.
230.71(B) Two to Six Service Disconnecting Means.
230.72 Grouping of Disconnects. 230.72(A) General. <\/td>\n<\/tr>\n
119<\/td>\n230.72(B) Additional Service Disconnecting Means.
230.72(C) Access to Occupants.
230.74 Simultaneous Opening of Poles.
230.75 Disconnection of Grounded Conductor.
230.76 Manually or Power Operable.
230.77 Indicating.
230.79 Rating of Service Disconnecting Means.
230.79(A) One-Circuit Installations.
230.79(B) Two-Circuit Installations.
230.79(C) One-Family Dwellings.
230.79(D) All Others.
230.80 Combined Rating of Disconnects.
230.81 Connection to Terminals.
230.82 Equipment Connected to the Supply Side of Service Disconnect. <\/td>\n<\/tr>\n
120<\/td>\n230.85 Emergency Disconnects.
Part VII. Service Equipment \u2014 Overcurrent Protection 230.90 Where Required.
230.90(A) Ungrounded Conductor.
230.90(B) Not in Grounded Conductor.
230.91 Location.
230.92 Locked Service Overcurrent Devices.
230.93 Protection of Specific Circuits.
230.94 Relative Location of Overcurrent Device and Other Service Equipment. <\/td>\n<\/tr>\n
121<\/td>\n230.95 Ground-Fault Protection of Equipment.
230.95(A) Setting.
230.95(B) Fuses.
230.95(C) Performance Testing.
Part VIII. Services Exceeding 1000 Volts, Nominal 230.200 General.
230.202 Service-Entrance Conductors.
230.202(A) Conductor Size.
230.202(B) Wiring Methods.
230.204 Isolating Switches. 230.204(A) Where Required.
230.204(B) Fuses as Isolating Switch. <\/td>\n<\/tr>\n
122<\/td>\n230.204(C) Accessible to Qualified Persons Only.
230.204(D) Connection to Ground.
230.205 Disconnecting Means. 230.205(A) Location.
230.205(B) Type.
230.205(C) Remote Control.
230.206 Overcurrent Devices as Disconnecting Means.
230.208 Protection Requirements.
230.208(A) Equipment Type.
230.208(B) Enclosed Overcurrent Devices.
230.209 Surge Arresters.
230.210 Service Equipment \u2014 General Provisions.
230.211 Switchgear.
230.212 Over 35,000 Volts.
ARTICLE 240 Overcurrent Protection Part I. General 240.1 Scope. <\/td>\n<\/tr>\n
123<\/td>\n240.2 Definitions.
Current-Limiting Overcurrent Protective Device.
Supervised Industrial Installation.
Tap Conductor.
240.3 Other Articles. <\/td>\n<\/tr>\n
124<\/td>\n240.4 Protection of Conductors.
240.4(A) Power Loss Hazard.
240.4(B) Overcurrent Devices Rated 800 Amperes or Less.
240.4(C) Overcurrent Devices Rated over 800 Amperes.
240.4(D) Small Conductors.
240.4(D)(1) 18 AWG Copper.
240.4(D)(2) 16 AWG Copper.
240.4(D)(3) 14 AWG Copper. <\/td>\n<\/tr>\n
125<\/td>\n240.4(D)(4) 12 AWG Aluminum and Copper-Clad Aluminum.
240.4(D)(5) 12 AWG Copper.
240.4(D)(6) 10 AWG Aluminum and Copper-Clad Aluminum.
240.4(D)(7) 10 AWG Copper.
240.4(E) Tap Conductors.
240.4(F) Transformer Secondary Conductors.
240.4(G) Overcurrent Protection for Specific Conductor Applications.
240.5 Protection of Flexible Cords, Flexible Cables, and Fixture Wires.
240.5(A) Ampacities.
240.5(B) Branch-Circuit Overcurrent Device.
240.5(B)(1) Supply Cord of Listed Appliance or Luminaire. <\/td>\n<\/tr>\n
126<\/td>\n240.5(B)(2) Fixture Wire.
240.5(B)(3) Extension Cord Sets.
240.5(B)(4) Field Assembled Extension Cord Sets.
240.6 Standard Ampere Ratings. 240.6(A) Fuses and Fixed-Trip Circuit Breakers.
240.6(B) Adjustable-Trip Circuit Breakers.
240.6(C) Restricted Access Adjustable-Trip Circuit Breakers.
240.8 Fuses or Circuit Breakers in Parallel.
240.9 Thermal Devices.
240.10 Supplementary Overcurrent Protection. <\/td>\n<\/tr>\n
127<\/td>\n240.12 Electrical System Coordination.
240.13 Ground-Fault Protection of Equipment.
240.15 Ungrounded Conductors. 240.15(A) Overcurrent Device Required.
240.15(B) Circuit Breaker as Overcurrent Device.
240.15(B)(1) Multiwire Branch Circuits.
240.15(B)(2) Grounded Single-Phase Alternating-Current Circuits.
240.15(B)(3) 3-Phase and 2-Phase Systems.
240.15(B)(4) 3-Wire Direct-Current Circuits.
Part II. Location 240.21 Location in Circuit.
240.21(A) Branch-Circuit Conductors.
240.21(B) Feeder Taps.
240.21(B)(1) Taps Not over 3 m (10 ft) Long. <\/td>\n<\/tr>\n
128<\/td>\n240.21(B)(2) Taps Not over 7.5 m (25 ft) Long.
240.21(B)(3) Taps Supplying a Transformer [Primary Plus Secondary Not over 7.5 m (25 ft) Long].
240.21(B)(4) Taps over 7.5 m (25 ft) Long.
240.21(B)(5) Outside Taps of Unlimited Length.
240.21(C) Transformer Secondary Conductors.
240.21(C)(1) Protection by Primary Overcurrent Device.
240.21(C)(2) Transformer Secondary Conductors Not over 3 m (10 ft) Long. <\/td>\n<\/tr>\n
129<\/td>\n240.21(C)(3) Industrial Installation Secondary Conductors Not over 7.5 m (25 ft) Long.
240.21(C)(4) Outside Secondary Conductors.
240.21(C)(5) Secondary Conductors from a Feeder Tapped Transformer.
240.21(C)(6) Secondary Conductors Not over 7.5 m (25 ft) Long.
240.21(D) Service Conductors.
240.21(E) Busway Taps.
240.21(F) Motor Circuit Taps.
240.21(G) Conductors from Generator Terminals.
240.21(H) Battery Conductors.
240.22 Grounded Conductor.
240.24 Location in or on Premises. 240.24(A) Accessibility. <\/td>\n<\/tr>\n
130<\/td>\n240.24(B) Occupancy.
240.24(B)(1) Service and Feeder Overcurrent Devices.
240.24(B)(2) Branch-Circuit Overcurrent Devices.
240.24(C) Not Exposed to Physical Damage.
240.24(D) Not in Vicinity of Easily Ignitible Material.
240.24(E) Not Located in Bathrooms.
240.24(F) Not Located over Steps.
Part III. Enclosures 240.30 General. 240.30(A) Protection from Physical Damage.
240.30(B) Operating Handle.
240.32 Damp or Wet Locations.
240.33 Vertical Position.
Part IV. Disconnecting and Guarding 240.40 Disconnecting Means for Fuses.
240.41 Arcing or Suddenly Moving Parts.
240.41(A) Location. <\/td>\n<\/tr>\n
131<\/td>\n240.41(B) Suddenly Moving Parts.
Part V. Plug Fuses, Fuseholders, and Adapters 240.50 General. 240.50(A) Maximum Voltage.
240.50(B) Marking.
240.50(C) Hexagonal Configuration.
240.50(D) No Energized Parts.
240.50(E) Screw Shell.
240.51 Edison-Base Fuses. 240.51(A) Classification.
240.51(B) Replacement Only.
240.52 Edison-Base Fuseholders.
240.53 Type S Fuses.
240.53(A) Classification.
240.53(B) Noninterchangeable.
240.54 Type S Fuses, Adapters, and Fuseholders. 240.54(A) To Fit Edison-Base Fuseholders.
240.54(B) To Fit Type S Fuses Only.
240.54(C) Nonremovable.
240.54(D) Nontamperable.
240.54(E) Interchangeability.
Part VI. Cartridge Fuses and Fuseholders <\/td>\n<\/tr>\n
132<\/td>\n240.60 General. 240.60(A) Maximum Voltage \u2014 300-Volt Type.
240.60(B) Noninterchangeable \u2014 0\u20136000-Ampere Cartridge Fuseholders.
240.60(C) Marking.
240.60(D) Renewable Fuses.
240.61 Classification.
240.62 Reconditioned Equipment.
240.67 Arc Energy Reduction.
240.67(A) Documentation.
240.67(B) Method to Reduce Clearing Time.
240.67(C) Performance Testing.
Part VII. Circuit Breakers <\/td>\n<\/tr>\n
133<\/td>\n240.80 Method of Operation.
240.81 Indicating.
240.82 Nontamperable.
240.83 Marking. 240.83(A) Durable and Visible.
240.83(B) Location.
240.83(C) Interrupting Rating.
240.83(D) Used as Switches.
240.83(E) Voltage Marking.
240.85 Applications.
240.86 Series Ratings.
240.86(A) Selected Under Engineering Supervision in Existing Installations.
240.86(B) Tested Combinations.
240.86(C) Motor Contribution.
240.87 Arc Energy Reduction.
240.87(A) Documentation.
240.87(B) Method to Reduce Clearing Time. <\/td>\n<\/tr>\n
134<\/td>\n240.87(C) Performance Testing.
240.88 Reconditioned Equipment.
240.88(A) Circuit Breakers.
240.88(B) Components.
Part VIII. Supervised Industrial Installations 240.90 General.
240.91 Protection of Conductors.
240.91(A) General.
240.91(B) Devices Rated Over 800 Amperes.
240.92 Location in Circuit.
240.92(A) Feeder and Branch-Circuit Conductors. <\/td>\n<\/tr>\n
135<\/td>\n240.92(B) Feeder Taps.
240.92(C) Transformer Secondary Conductors of Separately Derived Systems.
240.92(C)(1) Short-Circuit and Ground-Fault Protection.
240.92(C)(2) Overload Protection. <\/td>\n<\/tr>\n
136<\/td>\n240.92(C)(3) Physical Protection.
240.92(D) Outside Feeder Taps.
240.92(E) Protection by Primary Overcurrent Device.
Part IX. Overcurrent Protection over 1000 Volts, Nominal 240.100 Feeders and Branch Circuits. 240.100(A) Location and Type of Pr
240.100(A)(1) Overcurrent Relays and Current Transformers.
240.100(A)(2) Fuses.
240.100(B) Protective Devices.
240.100(C) Conductor Protection.
240.101 Additional Requirements for Feeders. 240.101(A) Rating or Setting of Overcurrent Protective Devices.
240.101(B) Feeder Taps.
240.102 Reconditioned Equipment.
ARTICLE 242 Overvoltage Protection Part I. General 242.1 Scope. <\/td>\n<\/tr>\n
137<\/td>\n242.3 Other Articles.
Part II. Surge-Protective Devices (SPDs), 1000 Volts or Less
242.6 Uses Not Permitted.
242.8 Listing.
242.10 Short-Circuit Current Rating.
242.12 Type 1 SPDs.
242.12(A) Installation.
242.12(B) At the Service. <\/td>\n<\/tr>\n
138<\/td>\n242.14 Type 2 SPDs.
242.14(A) Service-Supplied Building or Structure.
242.14(B) Feeder-Supplied Building or Structure.
242.14(C) Separately Derived System.
242.16 Type 3 SPDs.
242.18 Type 4 and Other Component Type SPDs.
242.20 Number Required.
242.22 Location.
242.24 Routing of Connections.
242.26 Connection.
242.28 Conductor Size.
242.30 Connection Between Conductors.
242.32 Grounding Electrode Conductor Connections and Enclosures.
Part III. Surge Arresters, Over 1000 Volts 242.40 Uses Not Permitted.
242.42 Surge Arrester Selection.
242.42(A) Rating.
242.42(A)(1) Solidly Grounded Systems.
242.42(A)(2) Impedance or Ungrounded System.
242.42(B) Silicon Carbide Types. <\/td>\n<\/tr>\n
139<\/td>\n242.44 Number Required.
242.46 Location.
242.48 Routing of Surge Arrester Equipment Grounding Conductors.
242.50 Connection.
242.52 Surge-Arrester Conductors.
242.54 Interconnections.
242.54(A) Metal Interconnections.
242.54(A)(1) Additional Grounding Connection.
242.54(A)(2) Multigrounded Neutral System Connection.
242.54(B) Through Spark Gap or Device.
242.54(B)(1) Ungrounded or Unigrounded Primary System.
242.54(B)(2) Multigrounded Neutral Primary System.
242.54(C) By Special Permission.
242.56 Grounding Electrode Conductor Connections and Enclosures.
ARTICLE 250 Grounding and Bonding Part I. General 250.1 Scope. <\/td>\n<\/tr>\n
140<\/td>\nFigure 250.1 Grounding and Bonding. 250.3 Application of Other Articles. <\/td>\n<\/tr>\n
142<\/td>\n250.4 General Requirements for Grounding and Bonding.
250.4(A) Grounded Systems. 250.4(A)(1) Electrical System Grounding.
250.4(A)(2) Grounding of Electrical Equipment.
250.4(A)(3) Bonding of Electrical Equipment.
250.4(A)(4) Bonding of Electrically Conductive Materials and Other Equipment.
250.4(A)(5) Effective Ground-Fault Current Path.
250.4(B) Ungrounded Systems. 250.4(B)(1) Grounding Electrical Equipment.
250.4(B)(2) Bonding of Electrical Equipment.
250.4(B)(3) Bonding of Electrically Conductive Materials and Other Equipment.
250.4(B)(4) Path for Fault Current.
250.6 Objectionable Current. 250.6(A) Arrangement to Prevent Objectionable Current.
250.6(B) Alterations to Stop Objectionable Current. <\/td>\n<\/tr>\n
143<\/td>\n250.6(C) Temporary Currents Not Classified as Objectionable Currents.
250.6(D) Limitations to Permissible Alterations.
250.6(E) Isolation of Objectionable Direct-Current Ground Currents.
250.8 Connection of Grounding and Bonding Equipment. 250.8(A) Permitted Methods.
250.8(B) Methods Not Permitted.
250.10 Protection of Ground Clamps and Fittings.
250.12 Clean Surfaces.
Part II. System Grounding 250.20 Alternating-Current Systems to Be Grounded.
250.20(A) Alternating-Current Systems of Less Than 50 Volts.
250.20(B) Alternating-Current Systems of 50 Volts to 1000 Volts.
250.20(C) Alternating-Current Systems of over 1000 Volts.
250.20(D) Impedance Grounded Neutral Systems. <\/td>\n<\/tr>\n
144<\/td>\n250.21 Alternating-Current Systems of 50 Volts to 1000 Volts Not Required to Be Grounded. 250.21(A) General.
250.21(B) Ground Detectors.
250.21(C) Marking.
250.22 Circuits Not to Be Grounded.
250.24 Grounding of Service-Supplied Alternating-Current Systems. 250.24(A) System Grounding Connections.
250.24(A)(1) General.
250.24(A)(2) Outdoor Transformer.
250.24(A)(3) Dual-Fed Services.
250.24(A)(4) Main Bonding Jumper as Wire or Busbar.
250.24(A)(5) Load-Side Grounding Connections.
250.24(B) Main Bonding Jumper. <\/td>\n<\/tr>\n
145<\/td>\n250.24(C) Grounded Conductor Brought to Service Equipment.
250.24(C)(1) Sizing for a Single Raceway or Cable.
250.24(C)(2) Parallel Conductors in Two or More Raceways or Cables.
250.24(C)(3) Delta-Connected Service.
250.24(C)(4) High Impedance.
250.24(D) Grounding Electrode Conductor.
250.24(E) Ungrounded System Grounding Connections.
250.25 Grounding Systems Permitted to Be Connected on the Supply Side of the Disconnect.
250.25(A) Grounded System.
250.25(B) Ungrounded Systems.
250.26 Conductor to Be Grounded \u2014 Alternating-Current Systems.
250.28 Main Bonding Jumper and System Bonding Jumper.
250.28(A) Material.
250.28(B) Construction. <\/td>\n<\/tr>\n
146<\/td>\n250.28(C) Attachment.
250.28(D) Size.
250.28(D)(1) General.
250.28(D)(2) Main Bonding Jumper for Service with More Than One Enclosure.
250.28(D)(3) Separately Derived System with More Than One Enclosure.
250.30 Grounding Separately Derived Alternating-Current Systems.
250.30(A) Grounded Systems.
250.30(A)(1) System Bonding Jumper.
250.30(A)(2) Supply-Side Bonding Jumper.
250.30(A)(3) Grounded Conductor. <\/td>\n<\/tr>\n
147<\/td>\n250.30(A)(4) Grounding Electrode.
250.30(A)(5) Grounding Electrode Conductor, Single Separately Derived System.
250.30(A)(6) Grounding Electrode Conductor, Multiple Separately Derived Systems.
250.30(A)(7) Installation.
250.30(A)(8) Bonding.
250.30(B) Ungrounded Systems.
250.30(B)(1) Grounding Electrode Conductor. <\/td>\n<\/tr>\n
148<\/td>\n250.30(B)(2) Grounding Electrode.
250.30(B)(3) Bonding Path and Conductor.
250.30(C) Outdoor Source.
250.32 Buildings or Structures Supplied by a Feeder(s) or Branch Circuit(s). 250.32(A) Grounding Electrode.
250.32(B) Grounded Systems. 250.32(B)(1) Supplied by a Feeder or Branch Circuit.
250.32(B)(2) Supplied by Separately Derived System.
250.32(C) Ungrounded Systems. 250.32(C)(1) Supplied by a Feeder or Branch Circuit.
250.32(C)(2) Supplied by a Separately Derived System.
250.32(D) Disconnecting Means Located in Separate Building or Structure on the Same Premises. <\/td>\n<\/tr>\n
149<\/td>\n250.32(E) Grounding Electrode Conductor.
250.34 Portable, Vehicle-Mounted, and Trailer-Mounted Generators. 250.34(A) Portable Generators.
250.34(B) Vehicle-Mounted and Trailer-Mounted Generators.
250.34(C) Grounded Conductor Bonding.
250.35 Permanently Installed Generators.
250.35(A) Separately Derived System.
250.35(B) Nonseparately Derived System.
250.36 High-Impedance Grounded Neutral Systems.
250.36(A) Location.
250.36(B) Conductor Insulation and Ampacity.
250.36(C) System Grounding Connection. <\/td>\n<\/tr>\n
150<\/td>\n250.36(D) Conductor Routing.
250.36(E) Equipment Bonding Jumper.
250.36(F) Grounding Electrode Conductor Connection Location.
250.36(G) Equipment Bonding Jumper Size.
Part III. Grounding Electrode System and Grounding Electrode Conductor 250.50 Grounding Electrode System.
250.52 Grounding Electrodes. 250.52(A) Electrodes Permitted for Grounding. 250.52(A)(1) Metal Underground Water Pipe.
250.52(A)(2) Metal In-ground Support Structure(s).
250.52(A)(3) Concrete-Encased Electrode.
250.52(A)(4) Ground Ring.
250.52(A)(5) Rod and Pipe Electrodes.
250.52(A)(6) Other Listed Electrodes.
250.52(A)(7) Plate Electrodes. <\/td>\n<\/tr>\n
151<\/td>\n250.52(A)(8) Other Local Metal Underground Systems or Structures.
250.52(B) Not Permitted for Use as Grounding Electrodes.
250.53 Grounding Electrode System Installation. 250.53(A) Rod, Pipe, and Plate Electrodes.
250.53(A)(1) Below Permanent Moisture Level.
250.53(A)(2) Supplemental Electrode Required.
250.53(A)(3) Supplemental Electrode.
250.53(A)(4) Rod and Pipe Electrodes.
250.53(A)(5) Plate Electrode.
250.53(B) Electrode Spacing.
250.53(C) Bonding Jumper.
250.53(D) Metal Underground Water Pipe.
250.53(D)(1) Continuity.
250.53(D)(2) Supplemental Electrode Required. <\/td>\n<\/tr>\n
152<\/td>\n250.53(E) Supplemental Electrode Bonding Connection Size.
250.53(F) Ground Ring.
250.54 Auxiliary Grounding Electrodes.
250.58 Common Grounding Electrode.
250.60 Use of Strike Termination Devices.
250.62 Grounding Electrode Conductor Material.
250.64 Grounding Electrode Conductor Installation.
250.64(A) Aluminum or Copper-Clad Aluminum Conductors.
250.64(B) Securing and Protection Against Physical Damage.
250.64(B)(1) Not Exposed to Physical Damage.
250.64(B)(2) Exposed to Physical Damage.
250.64(B)(3) Smaller Than 6 AWG.
250.64(B)(4) In Contact with the Earth.
250.64(C) Continuous. <\/td>\n<\/tr>\n
153<\/td>\n250.64(D) Building or Structure with Multiple Disconnecting Means in Separate Enclosures.
250.64(D)(1) Common Grounding Electrode Conductor and Taps.
250.64(D)(2) Individual Grounding Electrode Conductors.
250.64(D)(3) Common Location.
250.64(E) Raceways and Enclosures for Grounding Electrode Conductors. 250.64(E)(1) General.
250.64(E)(2) Methods.
250.64(E)(3) Size.
250.64(E)(4) Wiring Methods.
250.64(F) Installation to Electrode(s).
250.66 Size of Alternating-Current Grounding Electrode Conductor. <\/td>\n<\/tr>\n
154<\/td>\n250.66(A) Connections to a Rod, Pipe, or Plate Electrode(s).
250.66(B) Connections to Concrete-Encased Electrodes.
250.66(C) Connections to Ground Rings.
250.68 Grounding Electrode Conductor and Bonding Jumper Connection to Grounding Electrodes.
250.68(A) Accessibility.
250.68(B) Effective Grounding Path.
250.68(C) Grounding Electrode Conductor Connections. <\/td>\n<\/tr>\n
155<\/td>\n250.70 Methods of Grounding and Bonding Conductor Connection to Electrodes.
Part IV. Enclosure, Raceway, and Service Cable Connections 250.80 Service Raceways and Enclosures.
250.84 Underground Service Cable or Raceway. 250.84(A) Underground Service Cable.
250.84(B) Underground Service Raceway Containing Cable.
250.86 Other Conductor Enclosures and Raceways.
Part V. Bonding 250.90 General.
250.92 Services. 250.92(A) Bonding of Equipment for Services.
250.92(B) Method of Bonding at the Service. <\/td>\n<\/tr>\n
156<\/td>\n250.94 Bonding for Communication Systems.
250.94(A) The Intersystem Bonding Termination Device.
250.94(B) Other Means.
250.96 Bonding Other Enclosures. 250.96(A) General.
250.96(B) Isolated Grounding Circuits.
250.97 Bonding for Over 250 Volts. <\/td>\n<\/tr>\n
157<\/td>\n250.98 Bonding Loosely Jointed Metal Raceways.
250.100 Bonding in Hazardous (Classified) Locations.
250.102 Grounded Conductor, Bonding Conductors, and Jumpers. 250.102(A) Material.
250.102(B) Attachment.
250.102(C) Size \u2014 Supply-Side Bonding Jumper. 250.102(C)(1) Size for Supply Conductors in a Single Raceway or Cable.
250.102(C)(2) Size for Parallel Conductor Installations in Two or More Raceways or Cables. <\/td>\n<\/tr>\n
158<\/td>\n250.102(D) Size \u2014 Equipment Bonding Jumper on Load Side of an Overcurrent Device.
250.102(E) Installation.
250.102(E)(1) Inside a Raceway or an Enclosure.
250.102(E)(2) Outside a Raceway or an Enclosure.
250.102(E)(3) Protection.
250.104 Bonding of Piping Systems and Exposed Structural Metal. 250.104(A) Metal Water Piping.
250.104(A)(1) General.
250.104(A)(2) Buildings of Multiple Occupancy.
250.104(A)(3) Buildings or Structures Supplied by a Feeder(s) or Branch Circuit(s).
250.104(B) Other Metal Piping. <\/td>\n<\/tr>\n
159<\/td>\n250.104(C) Structural Metal.
250.104(D) Separately Derived Systems.
250.104(D)(1) Metal Water Piping System(s).
250.104(D)(2) Structural Metal.
250.104(D)(3) Common Grounding Electrode Conductor.
250.106 Lightning Protection Systems.
Part VI. Equipment Grounding and Equipment Grounding Conductors 250.109 Metal Enclosures.
250.110 Equipment Fastened in Place (Fixed) or Connected by Permanent Wiring Methods. <\/td>\n<\/tr>\n
160<\/td>\n250.112 Specific Equipment Fastened in Place (Fixed) or Connected by Permanent Wiring Methods.
250.112(A) Switchgear and Switchboard Frames and Structures.
250.112(B) Pipe Organs.
250.112(C) Motor Frames.
250.112(D) Enclosures for Motor Controllers.
250.112(E) Elevators and Cranes.
250.112(F) Garages, Theaters, and Motion Picture Studios.
250.112(G) Electric Signs.
250.112(H) Motion Picture Projection Equipment.
250.112(I) Remote-Control, Signaling, and Fire Alarm Circuits.
250.112(J) Luminaires.
250.112(K) Skid-Mounted Equipment.
250.112(L) Motor-Operated Water Pumps.
250.112(M) Metal Well Casings.
250.114 Equipment Connected by Cord and Plug. <\/td>\n<\/tr>\n
161<\/td>\n250.116 Nonelectrical Equipment.
250.118 Types of Equipment Grounding Conductors.
250.119 Identification of Equipment Grounding Conductors. <\/td>\n<\/tr>\n
162<\/td>\n250.119(A) Conductors 4 AWG and Larger.
250.119(B) Multiconductor Cable.
250.119(C) Flexible Cord.
250.120 Equipment Grounding Conductor Installation.
250.120(A) Raceway, Cable Trays, Cable Armor, Cablebus, or Cable Sheaths.
250.120(B) Aluminum and Copper-Clad Aluminum Conductors.
250.120(C) Equipment Grounding Conductors Smaller Than 6 AWG.
250.121 Restricted Use of Equipment Grounding Conductors. 250.121(A) Grounding Electrode Conductor.
250.121(B) Metal Frame of Building or Structure.
250.122 Size of Equipment Grounding Conductors. 250.122(A) General.
250.122(B) Increased in Size. <\/td>\n<\/tr>\n
163<\/td>\n250.122(C) Multiple Circuits.
250.122(D) Motor Circuits.
250.122(D)(1) General.
250.122(D)(2) Instantaneous-Trip Circuit Breaker and Motor Short-Circuit Protector.
250.122(E) Flexible Cord and Fixture Wire.
250.122(F) Conductors in Parallel.
250.122(F)(1) Conductor Installations in Raceways, Auxiliary Gutters, or Cable Trays.
250.122(F)(2) Multiconductor Cables.
250.122(G) Feeder Taps. <\/td>\n<\/tr>\n
164<\/td>\n250.124 Equipment Grounding Conductor Continuity. 250.124(A) Separable Connections.
250.124(B) Switches.
250.126 Identification of Wiring Device Terminals.
Informational Note Figure 250.126 One Example of a Symbol Used to Identify the Grounding Termination Point for an Equipment Grou
250.130(A) For Grounded Systems.
250.130(B) For Ungrounded Systems.
250.130(C) Nongrounding Receptacle Replacement or Branch Circuit Extensions. <\/td>\n<\/tr>\n
165<\/td>\n250.132 Short Sections of Raceway.
250.134 Equipment Fastened in Place or Connected by Permanent Wiring Methods (Fixed).
250.136 Equipment Secured to Grounded Metal Supports.
250.138 Cord-and-Plug-Connected Equipment.
250.138(A) By Means of an Equipment Grounding Conductor.
250.138(B) By Means of a Separate Flexible Wire or Strap.
250.140 Frames of Ranges and Clothes Dryers.
250.142 Use of Grounded Circuit Conductor for Grounding Equipment. 250.142(A) Supply-Side Equipment.
250.142(B) Load-Side Equipment. <\/td>\n<\/tr>\n
166<\/td>\n250.144 Multiple Circuit Connections.
250.146 Connecting Receptacle Grounding Terminal to an Equipment Grounding Conductor.
250.146(A) Surface-Mounted Box.
250.146(B) Contact Devices or Yokes.
250.146(C) Floor Boxes.
250.146(D) Isolated Ground Receptacles.
250.148 Continuity of Equipment Grounding Conductors and Attachment in Boxes.
250.148(A) Connections and Splices.
250.148(B) Equipment Grounding Conductor Continuity.
250.148(C) Metal Boxes.
250.148(D) Nonmetallic Boxes.
Part VIII. Direct-Current Systems 250.160 General.
250.162 Direct-Current Circuits and Systems to Be Grounded.
250.162(A) Two-Wire, Direct-Current Systems. <\/td>\n<\/tr>\n
167<\/td>\n250.162(B) Three-Wire, Direct-Current Systems.
250.164 Point of Connection for Direct-Current Systems. 250.164(A) Off-Premises Source.
250.164(B) On-Premises Source.
250.166 Size of the Direct-Current Grounding Electrode Conductor.
250.166(A) Not Smaller Than the Neutral Conductor.
250.166(B) Not Smaller Than the Largest Conductor.
250.166(C) Connected to Rod, Pipe, or Plate Electrodes.
250.166(D) Connected to a Concrete-Encased Electrode.
250.166(E) Connected to a Ground Ring.
250.167 Direct-Current Ground-Fault Detection. 250.167(A) Ungrounded Systems.
250.167(B) Grounded Systems.
250.167(C) Marking.
250.168 Direct-Current System Bonding Jumper.
250.169 Ungrounded Direct-Current Separately Derived Systems.
Part IX. Instruments, Meters, and Relays <\/td>\n<\/tr>\n
168<\/td>\n250.170 Instrument Transformer Circuits.
250.172 Instrument Transformer Cases.
250.174 Cases of Instruments, Meters, and Relays Operating at 1000 Volts or Less.
250.174(A) Not on Switchgear or Switchboards.
250.174(B) On Switchgear or Dead-Front Switchboards.
250.174(C) On Live-Front Switchboards.
250.176 Cases of Instruments, Meters, and Relays \u2014 Operating at Over 1000 Volts.
250.178 Instrument Equipment Grounding Conductor.
Part X. Grounding of Systems and Circuits of over 1000 Volts 250.180 General.
250.182 Derived Neutral Systems.
250.184 Solidly Grounded Neutral Systems.
250.184(A) Neutral Conductor. 250.184(A)(1) Insulation Level.
250.184(A)(2) Ampacity. <\/td>\n<\/tr>\n
169<\/td>\n250.184(B) Single-Point Grounded Neutral System.
250.184(C) Multigrounded Neutral Systems.
250.186 Grounding Service-Supplied Alternating-Current Systems. 250.186(A) Systems with a Grounded Conductor at the Service Poin
250.186(A)(1) Sizing for a Single Raceway or Overhead Conductor.
250.186(A)(2) Parallel Conductors in Two or More Raceways or Overhead Conductors.
250.186(A)(3) Delta-Connected Service.
250.186(A)(4) Impedance Grounded Neutral Systems.
250.186(B) Systems Without a Grounded Conductor at the Service Point. <\/td>\n<\/tr>\n
170<\/td>\n250.186(B)(1) Sizing for a Single Raceway or Overhead Conductor.
250.186(B)(2) Parallel Conductors in Two or More Raceways or Overhead Conductors.
250.186(B)(3) Impedance Grounded Neutral Systems.
250.187 Impedance Grounded Systems.
250.187(A) Location.
250.187(B) Insulated.
250.187(C) Grounded System Conductor Connection.
250.187(D) Equipment Grounding Conductors.
250.188 Grounding of Systems Supplying Portable or Mobile Equipment.
250.188(A) Portable or Mobile Equipment.
250.188(B) Exposed Non\u2013Current-Carrying Metal Parts.
250.188(C) Ground-Fault Current.
250.188(D) Ground-Fault Detection and Relaying.
250.188(E) Isolation.
250.188(F) Trailing Cable and Couplers.
250.190 Grounding of Equipment. 250.190(A) Equipment Grounding.
250.190(B) Grounding Electrode Conductor. <\/td>\n<\/tr>\n
171<\/td>\n250.190(C) Equipment Grounding Conductor.
250.190(C)(1) General.
250.190(C)(2) Shielded Cables.
250.190(C)(3) Sizing.
250.191 Grounding System at Alternating-Current Substations.
250.194 Grounding and Bonding of Fences and Other Metal Structures.
250.194(A) Metal Fences.
250.194(B) Metal Structures.
Chapter 3 Wiring Methods and Materials
ARTICLE 300 General Requirements for Wiring Methods and Materials Part I. General Requirements 300.1 Scope. 300.1(A) All Wiring
300.1(B) Integral Parts of Equipment.
300.1(C) Metric Designators and Trade Sizes. <\/td>\n<\/tr>\n
172<\/td>\n300.2 Limitations. 300.2(A) Voltage.
300.2(B) Temperature.
300.3 Conductors. 300.3(A) Single Conductors.
300.3(B) Conductors of the Same Circuit.
300.3(B)(1) Paralleled Installations.
300.3(B)(2) Grounding and Bonding Conductors.
300.3(B)(3) Nonferrous Wiring Methods. <\/td>\n<\/tr>\n
173<\/td>\n300.3(B)(4) Column-Width Panelboard Enclosures.
300.3(C) Conductors of Different Systems. 300.3(C)(1) 1000 Volts, Nominal, or Less.
300.3(C)(2) Over 1000 Volts, Nominal.
300.4 Protection Against Physical Damage.
300.4(A) Cables and Raceways Through Wood Members. 300.4(A)(1) Bored Holes.
300.4(A)(2) Notches in Wood.
300.4(B) Nonmetallic-Sheathed Cables and Electrical Nonmetallic Tubing Through Metal Framing Members. 300.4(B)(1) Nonmetallic-Sh
300.4(B)(2) Nonmetallic-Sheathed Cable and Electrical Nonmetallic Tubing.
300.4(C) Cables Through Spaces Behind Panels Designed to Allow Access.
300.4(D) Cables and Raceways Parallel to Framing Members and Furring Strips. <\/td>\n<\/tr>\n
174<\/td>\n300.4(E) Cables, Raceways, or Boxes Installed in or Under Roof Decking.
300.4(F) Cables and Raceways Installed in Shallow Grooves.
300.4(G) Fittings.
300.4(H) Structural Joints.
300.5 Underground Installations. 300.5(A) Minimum Cover Requirements. <\/td>\n<\/tr>\n
175<\/td>\n300.5(B) Wet Locations.
300.5(C) Underground Cables and Conductors Under Buildings.
300.5(D) Protection from Damage.
300.5(D)(1) Emerging from Grade.
300.5(D)(2) Conductors Entering Buildings.
300.5(D)(3) Service Conductors.
300.5(D)(4) Enclosure or Raceway Damage.
300.5(E) Splices and Taps. <\/td>\n<\/tr>\n
176<\/td>\n300.5(F) Backfill.
300.5(G) Raceway Seals.
300.5(H) Bushing.
300.5(I) Conductors of the Same Circuit.
300.5(J) Earth Movement.
300.5(K) Directional Boring.
300.6 Protection Against Corrosion and Deterioration.
300.6(A) Ferrous Metal Equipment.
300.6(A)(1) Protected from Corrosion Solely by Enamel.
300.6(A)(2) Organic Coatings on Boxes or Cabinets.
300.6(A)(3) In Concrete or in Direct Contact with the Earth.
300.6(B) Aluminum Metal Equipment.
300.6(C) Nonmetallic Equipment. <\/td>\n<\/tr>\n
177<\/td>\n300.6(C)(1) Exposed to Sunlight.
300.6(C)(2) Chemical Exposure.
300.6(D) Indoor Wet Locations.
300.7 Raceways Exposed to Different Temperatures. 300.7(A) Sealing.
300.7(B) Expansion, Expansion-Deflection, and Deflection Fittings.
300.8 Installation of Conductors with Other Systems.
300.9 Raceways in Wet Locations Abovegrade.
300.10 Electrical Continuity of Metal Raceways and Enclosures.
300.11 Securing and Supporting. 300.11(A) Secured in Place.
300.11(B) Wiring Systems Installed Above Suspended Ceilings.
300.11(B)(1) Fire-Rated Assemblies.
300.11(B)(2) Non\u2013Fire-Rated Assemblies. <\/td>\n<\/tr>\n
178<\/td>\n300.11(C) Raceways Used as Means of Support.
300.11(D) Cables Not Used as Means of Support.
300.12 Mechanical Continuity \u2014 Raceways and Cables.
300.13 Mechanical and Electrical Continuity \u2014 Conductors. 300.13(A) General.
300.13(B) Device Removal.
300.14 Length of Free Conductors at Outlets, Junctions, and Switch Points.
300.15 Boxes, Conduit Bodies, or Fittings \u2014 Where Required.
300.15(A) Wiring Methods with Interior Access.
300.15(B) Equipment.
300.15(C) Protection.
300.15(D) Type MI Cable.
300.15(E) Integral Enclosure.
300.15(F) Fitting.
300.15(G) Direct-Buried Conductors.
300.15(H) Insulated Devices. <\/td>\n<\/tr>\n
179<\/td>\n300.15(I) Enclosures.
300.15(J) Luminaires.
300.15(K) Embedded.
300.15(L) Manholes and Handhole Enclosures.
300.16 Raceway or Cable to Open or Concealed Wiring. 300.16(A) Box, Conduit Body, or Fitting.
300.16(B) Bushing.
300.17 Number and Size of Conductors in Raceway.
300.18 Raceway Installations. 300.18(A) Complete Runs.
300.18(B) Welding.
300.19 Supporting Conductors in Vertical Raceways. 300.19(A) Spacing Intervals \u2014 Maximum. <\/td>\n<\/tr>\n
180<\/td>\n300.19(B) Fire-Rated Cables and Conductors.
300.19(C) Support Methods.
300.20 Induced Currents in Ferrous Metal Enclosures or Ferrous Metal Raceways. 300.20(A) Conductors Grouped Together.
300.20(B) Individual Conductors.
300.21 Spread of Fire or Products of Combustion.
300.22 Wiring in Ducts Not Used for Air Handling, Fabricated Ducts for Environmental Air, and Other Spaces for Environmental Air
300.22(A) Ducts for Dust, Loose Stock, or Vapor Removal.
300.22(B) Ducts Specifically Fabricated for Environmental Air. <\/td>\n<\/tr>\n
181<\/td>\n300.22(C) Other Spaces Used for Environmental Air (Plenums).
300.22(C)(1) Wiring Methods.
300.22(C)(2) Cable Tray Systems.
300.22(C)(3) Equipment.
300.22(D) Information Technology Equipment.
300.23 Panels Designed to Allow Access.
300.25 Exit Enclosures (Stair Towers).
Part II. Requirements for over 1000 Volts, Nominal 300.31 Covers Required.
300.32 Conductors of Different Systems.
300.34 Conductor Bending Radius.
300.35 Protection Against Induction Heating.
300.37 Aboveground Wiring Methods. <\/td>\n<\/tr>\n
182<\/td>\n300.38 Raceways in Wet Locations Above Grade.
300.39 Braid-Covered Insulated Conductors \u2014 Exposed Installation.
300.40 Insulation Shielding.
300.42 Moisture or Mechanical Protection for Metal-Sheathed Cables.
300.45 Danger Signs.
300.50 Underground Installations. 300.50(A) General.
a b c d <\/td>\n<\/tr>\n
183<\/td>\n300.50(A)(1) Shielded Cables and Nonshielded Cables in Metal-Sheathed Cable Assemblies.
300.50(A)(2) Industrial Establishments.
300.50(A)(3) Other Nonshielded Cables.
300.50(B) Wet Locations.
300.50(C) Protection from Damage.
300.50(D) Splices.
300.50(E) Backfill.
300.50(F) Raceway Seal.
ARTICLE 310 Conductors for General Wiring Part I. General 310.1 Scope.
310.3 Conductors. 310.3(A) Minimum Size of Conductors. <\/td>\n<\/tr>\n
184<\/td>\n310.3(B) Conductor Material.
310.3(C) Stranded Conductors.
310.3(D) Insulated.
Part II. Construction Specifications 310.4 Conductor Constructions and Applications.
1 2 <\/td>\n<\/tr>\n
189<\/td>\n310.6 Conductor Identification. 310.6(A) Grounded Conductors.
310.6(B) Equipment Grounding Conductors.
310.6(C) Ungrounded Conductors.
310.8 Marking. 310.8(A) Required Information.
310.8(B) Method of Marking.
1 2 <\/td>\n<\/tr>\n
190<\/td>\n310.8(B)(1) Surface Marking.
310.8(B)(2) Marker Tape.
310.8(B)(3) Tag Marking.
310.8(B)(4) Optional Marking of Wire Size.
310.8(C) Suffixes to Designate Number of Conductors.
310.8(D) Optional Markings.
Part III. Installation 310.10 Uses Permitted.
310.10(A) Dry Locations.
310.10(B) Dry and Damp Locations.
310.10(C) Wet Locations. <\/td>\n<\/tr>\n
191<\/td>\n310.10(D) Locations Exposed to Direct Sunlight.
310.10(E) Direct-Burial Conductors.
310.10(F) Corrosive Conditions.
310.10(G) Conductors in Parallel. 310.10(G)(1) General.
310.10(G)(2) Conductor and Installation Characteristics.
310.10(G)(3) Separate Cables or Raceways.
310.10(G)(4) Ampacity Adjustment.
310.10(G)(5) Equipment Grounding Conductors.
310.10(G)(6) Bonding Jumpers.
310.12 Single-Phase Dwelling Services and Feeders.
310.12(A) Services. <\/td>\n<\/tr>\n
192<\/td>\n310.12(B) Feeders.
310.12(C) Feeder Ampacities.
310.12(D) Grounded Conductors.
310.14 Ampacities for Conductors Rated 0 Volts \u2013 2000 Volts. 310.14(A) General. 310.14(A)(1) Tables or Engineering Supervision.
310.14(A)(2) Selection of Ampacity.
310.14(A)(3) Temperature Limitation of Conductors. <\/td>\n<\/tr>\n
193<\/td>\n310.14(B) Engineering Supervision.
310.15 Ampacity Tables. 310.15(A) General.
310.15(B) Ambient Temperature Correction Factors. 310.15(B)(1) General. <\/td>\n<\/tr>\n
194<\/td>\n310.15(B)(2) Rooftop. <\/td>\n<\/tr>\n
195<\/td>\n310.15(C) Adjustment Factors. 310.15(C)(1) More than Three Current-Carrying Conductors.
* <\/td>\n<\/tr>\n
196<\/td>\n310.15(C)(2) Raceway Spacing.
310.15(D) Bare or Covered Conductors.
310.15(E) Neutral Conductor.
310.15(F) Grounding or Bonding Conductor.
310.16 Ampacities of Insulated Conductors in Raceway, Cable, or Earth (Directly Buried).
310.17 Ampacities of Single-Insulated Conductors in Free Air.
310.18 Ampacities of Insulated Conductors in Raceway or Cable.
310.19 Ampacities of Single-Insulated Conductors in Free Air.
310.20 Ampacities of Conductors Supported on a Messenger. <\/td>\n<\/tr>\n
197<\/td>\n310.21 Ampacities of Bare or Covered Conductors in Free Air. <\/td>\n<\/tr>\n
202<\/td>\nARTICLE 311 Medium Voltage Conductors and Cable Part I. General 311.1 Scope.
311.2 Definitions.
Electrical Ducts.
Medium Voltage Cable, Type MV.
Thermal Resistivity.
311.6 Listing Requirements.
Part II. Construction Specifications 311.10 Constructions and Applications.
311.10(A) Conductor Application and Insulation.
311.10(B) Thickness of Insulation and Jacket for Nonshielded Insulated Conductors.
311.10(C) Thickness of Insulation for Shielded Insulated Conductors.
311.10(C)(1) 100 Percent Insulation Level.
311.10(C)(2) 133 Percent Insulation Level.
311.10(C)(3) 173 Percent Insulation Level. <\/td>\n<\/tr>\n
204<\/td>\n311.12 Conductors. 311.12(A) Minimum Size of Conductors.
311.12(B) Conductor Material.
311.12(C) Stranded Conductors.
311.14 Conductor Identification.
311.16 Marking. 311.16(A) Required Information.
311.16(B) Method of Marking. <\/td>\n<\/tr>\n
205<\/td>\n311.16(B)(1) Surface Marking.
311.16(B)(2) Marker Tape.
311.16(B)(3) Tag Marking.
311.16(B)(4) Optional Marking of Wire Size.
311.16(C) Optional Markings.
Part III. Installation 311.30 Installation.
311.32 Uses Permitted.
311.36 Direct-Burial Conductors.
311.40 Support.
311.44 Shielding. <\/td>\n<\/tr>\n
206<\/td>\nPart IV. Ampacities 311.60 Ampacities of Conductors. 311.60(A) General. 311.60(A)(1) Tables or Engineering Supervision.
311.60(A)(2) Selection of Ampacity.
311.60(B) Engineering Supervision.
311.60(C) Tables. <\/td>\n<\/tr>\n
223<\/td>\n311.60(D) Ampacity Adjustment. 311.60(D)(1) Grounded Shields.
311.60(D)(2) Burial Depth.
311.60(D)(3) Electrical Ducts Entering Equipment Enclosures.
Figure 311.60(D)(3) Cable Installation Dimensions for Use with Table 311.60(C)(77) Through Table 311.60(C)(86). <\/td>\n<\/tr>\n
224<\/td>\n311.60(D)(4) Ambient Temperature Correction. <\/td>\n<\/tr>\n
225<\/td>\n311.60(E) Ampacity in Air.
311.60(F) Ampacity in Underground Electrical Ducts and Direct Buried in Earth. <\/td>\n<\/tr>\n
226<\/td>\nARTICLE 312 Cabinets, Cutout Boxes, and Meter Socket Enclosures Part I. Scope and Installation 312.1 Scope.
312.2 Damp and Wet Locations.
312.3 Position in Wall.
312.4 Repairing Noncombustible Surfaces.
312.5 Cabinets, Cutout Boxes, and Meter Socket Enclosures.
312.5(A) Openings to Be Closed.
312.5(B) Metal Cabinets, Cutout Boxes, and Meter Socket Enclosures.
312.5(C) Cables.
312.6 Deflection of Conductors.
312.6(A) Width of Wiring Gutters. <\/td>\n<\/tr>\n
227<\/td>\n312.6(B) Wire-Bending Space at Terminals.
312.6(B)(1) Conductors Not Entering or Leaving Opposite Wall.
312.6(B)(2) Conductors Entering or Leaving Opposite Wall. <\/td>\n<\/tr>\n
228<\/td>\n312.6(C) Conductors 4 AWG or Larger. <\/td>\n<\/tr>\n
229<\/td>\n312.7 Space in Enclosures.
312.8 Switch and Overcurrent Device Enclosures.
312.8(A) Splices, Taps, and Feed-Through Conductors.
312.8(B) Power Monitoring or Energy Management Equipment.
312.8(B)(1) Identification.
312.8(B)(2) Area.
312.8(B)(3) Conductors.
312.9 Side or Back Wiring Spaces or Gutters.
Part II. Construction Specifications 312.10 Material.
312.10(A) Metal Cabinets and Cutout Boxes.
312.10(B) Strength.
312.10(C) Nonmetallic Cabinets.
312.11 Spacing.
312.11(A) General.
312.11(A)(1) Base.
312.11(A)(2) Doors. <\/td>\n<\/tr>\n
230<\/td>\n312.11(A)(3) Live Parts.
312.11(B) Switch Clearance.
312.11(C) Wiring Space.
312.11(D) Wiring Space \u2014 Enclosure.
ARTICLE 314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures Part I. Scope and Genera
314.2 Round Boxes.
314.3 Nonmetallic Boxes.
314.4 Metal Boxes.
Part II. Installation 314.15 Damp or Wet Locations.
314.16 Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit Bodies.
314.16(A) Box Volume Calculations. <\/td>\n<\/tr>\n
231<\/td>\n314.16(A)(1) Standard Boxes.
314.16(A)(2) Other Boxes. <\/td>\n<\/tr>\n
232<\/td>\n314.16(B) Box Fill Calculations.
314.16(B)(1) Conductor Fill.
314.16(B)(2) Clamp Fill.
314.16(B)(3) Support Fittings Fill.
314.16(B)(4) Device or Equipment Fill.
314.16(B)(5) Equipment Grounding Conductor Fill.
314.16(C) Conduit Bodies. 314.16(C)(1) General.
314.16(C)(2) With Splices, Taps, or Devices.
314.16(C)(3) Short Radius Conduit Bodies.
314.17 Conductors Entering Boxes, Conduit Bodies, or Fittings.
314.17(A) Openings to Be Closed. 3 3 <\/td>\n<\/tr>\n
233<\/td>\n314.17(B) Boxes and Conduit Bodies.
314.17(B)(1) Conductors Entering Through Individual Holes or Through Flexible Tubing.
314.17(B)(2) Conductors Entering Through Cable Clamps.
314.17(B)(3) Conductors Entering Through Raceways.
314.17(B)(4) Temperature Limitation.
314.17(C) Conductors 4 AWG or Larger.
314.19 Boxes Enclosing Flush Devices or Flush Equipment.
314.20 Flush-Mounted Installations.
314.21 Repairing Noncombustible Surfaces.
314.22 Surface Extensions.
314.23 Supports.
314.23(A) Surface Mounting.
314.23(B) Structural Mounting.
314.23(B)(1) Nails and Screws.
314.23(B)(2) Braces.
314.23(C) Mounting in Finished Surfaces. <\/td>\n<\/tr>\n
234<\/td>\n314.23(D) Suspended Ceilings.
314.23(D)(1) Framing Members.
314.23(D)(2) Support Wires.
314.23(E) Raceway-Supported Enclosure, Without Devices, Luminaires, or Lampholders.
314.23(F) Raceway-Supported Enclosures, with Devices, Luminaires, or Lampholders.
314.23(G) Enclosures in Concrete or Masonry.
314.23(H) Pendant Boxes.
314.23(H)(1) Flexible Cord.
314.23(H)(2) Conduit.
314.24 Depth of Boxes.
314.24(A) Outlet Boxes Without Enclosed Devices or Utilization Equipment. <\/td>\n<\/tr>\n
235<\/td>\n314.24(B) Outlet and Device Boxes with Enclosed Devices or Utilization Equipment.
314.24(B)(1) Large Equipment.
314.24(B)(2) Conductors Larger Than 4 AWG.
314.24(B)(3) Conductors 8, 6, or 4 AWG.
314.24(B)(4) Conductors 12 or 10 AWG.
314.24(B)(5) Conductors 14 AWG and Smaller.
314.25 Covers and Canopies.
314.25(A) Nonmetallic or Metal Covers and Plates.
314.25(B) Exposed Combustible Wall or Ceiling Finish.
314.25(C) Flexible Cord Pendants.
314.27 Outlet Boxes. 314.27(A) Boxes at Luminaire or Lampholder Outlets.
314.27(A)(1) Vertical Surface Outlets.
314.27(A)(2) Ceiling Outlets.
314.27(B) Floor Boxes.
314.27(C) Boxes at Ceiling-Suspended (Paddle) Fan Outlets. <\/td>\n<\/tr>\n
236<\/td>\n314.27(D) Utilization Equipment.
314.27(E) Separable Attachment Fittings.
314.28 Pull and Junction Boxes and Conduit Bodies.
314.28(A) Minimum Size.
314.28(A)(1) Straight Pulls.
314.28(A)(2) Angle or U Pulls, or Splices.
314.28(A)(3) Smaller Dimensions.
314.28(B) Conductors in Pull or Junction Boxes.
314.28(C) Covers.
314.28(D) Permanent Barriers.
314.28(E) Power Distribution Blocks.
314.28(E)(1) Installation.
314.28(E)(2) Size. <\/td>\n<\/tr>\n
237<\/td>\n314.28(E)(3) Wire Bending Space.
314.28(E)(4) Live Parts.
314.28(E)(5) Through Conductors.
314.29 Boxes, Conduit Bodies, and Handhole Enclosures to Be Accessible.
314.29(A) In Buildings and Other Structures.
314.29(B) Underground.
314.30 Handhole Enclosures.
314.30(A) Size.
314.30(B) Wiring Entries.
314.30(C) Enclosed Wiring.
314.30(D) Covers.
Part III. Construction Specifications 314.40 Metal Boxes, Conduit Bodies, and Fittings. 314.40(A) Corrosion Resistant.
314.40(B) Thickness of Metal.
314.40(C) Metal Boxes Over 1650 cm (100 in. ).
314.40(D) Equipment Grounding Conductor Provisions.
314.41 Covers.
314.42 Bushings. <\/td>\n<\/tr>\n
238<\/td>\n314.43 Nonmetallic Boxes.
314.44 Marking.
Part IV. Pull and Junction Boxes, Conduit Bodies, and Handhole Enclosures for Use on Systems over 1000 Volts, Nominal 314.70 Gen
314.70(B) Conduit Bodies.
314.70(C) Handhole Enclosures.
314.71 Size of Pull and Junction Boxes, Conduit Bodies, and Handhole Enclosures.
314.71(A) For Straight Pulls.
314.71(B) For Angle or U Pulls. 314.71(B)(1) Distance to Opposite Wall.
314.71(B)(2) Distance Between Entry and Exit.
314.71(C) Removable Sides.
314.72 Construction and Installation Requirements. 314.72(A) Corrosion Protection.
314.72(B) Passing Through Partitions.
314.72(C) Complete Enclosure. <\/td>\n<\/tr>\n
239<\/td>\n314.72(D) Wiring Is Accessible.
314.72(E) Suitable Covers.
314.72(F) Suitable for Expected Handling.
ARTICLE 320 Armored Cable: Type AC Part I. General 320.1 Scope.
320.2 Definition.
Armored Cable, Type AC.
320.6 Listing Requirements.
Part II. Installation 320.10 Uses Permitted.
320.12 Uses Not Permitted.
320.15 Exposed Work.
320.17 Through or Parallel to Framing Members.
320.23 In Accessible Attics.
320.23(A) Cables Run Across the Top of Floor Joists.
320.23(B) Cable Installed Parallel to Framing Members. <\/td>\n<\/tr>\n
240<\/td>\n320.24 Bending Radius.
320.30 Securing and Supporting. 320.30(A) General.
320.30(B) Securing.
320.30(C) Supporting.
320.30(D) Unsupported Cables.
320.40 Boxes and Fittings.
320.80 Ampacity.
320.80(A) Thermal Insulation.
320.80(B) Cable Tray.
Part III. Construction Specifications 320.100 Construction.
320.104 Conductors.
320.108 Equipment Grounding Conductor.
320.120 Marking.
ARTICLE 322 Flat Cable Assemblies: Type FC Part I. General 322.1 Scope. <\/td>\n<\/tr>\n
241<\/td>\n322.2 Definition.
Flat Cable Assembly, Type FC.
322.6 Listing Requirements.
Part II. Installation 322.10 Uses Permitted.
322.12 Uses Not Permitted.
322.30 Securing and Supporting.
322.40 Boxes and Fittings. 322.40(A) Dead Ends.
322.40(B) Luminaire Hangers.
322.40(C) Fittings.
322.40(D) Extensions.
322.56 Splices and Taps. 322.56(A) Splices.
322.56(B) Taps.
Part III. Construction Specifications 322.100 Construction.
322.104 Conductors.
322.112 Insulation. <\/td>\n<\/tr>\n
242<\/td>\n322.120 Marking. 322.120(A) Temperature Rating.
322.120(B) Identification of Grounded Conductor.
322.120(C) Terminal Block Identification.
ARTICLE 324 Flat Conductor Cable: Type FCC Part I. General 324.1 Scope.
324.2 Definitions.
324.6 Listing Requirements.
Part II. Installation 324.10 Uses Permitted. 324.10(A) Branch Circuits. <\/td>\n<\/tr>\n
243<\/td>\n324.10(B) Branch-Circuit Ratings. 324.10(B)(1) Voltage.
324.10(B)(2) Current.
324.10(C) Floors.
324.10(D) Walls.
324.10(E) Damp Locations.
324.10(F) Heated Floors.
324.10(G) System Height.
324.12 Uses Not Permitted.
324.18 Crossings.
324.30 Securing and Supporting.
324.40 Boxes and Fittings. 324.40(A) Cable Connections and Insulating Ends.
324.40(B) Polarization of Connections.
324.40(C) Shields. 324.40(C)(1) Top Shield.
324.40(C)(2) Bottom Shield.
324.40(D) Connection to Other Systems.
324.40(E) Metal-Shield Connectors.
324.41 Floor Coverings. <\/td>\n<\/tr>\n
244<\/td>\n324.42 Devices. 324.42(A) Receptacles.
324.42(B) Receptacles and Housings.
324.56 Splices and Taps. 324.56(A) FCC Systems Alterations.
324.56(B) Transition Assemblies.
324.60 Grounding and Bonding.
Part III. Construction Specifications 324.100 Construction. 324.100(A) Type FCC Cable.
324.100(B) Shields. 324.100(B)(1) Materials and Dimensions.
324.100(B)(2) Resistivity.
324.101 Corrosion Resistance.
324.112 Insulation.
324.120 Markings. 324.120(A) Cable Marking.
324.120(B) Conductor Identification.
ARTICLE 326 Integrated Gas Spacer Cable: Type IGS Part I. General 326.1 Scope.
326.2 Definition. <\/td>\n<\/tr>\n
245<\/td>\nIntegrated Gas Spacer Cable, Type IGS.
Part II. Installation 326.10 Uses Permitted.
326.12 Uses Not Permitted.
326.24 Bending Radius.
326.26 Bends.
326.40 Fittings.
326.80 Ampacity.
Part III. Construction Specifications 326.104 Conductors. <\/td>\n<\/tr>\n
246<\/td>\n326.112 Insulation.
326.116 Conduit.
326.120 Marking.
ARTICLE 330 Metal-Clad Cable: Type MC Part I. General 330.1 Scope.
330.2 Definition.
330.6 Listing Requirements.
Part II. Installation 330.10 Uses Permitted. 330.10(A) General Uses. <\/td>\n<\/tr>\n
247<\/td>\n330.10(B) Specific Uses.
330.10(B)(1) Cable Tray.
330.10(B)(2) Direct Buried.
330.10(B)(3) Installed as Service-Entrance Cable.
330.10(B)(4) Installed Outside of Buildings or Structures or as Aerial Cable.
330.12 Uses Not Permitted.
330.15 Exposed Work.
330.17 Through or Parallel to Framing Members.
330.23 In Accessible Attics.
330.24 Bending Radius.
330.24(A) Smooth Sheath.
330.24(B) Interlocked-Type Armor or Corrugated Sheath.
330.24(C) Shielded Conductors.
330.30 Securing and Supporting. 330.30(A) General. <\/td>\n<\/tr>\n
248<\/td>\n330.30(B) Securing.
330.30(C) Supporting.
330.30(D) Unsupported Cables.
330.31 Single Conductors.
330.80 Ampacity.
330.80(A) Type MC Cable Installed in Cable Tray.
330.80(B) Single Type MC Conductors Grouped Together.
330.80(C) Thermal Insulation.
Part III. Construction Specifications 330.104 Conductors.
330.108 Equipment Grounding Conductor.
330.112 Insulation.
330.112(A) 1000 Volts or Less.
330.112(B) Over 1000 Volts.
330.116 Sheath. <\/td>\n<\/tr>\n
249<\/td>\n330.130 Hazardous (Classified) Locations.
ARTICLE 332 Mineral-Insulated, Metal-Sheathed Cable: Type MI Part I. General 332.1 Scope.
332.2 Definition.
Mineral-Insulated, Metal-Sheathed Cable, Type MI.
332.6 Listing Requirements.
Part II. Installation 332.10 Uses Permitted.
332.12 Uses Not Permitted.
332.17 Through or Parallel to Framing Members.
332.24 Bending Radius.
332.30 Securing and Supporting.
332.30(A) Horizontal Runs Through Holes and Notches.
332.30(B) Unsupported Cable.
332.30(C) Cable Trays. <\/td>\n<\/tr>\n
250<\/td>\n332.31 Single Conductors.
332.40 Boxes and Fittings. 332.40(A) Fittings.
332.40(B) Terminal Seals.
332.80 Ampacity.
332.80(A) Type MI Cable Installed in Cable Tray.
332.80(B) Single Type MI Conductors Grouped Together.
Part III. Construction Specifications 332.104 Conductors.
332.108 Equipment Grounding Conductor.
332.112 Insulation.
332.116 Sheath.
ARTICLE 334 Nonmetallic-Sheathed Cable: Types NM and NMC Part I. General 334.1 Scope.
334.2 Definitions.
Nonmetallic-Sheathed Cable.
Type NM.
Type NMC.
334.6 Listing Requirements.
Part II. Installation 334.10 Uses Permitted. <\/td>\n<\/tr>\n
251<\/td>\n334.10(A) Type NM.
334.10(B) Type NMC.
334.12 Uses Not Permitted. 334.12(A) Types NM and NMC.
334.12(B) Type NM.
334.15 Exposed Work.
334.15(A) To Follow Surface.
334.15(B) Protection from Physical Damage.
334.15(C) In Unfinished Basements and Crawl Spaces. <\/td>\n<\/tr>\n
252<\/td>\n334.17 Through or Parallel to Framing Members.
334.23 In Accessible Attics.
334.24 Bending Radius.
334.30 Securing and Supporting.
334.30(A) Horizontal Runs Through Holes and Notches.
334.30(B) Unsupported Cables.
334.30(C) Wiring Device Without a Separate Outlet Box.
334.40 Boxes and Fittings. 334.40(A) Boxes of Insulating Material.
334.40(B) Devices of Insulating Material.
334.40(C) Devices with Integral Enclosures.
334.80 Ampacity.
Part III. Construction Specifications 334.100 Construction.
334.104 Conductors.
334.108 Equipment Grounding Conductor. <\/td>\n<\/tr>\n
253<\/td>\n334.112 Insulation.
334.116 Sheath.
334.116(A) Type NM.
334.116(B) Type NMC.
ARTICLE 336 Power and Control Tray Cable: Type TC Part I. General 336.1 Scope.
336.2 Definition.
Power and Control Tray Cable, Type TC.
336.6 Listing Requirements.
Part II. Installation 336.10 Uses Permitted.
336.12 Uses Not Permitted. <\/td>\n<\/tr>\n
254<\/td>\n336.24 Bending Radius.
336.80 Ampacity.
Part III. Construction Specifications 336.100 Construction.
336.104 Conductors.
336.104(A) Fire Alarm Systems.
336.104(B) Thermocouple Circuits.
336.104(C) Class 1 Circuit Conductors.
336.116 Jacket.
336.120 Marking.
336.130 Hazardous (Classified) Location Cable.
ARTICLE 337 Type P Cable Part I. General 337.1 Scope.
337.2 Definition.
Type P. Cable <\/td>\n<\/tr>\n
255<\/td>\n337.6 Listing Requirements.
Part II. Installation 337.10 Uses Permitted.
337.12 Uses Not Permitted.
337.24 Bending Radius.
337.30 Securing and Supporting.
337.31 Single Conductors.
337.80 Ampacity.
Part III. Construction Specifications 337.104 Conductors.
337.108 Equipment Grounding Conductor.
337.112 Insulation.
337.114 Shield.
337.115 Jacket.
337.116 Armor.
337.120 Marking.
ARTICLE 338 Service-Entrance Cable: Types SE and USE Part I. General 338.1 Scope.
338.2 Definitions. <\/td>\n<\/tr>\n
256<\/td>\nService-Entrance Cable.
Type SE.
Type USE.
Service-Entrance Conductor Assembly.
338.6 Listing Requirements.
Part II. Installation 338.10 Uses Permitted. 338.10(A) Service-Entrance Conductors.
338.10(B) Branch Circuits or Feeders. 338.10(B)(1) Grounded Conductor Insulated.
338.10(B)(2) Use of Uninsulated Conductor.
338.10(B)(3) Temperature Limitations.
338.10(B)(4) Installation Methods for Branch Circuits and Feeders.
338.12 Uses Not Permitted. 338.12(A) Service-Entrance Cable.
338.12(B) Underground Service-Entrance Cable. <\/td>\n<\/tr>\n
257<\/td>\n338.24 Bending Radius.
Part III. Construction Specifications 338.100 Construction. 338.100(A) Assemblies.
338.100(B) Uninsulated Conductor.
338.120 Marking.
ARTICLE 340 Underground Feeder and Branch-Circuit Cable: Type UF Part I. General 340.1 Scope.
340.2 Definition.
Underground Feeder and Branch-Circuit Cable, Type UF.
340.6 Listing Requirements.
Part II. Installation 340.10 Uses Permitted.
340.12 Uses Not Permitted. <\/td>\n<\/tr>\n
258<\/td>\n340.24 Bending Radius.
340.80 Ampacity.
Part III. Construction Specifications 340.104 Conductors.
340.108 Equipment Grounding Conductor.
340.112 Insulation.
340.116 Sheath.
ARTICLE 342 Intermediate Metal Conduit: Type IMC Part I. General 342.1 Scope.
342.2 Definition.
Intermediate Metal Conduit (IMC).
342.6 Listing Requirements.
Part II. Installation 342.10 Uses Permitted. 342.10(A) All Atmospheric Conditions and Occupancies.
342.10(B) Corrosion Environments.
342.10(C) Cinder Fill.
342.10(D) Wet Locations.
342.10(E) Severe Physical Damage.
342.14 Dissimilar Metals. <\/td>\n<\/tr>\n
259<\/td>\n342.20 Size. 342.20(A) Minimum.
342.20(B) Maximum.
342.22 Number of Conductors.
342.24 Bends \u2014 How Made.
342.26 Bends \u2014 Number in One Run.
342.28 Reaming and Threading.
342.30 Securing and Supporting.
342.30(A) Securely Fastened.
342.30(B) Supports.
342.42 Couplings and Connectors. 342.42(A) Threadless.
342.42(B) Running Threads.
342.46 Bushings. <\/td>\n<\/tr>\n
260<\/td>\n342.56 Splices and Taps.
342.60 Grounding.
Part III. Construction Specifications 342.100 Construction.
342.120 Marking.
ARTICLE 344 Rigid Metal Conduit: Type RMC Part I. General 344.1 Scope.
344.2 Definition.
Rigid Metal Conduit (RMC).
344.6 Listing Requirements.
Part II. Installation 344.10 Uses Permitted. 344.10(A) Atmospheric Conditions and Occupancies. 344.10(A)(1) Galvanized Steel, St
344.10(A)(2) Aluminum RMC.
344.10(A)(3) Ferrous Raceways and Fittings.
344.10(B) Corrosive Environments. 344.10(B)(1) Galvanized Steel, Stainless Steel, and Red Brass RMC, Elbows, Couplings, and Fitt
344.10(B)(2) Supplementary Protection of Aluminum RMC.
344.10(C) Cinder Fill.
344.10(D) Wet Locations. <\/td>\n<\/tr>\n
261<\/td>\n344.10(E) Severe Physical Damage.
344.14 Dissimilar Metals.
344.20 Size. 344.20(A) Minimum.
344.20(B) Maximum.
344.22 Number of Conductors.
344.24 Bends \u2014 How Made.
344.26 Bends \u2014 Number in One Run.
344.28 Reaming and Threading.
344.30 Securing and Supporting.
344.30(A) Securely Fastened.
344.30(B) Supports. <\/td>\n<\/tr>\n
262<\/td>\n344.42 Couplings and Connectors. 344.42(A) Threadless.
344.42(B) Running Threads.
344.46 Bushings.
344.56 Splices and Taps.
344.60 Grounding.
Part III. Construction Specifications 344.100 Construction.
344.120 Marking.
ARTICLE 348 Flexible Metal Conduit: Type FMC Part I. General 348.1 Scope.
348.2 Definition.
Flexible Metal Conduit (FMC).
348.6 Listing Requirements.
Part II. Installation 348.10 Uses Permitted. <\/td>\n<\/tr>\n
263<\/td>\n348.12 Uses Not Permitted.
348.20 Size. 348.20(A) Minimum.
348.20(B) Maximum.
348.22 Number of Conductors.
348.24 Bends \u2014 How Made.
348.26 Bends \u2014 Number in One Run.
348.28 Trimming.
348.30 Securing and Supporting. * <\/td>\n<\/tr>\n
264<\/td>\n348.30(A) Securely Fastened.
348.30(B) Supports.
348.42 Couplings and Connectors.
348.56 Splices and Taps.
348.60 Grounding and Bonding.
ARTICLE 350 Liquidtight Flexible Metal Conduit: Type LFMC Part I. General 350.1 Scope.
350.2 Definition.
Liquidtight Flexible Metal Conduit (LFMC).
350.6 Listing Requirements.
Part II. Installation 350.10 Uses Permitted.
350.12 Uses Not Permitted. <\/td>\n<\/tr>\n
265<\/td>\n350.20 Size. 350.20(A) Minimum.
350.20(B) Maximum.
350.22 Number of Conductors or Cables. 350.22(A) Metric Designators 16 through 103 (Trade Sizes
through 4).
350.22(B) Metric Designator 12 (Trade Size
350.24 Bends \u2014 How Made.
350.26 Bends \u2014 Number in One Run.
350.28 Trimming.
350.30 Securing and Supporting.
350.30(A) Securely Fastened.
350.30(B) Supports.
350.42 Couplings and Connectors.
350.56 Splices and Taps.
350.60 Grounding and Bonding. <\/td>\n<\/tr>\n
266<\/td>\nPart III. Construction Specifications 350.120 Marking.
ARTICLE 352 Rigid Polyvinyl Chloride Conduit: Type PVC Part I. General 352.1 Scope.
352.2 Definition.
Rigid Polyvinyl Chloride Conduit (PVC).
352.6 Listing Requirements.
Part II. Installation 352.10 Uses Permitted.
352.10(A) Concealed.
352.10(B) Corrosive Influences.
352.10(C) Cinders.
352.10(D) Wet Locations.
352.10(E) Dry and Damp Locations.
352.10(F) Exposed.
352.10(G) Underground Installations.
352.10(H) Support of Conduit Bodies. <\/td>\n<\/tr>\n
267<\/td>\n352.10(I) Insulation Temperature Limitations.
352.12 Uses Not Permitted.
352.12(A) Hazardous (Classified) Locations.
352.12(B) Support of Luminaires.
352.12(C) Physical Damage.
352.12(D) Ambient Temperatures.
352.12(E) Theaters and Similar Locations.
352.20 Size. 352.20(A) Minimum.
352.20(B) Maximum.
352.22 Number of Conductors.
352.24 Bends \u2014 How Made.
352.26 Bends \u2014 Number in One Run.
352.28 Trimming.
352.30 Securing and Supporting.
352.30(A) Securely Fastened.
352.30(B) Supports. <\/td>\n<\/tr>\n
268<\/td>\n352.44 Expansion Fittings.
352.46 Bushings.
352.48 Joints.
352.56 Splices and Taps.
352.60 Grounding. \u20135 \u20135 <\/td>\n<\/tr>\n
269<\/td>\nPart III. Construction Specifications 352.100 Construction.
352.120 Marking.
ARTICLE 353 High Density Polyethylene Conduit: Type HDPE Conduit Part I. General 353.1 Scope.
353.2 Definition.
High Density Polyethylene (HDPE) Conduit.
353.6 Listing Requirements.
Part II. Installation 353.10 Uses Permitted.
353.12 Uses Not Permitted.
353.20 Size. 353.20(A) Minimum. <\/td>\n<\/tr>\n
270<\/td>\n353.20(B) Maximum.
353.22 Number of Conductors.
353.24 Bends \u2014 How Made.
353.26 Bends \u2014 Number in One Run.
353.28 Trimming.
353.46 Bushings.
353.48 Joints.
353.56 Splices and Taps.
353.60 Grounding.
Part III. Construction Specifications 353.100 Construction.
353.120 Marking.
ARTICLE 354 Nonmetallic Underground Conduit with Conductors: Type NUCC Part I. General 354.1 Scope.
354.2 Definition.
Nonmetallic Underground Conduit with Conductors (NUCC).
354.6 Listing Requirements.
Part II. Installation <\/td>\n<\/tr>\n
271<\/td>\n354.10 Uses Permitted.
354.12 Uses Not Permitted.
354.20 Size. 354.20(A) Minimum.
354.20(B) Maximum.
354.22 Number of Conductors.
354.24 Bends \u2014 How Made.
354.26 Bends \u2014 Number in One Run.
354.28 Trimming.
354.46 Bushings. <\/td>\n<\/tr>\n
272<\/td>\n354.48 Joints.
354.50 Conductor Terminations.
354.56 Splices and Taps.
354.60 Grounding.
Part III. Construction Specifications 354.100 Construction. 354.100(A) General.
354.100(B) Nonmetallic Underground Conduit.
354.100(C) Conductors and Cables.
354.100(D) Conductor Fill.
354.120 Marking.
ARTICLE 355 Reinforced Thermosetting Resin Conduit: Type RTRC Part I. General 355.1 Scope.
355.2 Definition.
Reinforced Thermosetting Resin Conduit (RTRC).
355.6 Listing Requirements.
Part II. Installation 355.10 Uses Permitted.
355.10(A) Concealed.
355.10(B) Corrosive Influences. <\/td>\n<\/tr>\n
273<\/td>\n355.10(C) Cinders.
355.10(D) Wet Locations.
355.10(E) Dry and Damp Locations.
355.10(F) Exposed.
355.10(G) Underground Installations.
355.10(H) Support of Conduit Bodies.
355.10(I) Insulation Temperature Limitations.
355.12 Uses Not Permitted.
355.12(A) Hazardous (Classified) Locations.
355.12(B) Support of Luminaires.
355.12(C) Physical Damage.
355.12(D) Ambient Temperatures.
355.12(E) Theaters and Similar Locations.
355.20 Size. 355.20(A) Minimum.
355.20(B) Maximum.
355.22 Number of Conductors.
355.24 Bends \u2014 How Made.
355.26 Bends \u2014 Number in One Run. <\/td>\n<\/tr>\n
274<\/td>\n355.28 Trimming.
355.30 Securing and Supporting.
355.30(A) Securely Fastened.
355.30(B) Supports.
355.44 Expansion Fittings.
\u20135 \u20135 <\/td>\n<\/tr>\n
275<\/td>\n355.46 Bushings.
355.48 Joints.
355.56 Splices and Taps.
355.60 Grounding.
Part III. Construction Specifications 355.100 Construction.
355.120 Marking.
ARTICLE 356 Liquidtight Flexible Nonmetallic Conduit: Type LFNC Part I. General 356.1 Scope.
356.2 Definition.
Liquidtight Flexible Nonmetallic Conduit (LFNC).
356.6 Listing Requirements.
Part II. Installation <\/td>\n<\/tr>\n
276<\/td>\n356.10 Uses Permitted.
356.12 Uses Not Permitted.
356.20 Size. 356.20(A) Minimum.
356.20(B) Maximum.
356.22 Number of Conductors.
356.24 Bends \u2014 How Made.
356.26 Bends \u2014 Number in One Run.
356.28 Trimming.
356.30 Securing and Supporting.
356.42 Couplings and Connectors.
356.56 Splices and Taps. <\/td>\n<\/tr>\n
277<\/td>\n356.60 Grounding.
Part III. Construction Specifications 356.100 Construction.
356.120 Marking.
ARTICLE 358 Electrical Metallic Tubing: Type EMT Part I. General 358.1 Scope.
358.2 Definition.
Electrical Metallic Tubing (EMT).
358.6 Listing Requirements.
Part II. Installation 358.10 Uses Permitted. 358.10(A) Exposed and Concealed.
358.10(B) Corrosive Environments. 358.10(B)(1) Galvanized Steel and Stainless Steel EMT, Elbows, and Fittings.
358.10(B)(2) Supplementary Protection of Aluminum EMT.
358.10(C) Cinder Fill.
358.10(D) Wet Locations.
358.10(E) Physical Damage. <\/td>\n<\/tr>\n
278<\/td>\n358.12 Uses Not Permitted.
358.14 Dissimilar Metals.
358.20 Size. 358.20(A) Minimum.
358.20(B) Maximum.
358.22 Number of Conductors.
358.24 Bends \u2014 How Made.
358.26 Bends \u2014 Number in One Run.
358.28 Reaming and Threading. 358.28(A) Reaming.
358.28(B) Threading.
358.30 Securing and Supporting.
358.30(A) Securely Fastened.
358.30(B) Supports.
358.42 Couplings and Connectors. <\/td>\n<\/tr>\n
279<\/td>\n358.56 Splices and Taps.
358.60 Grounding.
Part III. Construction Specifications 358.100 Construction.
358.120 Marking.
ARTICLE 360 Flexible Metallic Tubing: Type FMT Part I. General 360.1 Scope.
360.2 Definition.
Flexible Metallic Tubing (FMT).
360.6 Listing Requirements.
Part II. Installation 360.10 Uses Permitted.
360.12 Uses Not Permitted.
360.20 Size. 360.20(A) Minimum.
360.20(B) Maximum. <\/td>\n<\/tr>\n
280<\/td>\n360.22 Number of Conductors. 360.22(A) FMT \u2014 Metric Designators 16 and 21 (Trade Sizes
and
360.22(B) FMT \u2014 Metric Designator 12 (Trade Size
360.24 Bends. 360.24(A) Infrequent Flexing Use.
360.24(B) Fixed Bends.
360.56 Splices and Taps.
360.60 Grounding.
Part III. Construction Specifications 360.120 Marking.
ARTICLE 362 Electrical Nonmetallic Tubing: Type ENT <\/td>\n<\/tr>\n
281<\/td>\nPart I. General 362.1 Scope.
362.2 Definition.
Electrical Nonmetallic Tubing (ENT).
362.6 Listing Requirements.
Part II. Installation 362.10 Uses Permitted.
362.12 Uses Not Permitted.
362.20 Size. 362.20(A) Minimum.
362.20(B) Maximum. <\/td>\n<\/tr>\n
282<\/td>\n362.22 Number of Conductors.
362.24 Bends \u2014 How Made.
362.26 Bends \u2014 Number in One Run.
362.28 Trimming.
362.30 Securing and Supporting.
362.30(A) Securely Fastened.
362.30(B) Supports.
362.46 Bushings.
362.48 Joints.
362.56 Splices and Taps.
362.60 Grounding.
Part III. Construction Specifications 362.100 Construction.
362.120 Marking.
ARTICLE 366 Auxiliary Gutters Part I. General 366.1 Scope. <\/td>\n<\/tr>\n
283<\/td>\n366.2 Definitions.
Metal Auxiliary Gutter.
Nonmetallic Auxiliary Gutter.
366.6 Listing Requirements. 366.6(A) Outdoors.
366.6(B) Indoors.
Part II. Installation 366.10 Uses Permitted. 366.10(A) Sheet Metal Auxiliary Gutters. 366.10(A)(1) Indoor and Outdoor Use.
366.10(A)(2) Wet Locations.
366.10(B) Nonmetallic Auxiliary Gutters.
366.10(B)(1) Outdoors.
366.10(B)(2) Indoors.
366.12 Uses Not Permitted.
366.20 Conductors Connected in Parallel.
366.22 Number of Conductors. 366.22(A) Sheet Metal Auxiliary Gutters.
366.22(B) Nonmetallic Auxiliary Gutters. <\/td>\n<\/tr>\n
284<\/td>\n366.23 Ampacity of Conductors. 366.23(A) Sheet Metal Auxiliary Gutters.
366.23(B) Nonmetallic Auxiliary Gutters.
366.30 Securing and Supporting. 366.30(A) Sheet Metal Auxiliary Gutters.
366.30(B) Nonmetallic Auxiliary Gutters.
366.44 Expansion Fittings.
366.56 Splices and Taps.
366.56(A) Within Gutters.
366.56(B) Bare Conductors.
366.56(C) Suitably Identified.
366.56(D) Overcurrent Protection.
366.58 Insulated Conductors. 366.58(A) Deflected Insulated Conductors.
366.58(B) Auxiliary Gutters Used as Pull Boxes.
366.60 Grounding.
Part III. Construction Specifications 366.100 Construction. 366.100(A) Electrical and Mechanical Continuity.
366.100(B) Substantial Construction.
366.100(C) Smooth Rounded Edges.
366.100(D) Covers. <\/td>\n<\/tr>\n
285<\/td>\n366.100(E) Clearance of Bare Live Parts.
366.120 Marking. 366.120(A) Outdoors.
366.120(B) Indoors.
ARTICLE 368 Busways Part I. General Requirements 368.1 Scope.
368.2 Definition.
Busway.
Part II. Installation 368.10 Uses Permitted.
368.10(A) Exposed.
368.10(B) Behind Access Panels.
368.10(C) Through Walls and Floors.
368.10(C)(1) Walls.
368.10(C)(2) Floors.
368.12 Uses Not Permitted. 368.12(A) Physical Damage. <\/td>\n<\/tr>\n
286<\/td>\n368.12(B) Hoistways.
368.12(C) Hazardous Locations.
368.12(D) Wet Locations.
368.12(E) Working Platform.
368.17 Overcurrent Protection.
368.17(A) Rating of Overcurrent Protection \u2014 Feeders.
368.17(B) Reduction in Ampacity Size of Busway.
368.17(C) Feeder or Branch Circuits.
368.17(D) Rating of Overcurrent Protection \u2014 Branch Circuits.
368.30 Support.
368.56 Branches from Busways.
368.56(A) General. <\/td>\n<\/tr>\n
287<\/td>\n368.56(B) Cord and Cable Assemblies.
368.56(C) Branches from Trolley-Type Busways.
368.58 Dead Ends.
368.60 Grounding.
Part III. Construction 368.120 Marking.
Part IV. Requirements for Over 1000 Volts, Nominal 368.214 Adjacent and Supporting Structures.
368.234 Barriers and Seals. 368.234(A) Vapor Seals.
368.234(B) Fire Barriers.
368.236 Drain Facilities.
368.237 Ventilated Bus Enclosures.
368.238 Terminations and Connections.
368.239 Switches.
368.240 Wiring 1000 Volts or Less, Nominal. <\/td>\n<\/tr>\n
288<\/td>\n368.244 Expansion Fittings.
368.258 Neutral Conductor.
368.260 Grounding.
368.320 Marking.
ARTICLE 370 Cablebus Part I. General 370.1 Scope.
370.2 Definition.
Cablebus.
Part II. Installation 370.10 Uses Permitted.
370.12 Uses Not Permitted.
370.18 Cablebus Installation. 370.18(A) Transversely Routed.
370.18(B) Through Dry Floors and Platforms.
370.18(C) Through Floors and Platforms in Wet Locations. <\/td>\n<\/tr>\n
289<\/td>\n370.20 Conductor Size and Termination. 370.20(A) Conductors.
370.20(B) Termination.
370.22 Number of Conductors.
370.23 Overcurrent Protection.
370.30 Securing and Supporting. 370.30(A) Cablebus Supports.
370.30(B) Conductor Supports.
370.42 Fittings.
370.60 Grounding.
370.80 Ampacity of Conductors.
Part III. Construction Specifications 370.120 Marking.
ARTICLE 372 Cellular Concrete Floor Raceways Part I. General 372.1 Scope. <\/td>\n<\/tr>\n
290<\/td>\n372.2 Definitions.
Cell.
Header.
Part II. Installations 372.12 Uses Not Permitted.
372.18 Cellular Concrete Floor Raceways Installation.
372.18(A) Header.
372.18(B) Connection to Cabinets and Other Enclosures.
372.18(C) Junction Boxes.
372.18(D) Inserts.
372.18(E) Markers.
372.20 Size of Conductors.
372.22 Maximum Number of Conductors.
372.23 Ampacity of Conductors.
372.56 Splices and Taps.
372.58 Discontinued Outlets.
ARTICLE 374 Cellular Metal Floor Raceways Part I. General 374.1 Scope. <\/td>\n<\/tr>\n
291<\/td>\n374.2 Definitions.
Cellular Metal Floor Raceway.
Cell.
Header.
374.6 Listing Requirements.
Part II. Installation 374.12 Uses Not Permitted.
374.18 Cellular Metal Floor Raceways Installations.
374.18(A) Connection to Cabinets and Extensions from Cells.
374.18(B) Junction Boxes.
374.18(C) Inserts.
374.18(D) Markers.
374.20 Size of Conductors.
374.22 Maximum Number of Conductors in Raceway.
374.23 Ampacity of Conductors.
374.56 Splices and Taps.
374.58 Discontinued Outlets.
Part III. Construction Specifications 374.100 General. <\/td>\n<\/tr>\n
292<\/td>\nARTICLE 376 Metal Wireways Part I. General 376.1 Scope.
376.2 Definition.
Metal Wireways.
Part II. Installation 376.10 Uses Permitted.
376.12 Uses Not Permitted.
376.20 Conductors Connected in Parallel.
376.21 Size of Conductors.
376.22 Number of Conductors and Ampacity.
376.22(A) Cross-Sectional Areas of Wireway.
376.22(B) Adjustment Factors.
376.23 Insulated Conductors.
376.23(A) Deflected Insulated Conductors.
376.23(B) Metal Wireways Used as Pull Boxes.
376.30 Securing and Supporting.
376.30(A) Horizontal Support. <\/td>\n<\/tr>\n
293<\/td>\n376.30(B) Vertical Support.
376.56 Splices, Taps, and Power Distribution Blocks. 376.56(A) Splices and Taps.
376.56(B) Power Distribution Blocks. 376.56(B)(1) Installation.
376.56(B)(2) Size of Enclosure.
376.56(B)(3) Wire Bending Space.
376.56(B)(4) Live Parts.
376.56(B)(5) Conductors.
376.58 Dead Ends.
376.70 Extensions from Metal Wireways.
Part III. Construction Specifications 376.100 Construction. 376.100(A) Electrical and Mechanical Continuity.
376.100(B) Substantial Construction.
376.100(C) Smooth Rounded Edges.
376.100(D) Covers.
376.120 Marking.
ARTICLE 378 Nonmetallic Wireways Part I. General 378.1 Scope.
378.2 Definition. <\/td>\n<\/tr>\n
294<\/td>\nNonmetallic Wireways.
378.6 Listing Requirements.
Part II. Installation 378.10 Uses Permitted.
378.12 Uses Not Permitted.
378.20 Conductors Connected in Parallel.
378.21 Size of Conductors.
378.22 Number of Conductors.
378.23 Insulated Conductors.
378.23(A) Deflected Insulated Conductors.
378.23(B) Nonmetallic Wireways Used as Pull Boxes.
378.30 Securing and Supporting.
378.30(A) Horizontal Support.
378.30(B) Vertical Support.
378.44 Expansion Fittings.
378.56 Splices and Taps. <\/td>\n<\/tr>\n
295<\/td>\n378.58 Dead Ends.
378.60 Grounding.
378.70 Extensions from Nonmetallic Wireways.
Part III. Construction Specifications 378.120 Marking.
ARTICLE 380 Multioutlet Assembly Part I. General 380.1 Scope.
Part II. Installation 380.10 Uses Permitted.
380.12 Uses Not Permitted.
380.23 Insulated Conductors.
380.23(A) Deflected Insulated Conductors.
380.23(B) Multioutlet Assemblies Used as Pull Boxes.
380.76 Metal Multioutlet Assembly Through Dry Partitions.
ARTICLE 382 Nonmetallic Extensions Part I. General 382.1 Scope.
382.2 Definitions. <\/td>\n<\/tr>\n
296<\/td>\nConcealable Nonmetallic Extension.
Nonmetallic Extension.
382.6 Listing Requirements.
Part II. Installation 382.10 Uses Permitted.
382.10(A) From an Existing Outlet.
382.10(B) Exposed and in a Dry Location.
382.10(C) Residential or Offices.
382.12 Uses Not Permitted.
382.15 Exposed. 382.15(A) Nonmetallic Extensions.
382.15(B) Concealable Nonmetallic Extensions.
382.26 Bends. 382.26(A) Nonmetallic Extensions.
382.26(B) Concealable Nonmetallic Extensions.
382.30 Securing and Supporting. 382.30(A) Nonmetallic Extensions. <\/td>\n<\/tr>\n
297<\/td>\n382.30(B) Concealable Nonmetallic Extensions.
382.40 Boxes and Fittings.
382.42 Devices. 382.42(A) Receptacles.
382.42(B) Receptacles and Housings.
382.56 Splices and Taps.
Part III. Construction Specifications (Concealable Nonmetallic Extensions Only) 382.100 Construction.
382.104 Flat Conductors.
382.104(A) Ungrounded Conductor (Center Layer).
382.104(B) Grounded Conductor (Inner Sectioned Layers).
382.104(C) Equipment Grounding Conductor (Outer Sectioned Layers).
382.112 Insulation.
382.120 Marking. 382.120(A) Cable.
382.120(B) Conductor Identification.
ARTICLE 384 Strut-Type Channel Raceway Part I. General <\/td>\n<\/tr>\n
298<\/td>\n384.1 Scope.
384.2 Definition.
Strut-Type Channel Raceway.
384.6 Listing Requirements.
Part II. Installation 384.10 Uses Permitted.
384.12 Uses Not Permitted.
384.21 Size of Conductors.
384.22 Number of Conductors.
Table 384.22 <\/td>\n<\/tr>\n
299<\/td>\n384.30 Securing and Supporting. 384.30(A) Surface Mount.
384.30(B) Suspension Mount.
384.56 Splices and Taps.
384.60 Grounding.
Part III. Construction Specifications 384.100 Construction.
384.100(A) Material.
384.100(B) Corrosion Protection.
384.100(C) Cover.
384.120 Marking.
ARTICLE 386 Surface Metal Raceways Part I. General 386.1 Scope.
386.2 Definition.
Surface Metal Raceway.
386.6 Listing Requirements.
Part II. Installation 386.10 Uses Permitted. <\/td>\n<\/tr>\n
300<\/td>\n386.12 Uses Not Permitted.
386.21 Size of Conductors.
386.22 Number of Conductors or Cables.
386.30 Securing and Supporting.
386.56 Splices and Taps.
386.60 Grounding.
386.70 Combination Raceways.
Part III. Construction Specifications 386.100 Construction.
386.120 Marking.
ARTICLE 388 Surface Nonmetallic Raceways Part I. General 388.1 Scope.
388.2 Definition. <\/td>\n<\/tr>\n
301<\/td>\nSurface Nonmetallic Raceway.
388.6 Listing Requirements.
Part II. Installation 388.10 Uses Permitted.
388.12 Uses Not Permitted.
388.21 Size of Conductors.
388.22 Number of Conductors or Cables.
388.30 Securing and Supporting.
388.56 Splices and Taps.
388.60 Grounding.
388.70 Combination Raceways.
Part III. Construction Specifications 388.100 Construction.
388.120 Marking.
ARTICLE 390 Underfloor Raceways Part I. General 390.1 Scope. <\/td>\n<\/tr>\n
302<\/td>\n390.2 Definition.
Underfloor Raceway.
Part II. Installation 390.10 Uses Permitted.
390.12 Uses Not Permitted.
390.15 Covering.
390.15(A) Raceways Not over 100 mm (4 in.) Wide.
390.15(B) Raceways over 100 mm (4 in.) Wide But Not over 200 mm (8 in.) Wide.
390.15(C) Trench-Type Raceways Flush with Concrete.
390.15(D) Other Raceways Flush with Concrete.
390.20 Size of Conductors.
390.22 Maximum Number of Conductors in Raceway.
390.23 Ampacity of Conductors.
390.56 Splices and Taps.
390.57 Discontinued Outlets.
390.70 Laid in Straight Lines.
390.71 Markers at Ends.
390.73 Dead Ends.
390.74 Junction Boxes. <\/td>\n<\/tr>\n
303<\/td>\n390.75 Inserts.
390.76 Connections to Cabinets and Wall Outlets.
ARTICLE 392 Cable Trays Part I. General 392.1 Scope.
392.2 Definition.
Cable Tray System.
Part II. Installation 392.10 Uses Permitted.
392.10(A) Wiring Methods. <\/td>\n<\/tr>\n
304<\/td>\n392.10(B) In Industrial Establishments.
392.10(B)(1) Single-Conductor Cables.
392.10(B)(2) Singleand Multiconductor Medium Voltage Cables.
392.10(C) Hazardous (Classified) Locations.
392.10(D) Nonmetallic Cable Tray.
392.10(E) Airfield Lighting Cable Tray.
392.12 Uses Not Permitted.
392.18 Cable Tray Installation. 392.18(A) Complete System.
392.18(B) Completed Before Installation.
392.18(C) Covers.
392.18(D) Through Partitions and Walls. <\/td>\n<\/tr>\n
305<\/td>\n392.18(E) Exposed and Accessible.
392.18(F) Adequate Access.
392.18(G) Raceways, Cables, Boxes, and Conduit Bodies Supported from Cable Tray Systems.
392.18(H) Marking.
392.20 Cable and Conductor Installation. 392.20(A) Multiconductor Cables Operating at 1000 Volts or Less.
392.20(B) Cables Operating at Over 1000 Volts.
392.20(C) Connected in Parallel.
392.20(D) Single Conductors.
392.22 Number of Conductors or Cables. 392.22(A) Number of Multiconductor Cables, Rated 2000 Volts or Less, in Cable Trays.
392.22(A)(1) Ladder or Ventilated Trough Cable Trays Containing Any Mixture of Cables. <\/td>\n<\/tr>\n
306<\/td>\n392.22(A)(2) Ladder or Ventilated Trough Cable Trays Containing Multiconductor Control and\/or Signal Cables Only.
392.22(A)(3) Solid Bottom Cable Trays Containing Any Mixture of Cables.
392.22(A)(4) Solid Bottom Cable Tray Containing Multiconductor Control and\/or Signal Cables Only.
392.22(A)(5) Ventilated Channel Cable Trays Containing Multiconductor Cables of Any Type.
a a 2 2 2 2 2 2 2 2 <\/td>\n<\/tr>\n
307<\/td>\n392.22(A)(6) Solid Channel Cable Trays Containing Multiconductor Cables of Any Type.
392.22(B) Number of Single-Conductor Cables, Rated 2000 Volts or Less, in Cable Trays.
392.22(B)(1) Ladder or Ventilated Trough Cable Trays.
392.22(B)(2) Ventilated Channel Cable Trays. <\/td>\n<\/tr>\n
308<\/td>\n392.22(C) Number of Type MV and Type MC Cables (2001 Volts or Over) in Cable Trays.
392.30 Securing and Supporting. 392.30(A) Cable Trays.
392.30(B) Cables and Conductors.
392.44 Expansion Splice Plates.
392.46 Bushed Conduit and Tubing.
392.46(A) Through Bushed Conduit or Tubing.
392.46(B) Flanged Connections.
392.56 Cable Splices.
392.60 Grounding and Bonding. 392.60(A) Metal Cable Trays. <\/td>\n<\/tr>\n
309<\/td>\n392.60(B) Steel or Aluminum Cable Tray Systems.
392.60(C) Transitions.
392.80 Ampacity of Conductors. 392.80(A) Ampacity of Cables, Rated 2000 Volts or Less, in Cable Trays.
392.80(A)(1) Multiconductor Cables.
* 2 2 2 2 <\/td>\n<\/tr>\n
310<\/td>\n392.80(A)(2) Single-Conductor Cables.
392.80(A)(3) Combinations of Multiconductor and Single-Conductor Cables.
392.80(B) Ampacity of Type MV and Type MC Cables (2001 Volts or Over) in Cable Trays.
392.80(B)(1) Multiconductor Cables (2001 Volts or Over).
392.80(B)(2) Single-Conductor Cables (2001 Volts or Over).
Part III. Construction Specifications 392.100 Construction. 392.100(A) Strength and Rigidity.
392.100(B) Smooth Edges.
392.100(C) Corrosion Protection.
392.100(D) Side Rails.
392.100(E) Fittings.
392.100(F) Nonmetallic Cable Tray. <\/td>\n<\/tr>\n
311<\/td>\nARTICLE 393 Low-Voltage Suspended Ceiling Power Distribution Systems Part I. General 393.1 Scope.
393.2 Definitions.
Busbar.
Busbar Support.
Connector.
Connector, Load.
Connector, Pendant.
Connector, Power Feed.
Connector, Rail to Rail.
Grid Bus Rail.
Low-Voltage Suspended Ceiling Power Distribution System.
Power Supply.
Rail.
Reverse Polarity Protection (Backfeed Protection).
Suspended Ceiling Grid.
393.6 Listing Requirements.
393.6(A) Listed System.
393.6(B) Assembly of Listed Parts. <\/td>\n<\/tr>\n
312<\/td>\nPart II. Installation 393.10 Uses Permitted.
393.12 Uses Not Permitted.
393.14 Installation. 393.14(A) General Requirements.
393.14(B) Insulated Conductors.
393.21 Disconnecting Means. 393.21(A) Location.
393.21(B) Multiwire Branch Circuits.
393.30 Securing and Supporting. 393.30(A) Attached to Building Structure.
393.30(B) Attachment of Power Grid Rails.
393.40 Connectors and Enclosures. 393.40(A) Connectors. <\/td>\n<\/tr>\n
313<\/td>\n393.40(B) Enclosures.
393.45 Overcurrent and Reverse Polarity (Backfeed) Protection. 393.45(A) Overcurrent Protection.
393.45(B) Interconnection of Power Sources.
393.45(C) Reverse Polarity (Backfeed) Protection of Direct-Current Systems.
393.56 Splices.
393.57 Connections.
393.60 Grounding. 393.60(A) Grounding of Supply Side of Class 2 Power Source.
393.60(B) Grounding of Load Side of Class 2 Power Source.
Part III. Construction Specifications 393.104 Sizes and Types of Conductors. 393.104(A) Load Side Utilization Conductor Size.
393.104(B) Power Feed Bus Rail Conductor Size.
ARTICLE 394 Concealed Knob-and-Tube Wiring Part I. General 394.1 Scope.
394.2 Definition.
Concealed Knob-and-Tube Wiring. <\/td>\n<\/tr>\n
314<\/td>\nPart II. Installation 394.10 Uses Permitted.
394.12 Uses Not Permitted.
394.17 Through or Parallel to Framing Members.
394.19 Clearances. 394.19(A) General.
394.19(B) Limited Conductor Space.
394.19(C) Clearance from Piping, Exposed Conductors, and So Forth.
394.23 In Accessible Attics.
394.23(A) Accessible by Stairway or Permanent Ladder.
394.23(B) Not Accessible by Stairway or Permanent Ladder.
394.30 Securing and Supporting. 394.30(A) Supporting.
394.30(B) Securing.
394.42 Devices.
394.56 Splices and Taps. <\/td>\n<\/tr>\n
315<\/td>\nPart III. Construction Specifications 394.104 Conductors.
ARTICLE 396 Messenger-Supported Wiring Part I. General 396.1 Scope.
396.2 Definitions. Insulated Conductor.
Messenger-Supported Wiring.
Part II. Installation 396.10 Uses Permitted. 396.10(A) Cable Types.
396.10(B) In Industrial Establishments. <\/td>\n<\/tr>\n
316<\/td>\n396.10(C) Hazardous (Classified) Locations.
396.12 Uses Not Permitted.
396.30 Messenger. 396.30(A) Support.
396.30(B) Neutral Conductor.
396.30(C) Equipment Grounding Conductor.
396.56 Conductor Splices and Taps.
396.60 Grounding.
ARTICLE 398 Open Wiring on Insulators Part I. General 398.1 Scope.
398.2 Definition.
Open Wiring on Insulators.
Part II. Installation 398.10 Uses Permitted.
398.12 Uses Not Permitted.
398.15 Exposed Work. 398.15(A) Dry Locations.
398.15(B) Entering Spaces Subject to Dampness, Wetness, or Corrosive Vapors. <\/td>\n<\/tr>\n
317<\/td>\n398.15(C) Exposed to Physical Damage.
398.17 Through or Parallel to Framing Members.
398.19 Clearances.
398.23 In Accessible Attics.
398.23(A) Accessible by Stairway or Permanent Ladder.
398.23(B) Not Accessible by Stairway or Permanent Ladder.
398.30 Securing and Supporting. 398.30(A) Conductor Sizes Smaller Than 8 AWG.
398.30(B) Conductor Sizes 8 AWG and Larger.
398.30(C) Industrial Establishments.
398.30(D) Mounting of Conductor Supports.
398.30(E) Tie Wires.
398.42 Devices.
Part III. Construction Specifications <\/td>\n<\/tr>\n
318<\/td>\n398.104 Conductors.
ARTICLE 399 Outdoor Overhead Conductors over 1000 Volts 399.1 Scope.
399.2 Definition.
Outdoor Overhead Conductors.
399.10 Uses Permitted.
399.30 Support. 399.30(A) Conductors.
399.30(B) Structures.
399.30(C) Insulators. <\/td>\n<\/tr>\n
319<\/td>\nChapter 4 Equipment for General Use
ARTICLE 400 Flexible Cords and Flexible Cables Part I. General 400.1 Scope.
400.2 Other Articles.
400.3 Suitability.
400.4 Types. <\/td>\n<\/tr>\n
326<\/td>\n400.5 Ampacities for Flexible Cords and Flexible Cables. 400.5(A) Ampacity Tables. <\/td>\n<\/tr>\n
328<\/td>\n400.5(B) Ultimate Insulation Temperature.
400.5(C) Engineering Supervision.
400.6 Markings. 400.6(A) Standard Markings.
400.6(B) Optional Markings.
400.10 Uses Permitted. 400.10(A) Uses. <\/td>\n<\/tr>\n
329<\/td>\n400.10(B) Attachment Plugs.
400.12 Uses Not Permitted.
400.13 Splices.
400.14 Pull at Joints and Terminals.
400.15 In Show Windows and Showcases.
400.16 Overcurrent Protection.
400.17 Protection from Damage.
Part II. Construction Specifications 400.20 Labels.
400.21 Construction. 400.21(A) Conductors. <\/td>\n<\/tr>\n
330<\/td>\n400.21(B) Nominal Insulation Thickness.
400.22 Grounded-Conductor Identification.
400.22(A) Colored Braid.
400.22(B) Tracer in Braid.
400.22(C) Colored Insulation.
400.22(D) Colored Separator.
400.22(E) Tinned Conductors.
400.22(F) Surface Marking.
400.23 Equipment Grounding Conductor Identification.
400.23(A) Colored Braid.
400.23(B) Colored Insulation or Covering.
400.24 Attachment Plugs.
Part III. Portable Cables Over 600 Volts, Nominal 400.30 Scope.
400.31 Construction. 400.31(A) Conductors.
400.31(B) Equipment Grounding Conductor(s).
400.32 Shielding.
400.33 Equipment Grounding Conductors. <\/td>\n<\/tr>\n
331<\/td>\n400.34 Minimum Bending Radii.
400.35 Fittings.
400.36 Splices and Terminations.
ARTICLE 402 Fixture Wires 402.1 Scope.
402.2 Other Articles.
402.3 Types. <\/td>\n<\/tr>\n
333<\/td>\n402.5 Ampacities for Fixture Wires.
402.6 Minimum Size. <\/td>\n<\/tr>\n
334<\/td>\n402.7 Number of Conductors in Conduit or Tubing.
402.8 Grounded Conductor Identification.
402.9 Marking. 402.9(A) Method of Marking.
402.9(B) Optional Marking.
402.10 Uses Permitted.
402.12 Uses Not Permitted.
402.14 Overcurrent Protection.
ARTICLE 404 Switches Part I. Installation 404.1 Scope.
404.2 Switch Connections. 404.2(A) Three-Way and Four-Way Switches.
404.2(B) Grounded Conductors.
404.2(C) Switches Controlling Lighting Loads.
404.3 Enclosure. <\/td>\n<\/tr>\n
335<\/td>\n404.3(A) General.
404.3(B) Used as a Raceway.
404.4 Damp or Wet Locations. 404.4(A) Surface-Mounted Switch or Circuit Breaker.
404.4(B) Flush-Mounted Switch or Circuit Breaker.
404.4(C) Switches in Tub or Shower Spaces.
404.5 Time Switches, Flashers, and Similar Devices.
404.6 Position and Connection of Switches. 404.6(A) Single-Throw Knife Switches.
404.6(B) Double-Throw Knife Switches.
404.6(C) Connection of Switches.
404.7 Indicating.
404.8 Accessibility and Grouping. 404.8(A) Location.
404.8(B) Voltage Between Adjacent Devices. <\/td>\n<\/tr>\n
336<\/td>\n404.8(C) Multipole Snap Switches.
404.9 General-Use Snap Switches, Dimmers, and Control Switches. 404.9(A) Faceplates.
404.9(B) Grounding.
404.9(C) Construction.
404.10 Mounting of General-Use Snap Switches, Dimmers, and Control Switches. 404.10(A) Surface Type.
404.10(B) Box Mounted.
404.11 Circuit Breakers as Switches.
404.12 Grounding of Enclosures.
404.13 Knife Switches. 404.13(A) Isolating Switches.
404.13(B) To Interrupt Currents.
404.13(C) General-Use Switches. <\/td>\n<\/tr>\n
337<\/td>\n404.13(D) Motor-Circuit Switches.
404.14 Rating and Use of Switches.
404.14(A) Alternating-Current General-Use Snap Switch.
404.14(B) Alternating-Current or Direct-Current General-Use Snap Switch.
404.14(C) CO\/ALR Snap Switches.
404.14(D) Alternating-Current General-Use Snap Switches Rated for 347 Volts.
404.14(E) Dimmer and Electronic Control Switches.
404.14(F) Cordand Plug-Connected Loads.
Part II. Construction Specifications 404.20 Marking. 404.20(A) Ratings.
404.20(B) Off Indication.
404.22 Electronic Control Switches. <\/td>\n<\/tr>\n
338<\/td>\n404.26 Knife Switches Rated 600 to 1000 Volts.
404.27 Fused Switches.
404.28 Wire-Bending Space.
ARTICLE 406 Receptacles, Cord Connectors, and Attachment Plugs (Caps) 406.1 Scope.
406.2 Definitions.
Child Care Facility.
Outlet Box Hood.
406.3 Receptacle Rating and Type. 406.3(A) Receptacles.
406.3(B) Rating.
406.3(C) Receptacles for Aluminum Conductors.
406.3(D) Isolated Ground Receptacles.
406.3(D)(1) Isolated Equipment Grounding Conductor Required.
406.3(D)(2) Installation in Nonmetallic Boxes.
406.3(E) Controlled Receptacle Marking.
Figure 406.3(E) Controlled Receptacle Marking Symbol. <\/td>\n<\/tr>\n
339<\/td>\n406.3(F) Receptacle with USB Charger.
406.4 General Installation Requirements.
406.4(A) Grounding Type.
406.4(B) To Be Grounded.
406.4(C) Methods of Grounding.
406.4(D) Replacements.
406.4(D)(1) Grounding-Type Receptacles.
406.4(D)(2) Non\u2013Grounding-Type Receptacles.
406.4(D)(3) Ground-Fault Circuit-Interrupter Protection.
406.4(D)(4) Arc-Fault Circuit-Interrupter Protection. <\/td>\n<\/tr>\n
340<\/td>\n406.4(D)(5) Tamper-Resistant Receptacles.
406.4(D)(6) Weather-Resistant Receptacles.
406.4(D)(7) Controlled Receptacles.
406.4(E) Cordand Plug-Connected Equipment.
406.4(F) Noninterchangeable Types.
406.5 Receptacle Mounting.
406.5(A) Boxes That Are Set Back.
406.5(B) Boxes That Are Flush.
406.5(C) Receptacles Mounted on Covers.
406.5(D) Position of Receptacle Faces.
406.5(E) Receptacles in Countertops.
406.5(F) Receptacles in Work Surfaces.
406.5(G) Receptacle Orientation. 406.5(G)(1) Countertop and Work Surfaces.
406.5(G)(2) Under Sinks.
406.5(H) Receptacles in Seating Areas and Other Similar Surfaces.
406.5(I) Exposed Terminals.
406.5(J) Voltage Between Adjacent Devices. <\/td>\n<\/tr>\n
341<\/td>\n406.6 Receptacle Faceplates (Cover Plates).
406.6(A) Thickness of Metal Faceplates.
406.6(B) Grounding.
406.6(C) Faceplates of Insulating Material.
406.6(D) Receptacle Faceplate (Cover Plates) with Integral Night Light and\/or USB Charger.
406.7 Attachment Plugs, Cord Connectors, and Flanged Surface Devices.
406.7(A) Construction of Attachment Plugs and Cord Connectors.
406.7(B) Connection of Attachment Plugs.
406.7(C) Attachment Plug Ejector Mechanisms.
406.7(D) Flanged Surface Inlet.
406.8 Noninterchangeability.
406.9 Receptacles in Damp or Wet Locations. 406.9(A) Damp Locations.
406.9(B) Wet Locations. 406.9(B)(1) Receptacles of 15 and 20 Amperes in a Wet Location. <\/td>\n<\/tr>\n
342<\/td>\n406.9(B)(2) Other Receptacles.
406.9(C) Bathtub and Shower Space.
406.9(D) Protection for Floor Receptacles.
406.9(E) Flush Mounting with Faceplate.
406.10 Grounding-Type Receptacles, Adapters, Cord Connectors, and Attachment Plugs. 406.10(A) Grounding Poles (Connections).
406.10(B) Grounding-Pole (Connection) Identification.
Informational Note Figure 406.10(B)(4) One Example of a Symbol Used to Identify the Termination Point for an Equipment Grounding
406.10(D) Grounding-Pole (Connection) Requirements.
406.10(E) Use.
406.11 Connecting Receptacle Grounding Terminal to Box.
406.12 Tamper-Resistant Receptacles. <\/td>\n<\/tr>\n
343<\/td>\n406.13 Single-Pole Separable-Connector Type.
406.13(A) Locking or Latching Type.
406.13(B) Identification.
406.13(C) Interchangeability.
406.13(D) Connecting and Disconnecting.
ARTICLE 408 Switchboards, Switchgear, and Panelboards Part I. General 408.1 Scope.
408.2 Other Articles.
408.3 Support and Arrangement of Busbars and Conductors. 408.3(A) Conductors and Busbars on a Switchboard, Switchgear, or Panelb
408.3(A)(1) Location.
408.3(A)(2) Same Vertical Section. <\/td>\n<\/tr>\n
344<\/td>\n408.3(B) Overheating and Inductive Effects.
408.3(C) Used as Service Equipment.
408.3(D) Terminals.
408.3(E) Bus Arrangement. 408.3(E)(1) AC Phase Arrangement.
408.3(E)(2) DC Bus Arrangement.
408.3(F) Switchboard, Switchgear, or Panelboard Identification.
408.3(F)(1) High-Leg Identification.
408.3(F)(2) Ungrounded AC Systems.
408.3(F)(3) High-Impedance Grounded Neutral AC System.
408.3(F)(4) Ungrounded DC Systems.
408.3(F)(5) Resistively Grounded DC Systems.
408.3(G) Minimum Wire-Bending Space.
408.4 Field Identification Required. 408.4(A) Circuit Directory or Circuit Identification.
408.4(B) Source of Supply. <\/td>\n<\/tr>\n
345<\/td>\n408.5 Clearance for Conductor Entering Bus Enclosures.
408.6 Short-Circuit Current Rating.
408.7 Unused Openings.
408.8 Reconditioning of Equipment.
408.8(A) Panelboards.
408.8(B) Switchboards and Switchgear.
Part II. Switchboards and Switchgear 408.16 Switchboards and Switchgear in Damp or Wet Locations.
408.17 Location Relative to Easily Ignitible Material.
408.18 Clearances. 408.18(A) From Ceiling.
408.18(B) Around Switchboards and Switchgear.
408.18(C) Connections.
408.18(C)(1) Equipment Grounding Conductors.
408.18(C)(2) Grounded Circuit Conductors.
408.18(C)(3) Ungrounded Conductors. <\/td>\n<\/tr>\n
346<\/td>\n408.19 Conductor Insulation.
408.20 Location of Switchboards and Switchgear.
408.22 Grounding of Instruments, Relays, Meters, and Instrument Transformers on Switchboards and Switchgear.
408.23 Power Monitoring and Energy Management Equipment.
Part III. Panelboards 408.30 General.
408.36 Overcurrent Protection.
408.36(A) Snap Switches Rated at 30 Amperes or Less.
408.36(B) Supplied Through a Transformer.
408.36(C) Delta Breakers.
408.36(D) Back-Fed Devices.
408.37 Panelboards in Damp or Wet Locations.
408.38 Enclosure.
408.39 Relative Arrangement of Switches and Fuses.
408.40 Grounding of Panelboards. <\/td>\n<\/tr>\n
347<\/td>\n408.41 Grounded Conductor Terminations.
408.43 Panelboard Orientation.
Part IV. Construction Specifications 408.50 Panels.
408.51 Busbars.
408.52 Protection of Instrument Circuits.
408.53 Component Parts.
408.54 Maximum Number of Overcurrent Devices.
408.55 Wire-Bending Space Within an Enclosure Containing a Panelboard. 408.55(A) Top and Bottom Wire-Bending Space.
408.55(B) Side Wire-Bending Space.
408.55(C) Back Wire-Bending Space.
408.56 Minimum Spacings. <\/td>\n<\/tr>\n
348<\/td>\n408.58 Panelboard Marking.
ARTICLE 409 Industrial Control Panels Part I. General 409.1 Scope.
409.3 Other Articles.
Part II. Installation 409.20 Conductor \u2014 Minimum Size and Ampacity.
409.21 Overcurrent Protection. 409.21(A) General. <\/td>\n<\/tr>\n
349<\/td>\n409.21(B) Location.
409.21(C) Rating.
409.22 Short-Circuit Current Rating. 409.22(A) Installation.
409.22(B) Documentation.
409.30 Disconnecting Means.
409.60 Grounding.
Part III. Construction Specifications 409.100 Enclosures.
409.102 Busbars and Conductors.
409.102(A) Support and Arrangement.
409.102(B) Phase Arrangement.
409.104 Wiring Space. 409.104(A) General.
409.104(B) Wire Bending Space.
409.106 Spacings.
409.108 Service Equipment. <\/td>\n<\/tr>\n
350<\/td>\n409.110 Marking.
ARTICLE 410 Luminaires, Lampholders, and Lamps Part I. General 410.1 Scope.
410.2 Definition.
Clothes Closet Storage Space.
Figure 410.2 Clothes Closet Storage Space. 410.5 Live Parts. <\/td>\n<\/tr>\n
351<\/td>\n410.6 Listing Required.
410.7 Reconditioned Equipment.
410.8 Inspection.
Part II. Luminaire Locations 410.10 Luminaires in Specific Locations. 410.10(A) Wet and Damp Locations.
410.10(B) Corrosive Locations.
410.10(C) In Ducts or Hoods.
410.10(D) Bathtub and Shower Areas.
410.10(D)(1)
410.10(D)(2)
410.10(E) Luminaires in Indoor Sports, Mixed-Use, and All-Purpose Facilities.
410.10(F) Luminaires Installed in or Under Roof Decking.
410.11 Luminaires Near Combustible Material.
410.12 Luminaires over Combustible Material.
410.14 Luminaires in Show Windows.
410.16 Luminaires in Clothes Closets. 410.16(A) Luminaire Types Permitted. <\/td>\n<\/tr>\n
352<\/td>\n410.16(B) Luminaire Types Not Permitted.
410.16(C) Location.
410.18 Space for Cove Lighting.
Part III. Provisions at Luminaire Outlet Boxes, Canopies, and Pans 410.20 Space for Conductors.
410.21 Temperature Limit of Conductors in Outlet Boxes.
410.22 Outlet Boxes to Be Covered.
410.23 Covering of Combustible Material at Outlet Boxes.
410.24 Connection of Electric-Discharge and LED Luminaires. 410.24(A) Independent of the Outlet Box.
410.24(B) Access to Boxes.
Part IV. Luminaire Supports 410.30 Supports. 410.30(A) General.
410.30(B) Metal or Nonmetallic Poles Supporting Luminaires. <\/td>\n<\/tr>\n
353<\/td>\n410.36 Means of Support. 410.36(A) Luminaires Supported By Outlet Boxes.
410.36(B) Suspended Ceilings.
410.36(C) Luminaire Studs.
410.36(D) Insulating Joints.
410.36(E) Raceway Fittings.
410.36(F) Busways.
410.36(G) Trees.
Part V. Grounding 410.40 General.
410.42 Luminaire(s) with Exposed Conductive Parts.
410.44 Methods of Grounding.
410.46 Equipment Grounding Conductor Attachment.
Part VI. Wiring of Luminaires 410.48 Luminaire Wiring \u2014 General.
410.50 Polarization of Luminaires.
410.52 Conductor Insulation. <\/td>\n<\/tr>\n
354<\/td>\n410.54 Pendant Conductors for Incandescent Filament Lamps. 410.54(A) Support.
410.54(B) Size.
410.54(C) Twisted or Cabled.
410.56 Protection of Conductors and Insulation. 410.56(A) Properly Secured.
410.56(B) Protection Through Metal.
410.56(C) Luminaire Stems.
410.56(D) Splices and Taps.
410.56(E) Stranding.
410.56(F) Tension.
410.59 Cord-Connected Showcases.
410.59(A) Cord Requirements.
410.59(B) Receptacles, Connectors, and Attachment Plugs.
410.59(C) Support.
410.59(D) No Other Equipment.
410.59(E) Secondary Circuit(s).
410.62 Cord-Connected Lampholders and Luminaires. 410.62(A) Lampholders. <\/td>\n<\/tr>\n
355<\/td>\n410.62(B) Adjustable Luminaires.
410.62(C) Electric-Discharge and LED Luminaires.
410.62(C)(1) Cord-Connected Installation.
410.62(C)(2) Provided with Mogul-Base, Screw Shell Lampholders.
410.62(C)(3) Equipped with Flanged Surface Inlet.
410.64 Luminaires as Raceways.
410.64(A) Listed.
410.64(B) Through-Wiring.
410.64(C) Luminaires Connected Together.
410.68 Feeder and Branch-Circuit Conductors and Ballasts.
410.69 Identification of Control Conductor Insulation.
410.70 Combustible Shades and Enclosures.
Part VII. Construction of Luminaires 410.74 Luminaire Rating. 410.74(A) Marking.
410.74(B) Electrical Rating. <\/td>\n<\/tr>\n
356<\/td>\n410.82 Portable Luminaires.
410.84 Cord Bushings.
Part VIII. Installation of Lampholders 410.90 Screw Shell Type.
410.93 Double-Pole Switched Lampholders.
410.96 Lampholders in Wet or Damp Locations.
410.97 Lampholders Near Combustible Material.
Part IX. Lamps and Auxiliary Equipment 410.103 Bases, Incandescent Lamps.
410.104 Electric-Discharge Lamp Auxiliary Equipment. 410.104(A) Enclosures.
410.104(B) Switching.
Part X. Special Provisions for Flush and Recessed Luminaires 410.110 General.
410.115 Temperature. 410.115(A) Combustible Material.
410.115(B) Recessed Incandescent Luminaires.
410.116 Clearance and Installation. 410.116(A) Clearance. 410.116(A)(1) Non-Type IC.
410.116(A)(2) Type IC.
410.116(B) Installation. <\/td>\n<\/tr>\n
357<\/td>\n410.116(C) Installation in Fire-Resistant Construction.
410.117 Wiring. 410.117(A) General.
410.117(B) Circuit Conductors.
410.117(C) Tap Conductors.
410.118 Access to Other Boxes.
Part XI. Construction of Flush and Recessed Luminaires 410.119 Temperature.
410.120 Lamp Wattage Marking.
410.121 Solder Prohibited.
410.122 Lampholders.
Part XII. Special Provisions for Electric-Discharge Lighting Systems of 1000 Volts or Less 410.130 General. 410.130(A) Open-Circ
410.130(B) Considered as Energized.
410.130(C) Transformers of the Oil-Filled Type.
410.130(D) Additional Requirements.
410.130(E) Thermal Protection \u2014 Fluorescent Luminaires. 410.130(E)(1) Integral Thermal Protection.
410.130(E)(2) Simple Reactance Ballasts.
410.130(E)(3) Exit Luminaires.
410.130(E)(4) Egress Luminaires. <\/td>\n<\/tr>\n
358<\/td>\n410.130(F) High-Intensity Discharge Luminaires. 410.130(F)(1) Recessed.
410.130(F)(2) Inherently Protected.
410.130(F)(3) Installed in Poured Concrete.
410.130(F)(4) Recessed Remote Ballasts.
410.130(F)(5) Metal Halide Lamp Containment.
410.130(G) Disconnecting Means. 410.130(G)(1) General.
410.130(G)(2) Multiwire Branch Circuits.
410.130(G)(3) Location.
410.134 Direct-Current Equipment.
410.135 Open-Circuit Voltage Exceeding 300 Volts.
410.136 Luminaire Mounting. 410.136(A) Exposed Components.
410.136(B) Combustible Low-Density Cellulose Fiberboard.
410.137 Equipment Not Integral with Luminaire. 410.137(A) Metal Cabinets.
410.137(B) Separate Mounting. <\/td>\n<\/tr>\n
359<\/td>\n410.137(C) Wired Luminaire Sections.
410.138 Autotransformers.
410.139 Switches.
Part XIII. Special Provisions for Electric-Discharge Lighting Systems of More Than 1000 Volts 410.140 General. 410.140(A) Listin
410.140(B) Dwelling Occupancies.
410.140(C) Live Parts.
410.140(D) Additional Requirements.
410.141 Control. 410.141(A) Disconnection.
410.141(B) Within Sight or Locked Type.
410.142 Lamp Terminals and Lampholders.
410.143 Transformers. 410.143(A) Type.
410.143(B) Voltage.
410.143(C) Rating.
410.143(D) Secondary Connections.
410.144 Transformer Locations. 410.144(A) Accessible.
410.144(B) Secondary Conductors.
410.144(C) Adjacent to Combustible Materials.
410.145 Exposure to Damage. <\/td>\n<\/tr>\n
360<\/td>\n410.146 Marking.
Part XIV. Lighting Track 410.151 Installation. 410.151(A) Lighting Track.
410.151(B) Connected Load.
410.151(C) Locations Not Permitted.
410.151(D) Support.
410.153 Heavy-Duty Lighting Track.
410.154 Fastening.
410.155 Construction Requirements. 410.155(A) Construction.
410.155(B) Grounding.
Part XV. Decorative Lighting and Similar Accessories 410.160 Listing of Decorative Lighting.
Part XVI. Special Provisions for Horticultural Lighting Equipment 410.170 General.
410.172 Listing.
410.174 Installation and Use. <\/td>\n<\/tr>\n
361<\/td>\n410.176 Locations Not Permitted. 410.176(A) General Lighting.
410.176(B) Installed Location.
410.178 Flexible Cord.
410.180 Fittings and Connectors.
410.182 Grounding.
410.184 Ground-Fault Circuit-Interrupter Protection.
410.186 Support.
410.188 Hazardous (Classified) Locations.
ARTICLE 411 Low-Voltage Lighting 411.1 Scope.
411.3 Low-Voltage Lighting Systems.
411.4 Listing Required.
411.4(A) Listed System.
411.4(B) Assembly of Listed Parts.
411.5 Specific Location Requirements. 411.5(A) Walls, Floors, and Ceilings. <\/td>\n<\/tr>\n
362<\/td>\n411.5(B) Pools, Spas, Fountains, and Similar Locations.
411.6 Secondary Circuits. 411.6(A) Grounding.
411.6(B) Isolation.
411.6(C) Bare Conductors.
411.7 Branch Circuit.
411.8 Hazardous (Classified) Locations.
ARTICLE 422 Appliances Part I. General 422.1 Scope.
422.3 Other Articles.
422.4 Live Parts.
422.5 Ground-Fault Circuit-Interrupter (GFCI) Protection for Personnel. 422.5(A) General.
422.5(B) Type and Location.
422.6 Listing Required.
Part II. Installation 422.10 Branch Circuits. <\/td>\n<\/tr>\n
363<\/td>\n422.10(A) Individual Branch Circuits.
422.10(B) Branch Circuits Supplying Two or More Loads.
422.11 Overcurrent Protection.
422.11(A) Branch-Circuit Overcurrent Protection.
422.11(B) Household-Type Appliances with Surface Heating Elements.
422.11(C) Infrared Lamp Commercial and Industrial Heating Appliances.
422.11(D) Open-Coil or Exposed Sheathed-Coil Types of Surface Heating Elements in Commercial-Type Heating Appliances.
422.11(E) Single Non\u2013Motor-Operated Appliance.
422.11(F) Electric Heating Appliances Employing Resistance-Type Heating Elements Rated More Than 48 Amperes. 422.11(F)(1) Electr
422.11(F)(2) Commercial Kitchen and Cooking Appliances.
422.11(F)(3) Water Heaters and Steam Boilers. <\/td>\n<\/tr>\n
364<\/td>\n422.11(G) Motor-Operated Appliances.
422.12 Central Heating Equipment.
422.13 Storage-Type Water Heaters.
422.15 Central Vacuum Outlet Assemblies. 422.15(A)
422.15(B)
422.15(C)
422.16 Flexible Cords. 422.16(A) General.
422.16(B) Specific Appliances. 422.16(B)(1) Electrically Operated In-Sink Waste Disposers.
422.16(B)(2) Built-in Dishwashers and Trash Compactors.
422.16(B)(3) Wall-Mounted Ovens and Counter-Mounted Cooking Units. <\/td>\n<\/tr>\n
365<\/td>\n422.16(B)(4) Range Hoods and Microwave Oven\/Range Hood Combinations.
422.17 Protection of Combustible Material.
422.18 Support of Ceiling-Suspended (Paddle) Fans.
422.19 Space for Conductors.
422.20 Outlet Boxes to Be Covered.
422.21 Covering of Combustible Material at Outlet Boxes.
422.22 Utilizing Separable Attachment Fittings.
422.23 Other Installation Methods.
Part III. Disconnecting Means 422.30 General.
422.31 Disconnection of Permanently Connected Appliances. 422.31(A) Rated at Not over 300 Volt-Amperes or
Horsepower.
422.31(B) Appliances Rated over 300 Volt-Amperes.
422.31(C) Motor-Operated Appliances Rated over
Horsepower.
422.33 Disconnection of Cord-and-Plug-Connected or Attachment Fitting\u2013Connected Appliances. 422.33(A) Separable Connector or an <\/td>\n<\/tr>\n
366<\/td>\n422.33(B) Connection at the Rear Base of a Range.
422.33(C) Rating.
422.34 Unit Switch(es) as Disconnecting Means.
422.34(A) Multifamily Dwellings.
422.34(B) Two-Family Dwellings.
422.34(C) One-Family Dwellings.
422.34(D) Other Occupancies.
422.35 Switch and Circuit Breaker to Be Indicating.
Part IV. Construction 422.40 Polarity in Cord-and-Plug-Connected Appliances.
422.41 Cord-and-Plug-Connected Appliances Subject to Immersion.
422.42 Signals for Heated Appliances.
422.43 Flexible Cords. 422.43(A) Heater Cords.
422.43(B) Other Heating Appliances.
422.44 Cord-and-Plug-Connected Immersion Heaters.
422.45 Stands for Cord-and-Plug-Connected Appliances.
422.46 Flatirons.
422.47 Water Heater Controls. <\/td>\n<\/tr>\n
367<\/td>\n422.48 Infrared Lamp Industrial Heating Appliances. 422.48(A) 300 Watts or Less.
422.48(B) Over 300 Watts.
422.50 Cord-and-Plug-Connected Pipe Heating Assemblies.
Part V. Marking 422.60 Nameplate. 422.60(A) Nameplate Marking.
422.60(B) To Be Visible.
422.61 Marking of Heating Elements.
422.62 Appliances Consisting of Motors and Other Loads. 422.62(A) Nameplate Horsepower Markings.
422.62(B) Additional Nameplate Markings.
422.62(B)(1) Marking.
422.62(B)(2) Alternate Marking Method.
ARTICLE 424 Fixed Electric Space-Heating Equipment Part I. General 424.1 Scope.
424.2 Definitions.
Heating Panel. <\/td>\n<\/tr>\n
368<\/td>\nHeating Panel Set.
424.3 Other Articles.
424.4 Branch Circuits. 424.4(A) Branch-Circuit Requirements.
424.4(B) Branch-Circuit Sizing.
424.6 Listed Equipment.
Part II. Installation 424.9 General.
424.10 Special Permission.
424.11 Supply Conductors.
424.12 Locations. 424.12(A) Exposed to Physical Damage.
424.12(B) Damp or Wet Locations.
424.13 Spacing from Combustible Materials.
Part III. Control and Protection of Fixed Electric Space-Heating Equipment 424.19 Disconnecting Means.
424.19(A) Heating Equipment with Supplementary Overcurrent Protection.
424.19(A)(1) Heater Containing No Motor Rated over
Horsepower.
424.19(A)(2) Heater Containing a Motor(s) Rated over
Horsepower. <\/td>\n<\/tr>\n
369<\/td>\n424.19(B) Heating Equipment Without Supplementary Overcurrent Protection. 424.19(B)(1) Without Motor or with Motor Not over
Horsepower.
424.19(B)(2) Over
Horsepower.
424.19(C) Unit Switch(es) as Disconnecting Means.
424.19(C)(1) Multifamily Dwellings.
424.19(C)(2) Two-Family Dwellings.
424.19(C)(3) One-Family Dwellings.
424.19(C)(4) Other Occupancies.
424.20 Thermostatically Controlled Switching Devices. 424.20(A) Serving as Both Controllers and Disconnecting Means.
424.20(B) Thermostats That Do Not Directly Interrupt All Ungrounded Conductors.
424.21 Switch and Circuit Breaker to Be Indicating.
424.22 Overcurrent Protection. 424.22(A) Branch-Circuit Devices.
424.22(B) Resistance Elements.
424.22(C) Overcurrent Protective Devices. <\/td>\n<\/tr>\n
370<\/td>\n424.22(D) Branch-Circuit Conductors.
424.22(E) Conductors for Subdivided Loads.
Part IV. Marking of Heating Equipment 424.28 Nameplate. 424.28(A) Marking Required.
424.28(B) Location.
424.29 Marking of Heating Elements.
Part V. Electric Space-Heating Cables 424.34 Heating Cable Construction.
424.35 Marking of Heating Cables.
424.36 Clearances of Wiring in Ceilings.
424.38 Area Restrictions. 424.38(A) Extending Beyond the Room or Area.
424.38(B) Uses Not Permitted. <\/td>\n<\/tr>\n
371<\/td>\n424.38(C) In Closet Ceilings as Low-Temperature Heat Sources to Control Relative Humidity.
424.39 Clearance from Other Objects and Openings.
424.40 Splices.
424.41 Ceiling Installation of Heating Cables on Dry Board, in Plaster, and on Concrete. 424.41(A) In Walls.
424.41(B) Adjacent Runs.
424.41(C) Surfaces to Be Applied.
424.41(D) Splices.
424.41(E) Ceiling Surface.
424.41(F) Secured.
424.41(G) Dry Board Installations.
424.41(H) Free from Contact with Conductive Surfaces.
424.41(I) Joists.
424.41(J) Crossing Joists.
424.42 Finished Ceilings.
424.43 Installation of Nonheating Leads of Cables. 424.43(A) Free Nonheating Leads.
424.43(B) Leads in Junction Box.
424.43(C) Excess Leads. <\/td>\n<\/tr>\n
372<\/td>\n424.44 Installation of Cables in Concrete or Poured Masonry Floors. 424.44(A) Adjacent Runs.
424.44(B) Secured in Place.
424.44(C) Leads Protected.
424.44(D) Bushings or Approved Fittings.
424.44(E) Ground-Fault Circuit-Interrupter Protection.
424.45 Installation of Cables Under Floor Coverings. 424.45(A) Identification.
424.45(B) Expansion Joints.
424.45(C) Connection to Conductors.
424.45(D) Anchoring.
424.45(E) Ground-Fault Circuit-Interrupter Protection.
424.45(F) Grounding Braid or Sheath.
424.46 Inspection.
424.47 Label Provided by Manufacturer.
Part VI. Duct Heaters 424.57 General.
424.58 Identification.
424.59 Airflow.
424.60 Elevated Inlet Temperature.
424.61 Installation of Duct Heaters with Heat Pumps and Air Conditioners.
424.62 Condensation. <\/td>\n<\/tr>\n
373<\/td>\n424.63 Fan Circuit Interlock.
424.64 Limit Controls.
424.65 Location of Disconnecting Means.
424.66 Installation.
Part VII. Resistance-Type Boilers 424.70 Scope.
424.71 Identification.
424.72 Overcurrent Protection. 424.72(A) Boiler Employing Resistance-Type Immersion Heating Elements in an ASME-Rated and Stampe
424.72(B) Boiler Employing Resistance-Type Heating Elements Rated More Than 48 Amperes and Not Contained in an ASME-Rated and St
424.72(C) Supplementary Overcurrent Protective Devices.
424.72(D) Conductors Supplying Supplementary Overcurrent Protective Devices.
424.72(E) Conductors for Subdivided Loads. <\/td>\n<\/tr>\n
374<\/td>\n424.73 Overtemperature Limit Control.
424.74 Overpressure Limit Control.
Part VIII. Electrode-Type Boilers 424.80 Scope.
424.81 Identification.
424.82 Branch-Circuit Requirements.
424.83 Overtemperature Limit Control.
424.84 Overpressure Limit Control.
424.85 Grounding.
424.86 Markings.
Part IX. Electric Radiant Heating Panels and Heating Panel Sets 424.90 Scope.
424.92 Markings. 424.92(A) Location.
424.92(B) Identified as Suitable. <\/td>\n<\/tr>\n
375<\/td>\n424.92(C) Required Markings.
424.93 Installation. 424.93(A) General. 424.93(A)(1) Manufacturer’s Instructions.
424.93(A)(2) Locations Not Permitted.
424.93(A)(3) Separation from Outlets for Luminaires.
424.93(A)(4) Surfaces Covering Heating Panels.
424.93(A)(5) Surface Coverings.
424.93(B) Heating Panel Sets. 424.93(B)(1) Mounting Location.
424.93(B)(2) Parallel to Joists or Nailing Strips.
424.93(B)(3) Installation of Nails, Staples, or Other Fasteners.
424.93(B)(4) Installed as Complete Unit.
424.94 Clearances of Wiring in Ceilings.
424.95 Location of Branch-Circuit and Feeder Wiring in Walls. 424.95(A) Exterior Walls.
424.95(B) Interior Walls.
424.96 Connection to Branch-Circuit Conductors. 424.96(A) General.
424.96(B) Heating Panels.
424.96(C) Heating Panel Sets. 424.96(C)(1) Connection to Branch-Circuit Wiring. <\/td>\n<\/tr>\n
376<\/td>\n424.96(C)(2) Panel Sets with Terminal Junction Assembly.
424.97 Nonheating Leads.
424.98 Installation in Concrete or Poured Masonry. 424.98(A) Secured in Place and Identified as Suitable.
424.98(B) Expansion Joints.
424.98(C) Spacings.
424.98(D) Protection of Leads.
424.98(E) Bushings or Fittings Required.
424.99 Installation Under Floor Covering. 424.99(A) Identification.
424.99(B) Installation.
424.99(B)(1) Expansion Joints.
424.99(B)(2) Connection to Conductors.
424.99(B)(3) Anchoring.
424.99(B)(4) Coverings.
424.99(B)(5) GFCI Protection.
424.99(B)(6) Grounding Braid or Sheath.
Part X. Low-Voltage Fixed Electric Space-Heating Equipment 424.100 Scope.
424.101 Energy Source. 424.101(A) Power Unit.
424.101(B) Alternate Energy Sources.
424.102 Listed Equipment. <\/td>\n<\/tr>\n
377<\/td>\n424.103 Installation. 424.103(A) General.
424.103(B) Ground.
424.103(C) Ground-Fault Protection.
424.104 Branch Circuit. 424.104(A)
424.104(B)
ARTICLE 425 Fixed Resistance and Electrode Industrial Process Heating Equipment Part I. General 425.1 Scope.
425.2 Other Articles.
425.4 Branch Circuits. 425.4(A) Branch-Circuit Requirements.
425.4(B) Branch-Circuit Sizing.
425.6 Listed Equipment.
Part II. Installation 425.8 General. 425.8(A) Location.
425.8(B) Working Space.
425.8(C) Above Grade Level, Floor, or Work Platform. <\/td>\n<\/tr>\n
378<\/td>\n425.10 Special Permission.
425.11 Supply Conductors.
425.12 Locations. 425.12(A) Exposed to Physical Damage.
425.12(B) Damp or Wet Locations.
425.13 Spacing from Combustible Materials.
425.14 Infrared Lamp Industrial Heating Equipment.
Part III. Control and Protection of Fixed Industrial Process Heating Equipment 425.19 Disconnecting Means.
425.19(A) Heating Equipment with Supplementary Overcurrent Protection.
425.19(A)(1) Heater Containing No Motor Rated over
Horsepower.
425.19(A)(2) Heater Containing a Motor(s) Rated over
Horsepower.
425.19(B) Heating Equipment Without Supplementary Overcurrent Protection. 425.19(B)(1) Without Motor or with Motor Not over
Horsepower.
425.19(B)(2) Over
Horsepower.
425.19(C) Unit Switch(es) as Disconnecting Means.
425.21 Switch and Circuit Breaker to Be Indicating. <\/td>\n<\/tr>\n
379<\/td>\n425.22 425.22(A) Branch-Circuit Devices.
425.22(B) Resistance Elements.
425.22(C) Overcurrent Protective Devices.
425.22(D) Supplying Supplementary Overcurrent Protective Devices.
425.22(E) Conductors for Subdivided Loads.
Part IV. Marking of Heating Equipment 425.28 Nameplate. 425.28(A) Marking Required.
425.28(B) Location.
425.29 Marking of Heating Elements.
425.45 Concealed Fixed Industrial Heating Equipment \u2014 Inspection.
Part V. Fixed Industrial Process Duct Heaters <\/td>\n<\/tr>\n
380<\/td>\n425.57 General.
425.58 Identification.
425.59 Airflow.
425.60 Elevated Inlet Temperature.
425.63 Fan Circuit Interlock.
425.64 Limit Controls.
425.65 Location of Disconnecting Means.
Part VI. Fixed Industrial Process Resistance-Type Boilers 425.70 Scope.
425.71 Identification.
425.72 Overcurrent Protection. 425.72(A) Boiler Employing Resistance-Type Immersion Heating Elements in an ASME-Rated and Stampe
425.72(B) Boiler Employing Resistance-Type Heating Elements Rated More Than 48 Amperes and Not Contained in an ASME-Rated and St
425.72(C) Supplementary Overcurrent Protective Devices.
425.72(D) Suitable for Branch-Circuit Protection.
425.72(E) Conductors Supplying Supplementary Overcurrent Protective Devices.
425.72(F) Conductors for Subdivided Loads. <\/td>\n<\/tr>\n
381<\/td>\n425.73 Overtemperature Limit Control.
425.74 Overpressure Limit Control.
Part VII. Fixed Industrial Process Electrode-Type Boilers 425.80 Scope.
425.81 Identification.
425.82 Branch-Circuit Requirements.
425.83 Overtemperature Limit Control.
425.84 Overpressure Limit Control.
425.85 Grounding.
425.86 Markings.
ARTICLE 426 Fixed Outdoor Electric Deicing and Snow-Melting Equipment Part I. General 426.1 Scope.
426.1(A) Embedded.
426.1(B) Exposed. <\/td>\n<\/tr>\n
382<\/td>\n426.2 Definitions.
Heating System.
Impedance Heating System.
Resistance Heating Element.
Skin-Effect Heating System.
426.3 Application of Other Articles.
426.4 Continuous Load.
Part II. Installation 426.10 General.
426.11 Use.
426.12 Thermal Protection.
426.13 Identification.
426.14 Special Permission.
Part III. Resistance Heating Elements 426.20 Embedded Deicing and Snow-Melting Equipment. 426.20(A) Watt Density.
426.20(B) Spacing.
426.20(C) Cover.
426.20(D) Secured.
426.20(E) Expansion and Contraction. <\/td>\n<\/tr>\n
383<\/td>\n426.21 Exposed Deicing and Snow-Melting Equipment. 426.21(A) Secured.
426.21(B) Overtemperature.
426.21(C) Expansion and Contraction.
426.21(D) Flexural Capability.
426.22 Installation of Nonheating Leads for Embedded Equipment. 426.22(A) Grounding Sheath or Braid.
426.22(B) Splice Connections.
426.22(C) Bushings.
426.22(D) Expansion and Contraction.
426.22(E) Emerging from Grade.
426.22(F) Leads in Junction Boxes.
426.23 Installation of Nonheating Leads for Exposed Equipment. 426.23(A) Nonheating Leads.
426.23(B) Protection.
426.24 Electrical Connection. 426.24(A) Heating Element Connections.
426.24(B) Circuit Connections.
426.25 Marking.
426.26 Corrosion Protection.
426.27 Grounding Braid or Sheath.
426.28 Ground-Fault Protection of Equipment. <\/td>\n<\/tr>\n
384<\/td>\nPart IV. Impedance Heating 426.30 Personnel Protection.
426.31 Isolation Transformer.
426.32 Voltage Limitations.
426.33 Induced Currents.
Part V. Skin-Effect Heating 426.40 Conductor Ampacity.
426.41 Pull Boxes.
426.42 Single Conductor in Enclosure.
426.43 Corrosion Protection.
426.44 Equipment Grounding Conductor.
Part VI. Control and Protection 426.50 Disconnecting Means. 426.50(A) Disconnection.
426.50(B) Cord-and-Plug-Connected Equipment.
426.51 Controllers. 426.51(A) Temperature Controller with \u201cOff\u201d Position.
426.51(B) Temperature Controller Without \u201cOff\u201d Position.
426.51(C) Remote Temperature Controller.
426.51(D) Combined Switching Devices.
426.54 Cord-and-Plug-Connected Deicing and Snow-Melting Equipment. <\/td>\n<\/tr>\n
385<\/td>\nARTICLE 427 Fixed Electric Heating Equipment for Pipelines and Vessels Part I. General 427.1 Scope.
427.2 Definitions.
Impedance Heating System.
Induction Heating System.
Pipeline.
Resistance Heating Element.
Skin-Effect Heating System.
Vessel.
427.3 Application of Other Articles.
427.4 Continuous Load.
Part II. Installation 427.10 General.
427.11 Use.
427.12 Thermal Protection.
427.13 Identification.
Part III. Resistance Heating Elements 427.14 Secured.
427.15 Not in Direct Contact. <\/td>\n<\/tr>\n
386<\/td>\n427.16 Expansion and Contraction.
427.17 Flexural Capability.
427.18 Power Supply Leads. 427.18(A) Nonheating Leads.
427.18(B) Power Supply Leads Protection.
427.18(C) Interconnecting Leads.
427.19 Electrical Connections. 427.19(A) Nonheating Interconnections.
427.19(B) Circuit Connections.
427.20 Marking.
427.22 Ground-Fault Protection of Equipment.
427.23 Grounded Conductive Covering.
427.23(A) Heating Wires or Cables.
427.23(B) Heating Panels.
Part IV. Impedance Heating 427.25 Personnel Protection.
427.26 Isolation Transformer.
427.27 Voltage Limitations. <\/td>\n<\/tr>\n
387<\/td>\n427.28 Induced Currents.
427.29 Grounding.
427.30 Secondary Conductor Sizing.
Part V. Induction Heating 427.35 Scope.
427.36 Personnel Protection.
427.37 Induced Current.
Part VI. Skin-Effect Heating 427.45 Conductor Ampacity.
427.46 Pull Boxes.
427.47 Single Conductor in Enclosure.
427.48 Grounding.
Part VII. Control and Protection 427.55 Disconnecting Means. 427.55(A) Switch or Circuit Breaker.
427.55(B) Cord-and-Plug-Connected Equipment.
427.56 Controls. 427.56(A) Temperature Control with \u201cOff\u201d Position.
427.56(B) Temperature Control Without \u201cOff\u201d Position.
427.56(C) Remote Temperature Controller. <\/td>\n<\/tr>\n
388<\/td>\n427.56(D) Combined Switching Devices.
427.57 Overcurrent Protection.
ARTICLE 430 Motors, Motor Circuits, and Controllers Part I. General 430.1 Scope.
Figure 430.1 Article 430 Contents. <\/td>\n<\/tr>\n
389<\/td>\n430.2 Definitions.
Controller.
Electronically Protected (as applied to motors).
Part-Winding Motors. <\/td>\n<\/tr>\n
390<\/td>\nSystem Isolation Equipment.
Valve Actuator Motor (VAM) Assemblies.
430.4 Part-Winding Motors.
430.5 Other Articles.
430.6 Ampacity and Motor Rating Determination.
430.6(A) General Motor Applications.
430.6(A)(1) Table Values. <\/td>\n<\/tr>\n
391<\/td>\n430.6(A)(2) Nameplate Values.
430.6(B) Torque Motors.
430.6(C) Alternating-Current Adjustable Voltage Motors.
430.6(D) Valve Actuator Motor Assemblies.
430.7 Marking on Motors and Multimotor Equipment. 430.7(A) Usual Motor Applications.
430.7(B) Locked-Rotor Indicating Code Letters. <\/td>\n<\/tr>\n
392<\/td>\n430.7(B)(1) Multispeed Motors.
430.7(B)(2) Single-Speed Motors.
430.7(B)(3) Dual-Voltage Motors.
430.7(B)(4) 50\/60 Hz Motors.
430.7(B)(5) Part-Winding Motors.
430.7(C) Torque Motors.
430.7(D) Multimotor and Combination-Load Equipment. 430.7(D)(1) Factory-Wired.
430.7(D)(2) Not Factory-Wired.
430.8 Marking on Controllers. <\/td>\n<\/tr>\n
393<\/td>\n430.9 Terminals. 430.9(A) Markings.
430.9(B) Conductors.
430.9(C) Torque Requirements.
430.10 Wiring Space in Enclosures. 430.10(A) General.
430.10(B) Wire-Bending Space in Enclosures.
* <\/td>\n<\/tr>\n
394<\/td>\n430.11 Protection Against Liquids.
430.12 Motor Terminal Housings. 430.12(A) Material.
430.12(B) Dimensions and Space \u2014 Wire-to-Wire Connections.
3 3
3 3 3 3 <\/td>\n<\/tr>\n
395<\/td>\n430.12(C) Dimensions and Space \u2014 Fixed Terminal Connections.
430.12(D) Large Wire or Factory Connections.
430.12(E) Equipment Grounding Connections.
430.13 Bushing.
430.14 Location of Motors. 430.14(A) Ventilation and Maintenance.
3 3 <\/td>\n<\/tr>\n
396<\/td>\n430.14(B) Open Motors.
430.16 Exposure to Dust Accumulations.
430.17 Highest Rated or Smallest Rated Motor.
430.18 Nominal Voltage of Rectifier Systems.
Part II. Motor Circuit Conductors 430.21 General.
430.22 Single Motor.
430.22(A) Direct-Current Motor-Rectifier Supplied.
430.22(B) Multispeed Motor.
430.22(C) Wye-Start, Delta-Run Motor.
430.22(D) Part-Winding Motor.
430.22(E) Other Than Continuous Duty. <\/td>\n<\/tr>\n
397<\/td>\n430.22(F) Separate Terminal Enclosure.
430.22(G) Conductors for Small Motors.
430.22(G)(1) 18 AWG Copper.
430.22(G)(2) 16 AWG Copper.
430.23 Wound-Rotor Secondary. 430.23(A) Continuous Duty.
430.23(B) Other Than Continuous Duty.
430.23(C) Resistor Separate from Controller. <\/td>\n<\/tr>\n
398<\/td>\n430.24 Several Motors or a Motor(s) and Other Load(s).
430.25 Multimotor and Combination-Load Equipment.
430.26 Feeder Demand Factor.
430.27 Capacitors with Motors.
430.28 Feeder Taps.
430.29 Constant Voltage Direct-Current Motors \u2014 Power Resistors. <\/td>\n<\/tr>\n
399<\/td>\nPart III. Motor and Branch-Circuit Overload Protection 430.31 General.
430.32 Continuous-Duty Motors. 430.32(A) More Than 1 Horsepower.
430.32(A)(1) Separate Overload Device.
430.32(A)(2) Thermal Protector or Electronically Protected.
430.32(A)(3) Integral with Motor. <\/td>\n<\/tr>\n
400<\/td>\n430.32(A)(4) Larger Than 1500 Horsepower.
430.32(B) One Horsepower or Less, Automatically Started.
430.32(B)(1) Separate Overload Device.
430.32(B)(2) Thermal Protector or Electronically Protected.
430.32(B)(3) Integral with Motor.
430.32(B)(4) Impedance-Protected.
430.32(C) Selection of Overload Device.
430.32(D) One Horsepower or Less, Nonautomatically Started. 430.32(D)(1) Permanently Installed.
430.32(D)(2) Not Permanently Installed.
430.32(E) Wound-Rotor Secondaries.
430.33 Intermittent and Similar Duty.
430.35 Shunting During Starting Period. 430.35(A) Nonautomatically Started. <\/td>\n<\/tr>\n
401<\/td>\n430.35(B) Automatically Started.
430.36 Fuses \u2014 In Which Conductor.
430.37 Devices Other Than Fuses \u2014 In Which Conductor.
430.38 Number of Conductors Opened by Overload Device.
430.39 Motor Controller as Overload Protection.
430.40 Overload Relays.
430.42 Motors on General-Purpose Branch Circuits.
430.42(A) Not over 1 Horsepower.
430.42(B) Over 1 Horsepower.
430.42(C) Cord-and Plug-Connected. <\/td>\n<\/tr>\n
402<\/td>\n430.42(D) Time Delay.
430.43 Automatic Restarting.
430.44 Orderly Shutdown.
Part IV. Motor Branch-Circuit Short-Circuit and Ground-Fault Protection 430.51 General.
430.52 Rating or Setting for Individual Motor Circuit. 430.52(A) General.
430.52(B) All Motors.
430.52(C) Rating or Setting. 430.52(C)(1) In Accordance with Table 430.52.
1 1 2 <\/td>\n<\/tr>\n
403<\/td>\n430.52(C)(2) Overload Relay Table.
430.52(C)(3) Instantaneous Trip Circuit Breaker.
430.52(C)(4) Multispeed Motor.
430.52(C)(5) Power Electronic Devices.
430.52(C)(6) Self-Protected Combination Controller.
430.52(C)(7) Motor Short-Circuit Protector.
430.52(D) Torque Motors.
430.53 Several Motors or Loads on One Branch Circuit. <\/td>\n<\/tr>\n
404<\/td>\n430.53(A) Not Over 1 Horsepower.
430.53(B) If Smallest Rated Motor Protected.
430.53(C) Other Group Installations.
430.53(D) Single Motor Taps.
430.54 Multimotor and Combination-Load Equipment.
430.55 Combined Overcurrent Protection.
430.56 Branch-Circuit Protective Devices \u2014 In Which Conductor.
430.57 Size of Fuseholder.
430.58 Rating of Circuit Breaker.
Part V. Motor Feeder Short-Circuit and Ground-Fault Protection <\/td>\n<\/tr>\n
405<\/td>\n430.61 General.
430.62 Rating or Setting \u2014 Motor Load. 430.62(A) Specific Load.
430.62(B) Other Installations.
430.63 Rating or Setting \u2014 Motor Load and Other Load(s).
Part VI. Motor Control Circuits 430.71 General.
430.72 Overcurrent Protection. 430.72(A) General.
430.72(B) Conductor Protection.
430.72(B)(1) Separate Overcurrent Protection.
430.72(B)(2) Branch-Circuit Overcurrent Protective Device. <\/td>\n<\/tr>\n
406<\/td>\n430.72(C) Control Circuit Transformer.
430.72(C)(1) Compliance with Article 725.
430.72(C)(2) Compliance with Article 450.
430.72(C)(3) Less Than 50 Volt-Amperes.
430.72(C)(4) Primary Less Than 2 Amperes.
430.72(C)(5) Other Means.
430.73 Protection of Conductors from Physical Damage.
430.74 Electrical Arrangement of Control Circuits.
430.75 Disconnection. 430.75(A) General. <\/td>\n<\/tr>\n
407<\/td>\n430.75(B) Control Transformer in Controller Enclosure.
Part VII. Motor Controllers 430.81 General.
430.81(A) Stationary Motor of
Horsepower or Less.
430.81(B) Portable Motor of
Horsepower or Less.
430.82 Controller Design. 430.82(A) Starting and Stopping.
430.82(B) Autotransformer.
430.82(C) Rheostats.
430.83 Ratings.
430.83(A) General. 430.83(A)(1) Horsepower Ratings.
430.83(A)(2) Circuit Breaker.
430.83(A)(3) Molded Case Switch.
430.83(B) Small Motors.
430.83(C) Stationary Motors of 2 Horsepower or Less.
430.83(D) Torque Motors.
430.83(E) Voltage Rating. <\/td>\n<\/tr>\n
408<\/td>\n430.84 Need Not Open All Conductors.
430.85 In Grounded Conductors.
430.87 Number of Motors Served by Each Controller.
430.88 Adjustable-Speed Motors.
430.89 Speed Limitation.
430.90 Combination Fuseholder and Switch as Controller.
Part VIII. Motor Control Centers 430.92 General.
430.94 Overcurrent Protection.
430.95 Service Equipment.
430.96 Grounding.
430.97 Busbars and Conductors. 430.97(A) Support and Arrangement. <\/td>\n<\/tr>\n
409<\/td>\n430.97(B) Phase Arrangement.
430.97(C) Minimum Wire-Bending Space.
430.97(D) Spacings.
430.97(E) Barriers.
430.98 Marking. 430.98(A) Motor Control Centers.
430.98(B) Motor Control Units.
430.99 Available Fault Current.
Part IX. Disconnecting Means 430.101 General.
430.102 Location. 430.102(A) Controller.
430.102(B) Motor.
430.102(B)(1) Separate Motor Disconnect. <\/td>\n<\/tr>\n
410<\/td>\n430.102(B)(2) Controller Disconnect.
430.103 Operation.
430.104 To Be Indicating.
430.105 Grounded Conductors.
430.107 Readily Accessible.
430.108 Every Disconnecting Means.
430.109 Type.
430.109(A) General. 430.109(A)(1) Motor Circuit Switch.
430.109(A)(2) Molded Case Circuit Breaker.
430.109(A)(3) Molded Case Switch.
430.109(A)(4) Instantaneous Trip Circuit Breaker.
430.109(A)(5) Self-Protected Combination Controller.
430.109(A)(6) Manual Motor Controller.
430.109(A)(7) System Isolation Equipment.
430.109(B) Stationary Motors of
Horsepower or Less.
430.109(C) Stationary Motors of 2 Horsepower or Less. <\/td>\n<\/tr>\n
411<\/td>\n430.109(D) Autotransformer-Type Controlled Motors.
430.109(E) Isolating Switches.
430.109(F) Cord-and-Plug-Connected Motors.
430.109(G) Torque Motors.
430.110 Ampere Rating and Interrupting Capacity. 430.110(A) General.
430.110(B) For Torque Motors.
430.110(C) For Combination Loads.
430.110(C)(1) Horsepower Rating.
430.110(C)(2) Ampere Rating.
430.110(C)(3) Small Motors.
430.111 Switch or Circuit Breaker as Both Controller and Disconnecting Means.
430.111(A) General.
430.111(B) Type. <\/td>\n<\/tr>\n
412<\/td>\n430.111(B)(1) Air-Break Switch.
430.111(B)(2) Inverse Time Circuit Breaker.
430.111(B)(3) Oil Switch.
430.112 Motors Served by Single Disconnecting Means.
430.113 Energy from More Than One Source.
Part X. Adjustable-Speed Drive Systems 430.120 General.
430.122 Conductors \u2014 Minimum Size and Ampacity. 430.122(A) Branch\/Feeder Circuit Conductors.
430.122(B) Output Conductors.
430.122(C) Bypass Device.
430.122(D) Several Motors or a Motor and Other Loads.
430.124 Overload Protection. <\/td>\n<\/tr>\n
413<\/td>\n430.124(A) Included in Power Conversion Equipment.
430.124(B) Bypass Circuits.
430.124(C) Multiple Motor Applications.
430.126 Motor Overtemperature Protection. 430.126(A) General.
430.126(B) Multiple Motor Applications.
430.126(C) Automatic Restarting and Orderly Shutdown.
430.128 Disconnecting Means.
430.130 Branch-Circuit Short-Circuit and Ground-Fault Protection for Single Motor Circuits Containing Power Conversion Equipment
430.130(B) Bypass Circuit\/Device.
430.131 Several Motors or Loads on One Branch Circuit Including Power Conversion Equipment.
Part XI. Over 1000 Volts, Nominal 430.221 General. <\/td>\n<\/tr>\n
414<\/td>\n430.222 Marking on Controllers.
430.223 Raceway Connection to Motors.
430.224 Size of Conductors.
430.225 Motor-Circuit Overcurrent Protection. 430.225(A) General.
430.225(B) Overload Protection. 430.225(B)(1) Type of Overload Device.
430.225(B)(2) Wound-Rotor Alternating-Current Motors.
430.225(B)(3) Operation.
430.225(B)(4) Automatic Reset.
430.225(C) Fault-Current Protection. 430.225(C)(1) Type of Protection.
430.225(C)(2) Reclosing.
430.225(C)(3) Combination Protection.
430.226 Rating of Motor Control Apparatus.
430.227 Disconnecting Means.
Part XII. Protection of Live Parts \u2014 All Voltages 430.231 General.
430.232 Where Required. <\/td>\n<\/tr>\n
415<\/td>\n430.233 Guards for Attendants.
Part XIII. Grounding \u2014 All Voltages 430.241 General.
430.242 Stationary Motors.
430.243 Portable Motors.
430.244 Controllers.
430.245 Method of Grounding.
430.245(A) Grounding Through Terminal Housings.
430.245(B) Separation of Junction Box from Motor.
430.245(C) Grounding of Controller-Mounted Devices.
Part XIV. Tables <\/td>\n<\/tr>\n
420<\/td>\nARTICLE 440 Air-Conditioning and Refrigerating Equipment Part I. General 440.1 Scope.
440.2 Definitions.
Branch-Circuit Selection Current.
Leakage-Current Detector-Interrupter (LCDI).
Rated-Load Current. <\/td>\n<\/tr>\n
421<\/td>\n440.3 Other Articles. 440.3(A) Article 430.
440.3(B) Articles 422, 424, or 430.
440.3(C) Article 422.
440.3(D) Other Applicable Articles.
440.4 Marking on Hermetic Refrigerant Motor-Compressors and Equipment. 440.4(A) Hermetic Refrigerant Motor-Compressor Nameplate.
440.4(B) Multimotor and Combination-Load Equipment.
440.4(C) Branch-Circuit Selection Current.
440.5 Marking on Controllers.
440.6 Ampacity and Rating.
440.6(A) Hermetic Refrigerant Motor-Compressor. <\/td>\n<\/tr>\n
422<\/td>\n440.6(B) Multimotor Equipment.
440.7 Highest Rated (Largest) Motor.
440.8 Single Machine.
440.9 Grounding and Bonding.
440.10 Short-Circuit Current Rating. 440.10(A) Installation.
440.10(B) Documentation.
Part II. Disconnecting Means 440.11 General.
440.12 Rating and Interrupting Capacity. 440.12(A) Hermetic Refrigerant Motor-Compressor.
440.12(A)(1) Ampere Rating.
440.12(A)(2) Equivalent Horsepower.
440.12(B) Combination Loads.
440.12(B)(1) Horsepower Rating. <\/td>\n<\/tr>\n
423<\/td>\n440.12(B)(2) Full-Load Current Equivalent.
440.12(C) Small Motor-Compressors.
440.12(D) Disconnecting Means.
440.12(E) Disconnecting Means Rated in Excess of 100 Horsepower.
440.13 Cord-Connected Equipment.
440.14 Location.
Part III. Branch-Circuit Short-Circuit and Ground-Fault Protection 440.21 General.
440.22 Application and Selection. 440.22(A) Rating or Setting for Individual Motor-Compressor.
440.22(B) Rating or Setting for Equipment.
440.22(B)(1) Motor-Compressor Largest Load.
440.22(B)(2) Motor-Compressor Not Largest Load. <\/td>\n<\/tr>\n
424<\/td>\n440.22(C) Protective Device Rating Not to Exceed the Manufacturer\u2019s Values.
Part IV. Branch-Circuit Conductors 440.31 General.
440.32 Single Motor-Compressor.
440.33 Motor-Compressor(s) With or Without Additional Motor Loads.
440.34 Combination Load.
440.35 Multimotor and Combination-Load Equipment.
Part V. Controllers for Motor-Compressors 440.41 Rating. 440.41(A) Motor-Compressor Controller.
440.41(B) Controller Serving More Than One Load.
Part VI. Motor-Compressor and Branch-Circuit Overload Protection 440.51 General. <\/td>\n<\/tr>\n
425<\/td>\n440.52 Application and Selection. 440.52(A) Protection of Motor-Compressor.
440.52(B) Protection of Motor-Compressor Control Apparatus and Branch-Circuit Conductors.
440.53 Overload Relays.
440.54 Motor-Compressors and Equipment on 15or 20-Ampere Branch Circuits \u2014 Not Cordand Attachment-Plug-Connected.
440.54(A) Overload Protection.
440.54(B) Time Delay.
440.55 Cordand Attachment-Plug-Connected Motor-Compressors and Equipment on 15or 20-Ampere Branch Circuits.
440.55(A) Overload Protection.
440.55(B) Attachment Plug and Receptacle or Cord Connector Rating.
440.55(C) Time Delay.
Part VII. Provisions for Room Air Conditioners 440.60 General. <\/td>\n<\/tr>\n
426<\/td>\n440.61 Grounding.
440.62 Branch-Circuit Requirements. 440.62(A) Room Air Conditioner as a Single Motor Unit.
440.62(B) Where No Other Loads Are Supplied.
440.62(C) Where Lighting Units or Other Appliances Are Also Supplied.
440.63 Disconnecting Means.
440.64 Supply Cords.
440.65 Protection Devices.
ARTICLE 445 Generators 445.1 Scope.
445.6 Listing.
445.10 Location.
445.11 Marking. <\/td>\n<\/tr>\n
427<\/td>\n445.12 Overcurrent Protection. 445.12(A) Constant-Voltage Generators.
445.12(B) Two-Wire Generators.
445.12(C) 65 Volts or Less.
445.12(D) Balancer Sets.
445.12(E) Three-Wire, Direct-Current Generators.
445.13 Ampacity of Conductors. 445.13(A) General.
445.13(B) Overcurrent Protection Provided.
445.14 Protection of Live Parts.
445.15 Guards for Attendants.
445.16 Bushings.
445.17 Generator Terminal Housings.
445.18 Disconnecting Means and Emergency Shutdown. 445.18(A) Disconnecting Means.
445.18(B) Emergency Shutdown of Prime Mover. <\/td>\n<\/tr>\n
428<\/td>\n445.18(C) Remote Emergency Shutdown.
445.18(D) Emergency Shutdown in Oneand Two-Family Dwelling Units.
445.18(E) Generators Installed in Parallel.
445.20 Ground-Fault Circuit-Interrupter Protection for Receptacles on 15-kW or Smaller Portable Generators.
445.20(A) Unbonded (Floating Neutral) Generators.
445.20(B) Bonded Neutral Generators.
ARTICLE 450 Transformers and Transformer Vaults (Including Secondary Ties) Part I. General Provisions 450.1 Scope.
450.2 Definition.
Transformer.
450.3 Overcurrent Protection.
450.3(A) Transformers Over 1000 Volts, Nominal. <\/td>\n<\/tr>\n
429<\/td>\n450.3(B) Transformers 1000 Volts, Nominal, or Less. <\/td>\n<\/tr>\n
430<\/td>\n450.3(C) Voltage (Potential) Transformers.
450.4 Autotransformers 1000 Volts, Nominal, or Less. 450.4(A) Overcurrent Protection.
Figure 450.4(A) Autotransformer.
450.4(B) Transformer Field-Connected as an Autotransformer.
450.5 Grounding Autotransformers.
450.5(A) Three-Phase, 4-Wire System.
450.5(A)(1) Connections.
450.5(A)(2) Overcurrent Protection.
450.5(A)(3) Transformer Fault Sensing. <\/td>\n<\/tr>\n
431<\/td>\n450.5(A)(4) Rating.
450.5(B) Ground Reference for Fault Protection Devices.
450.5(B)(1) Rating.
450.5(B)(2) Overcurrent Protection.
450.5(C) Ground Reference for Damping Transitory Overvoltages.
450.6 Secondary Ties.
450.6(A) Tie Circuits.
450.6(A)(1) Loads at Transformer Supply Points Only.
450.6(A)(2) Loads Connected Between Transformer Supply Points.
450.6(A)(3) Tie Circuit Protection.
450.6(A)(4) Interconnection of Phase Conductors Between Transformer Supply Points.
450.6(A)(5) Tie Circuit Control.
450.6(B) Overcurrent Protection for Secondary Connections. <\/td>\n<\/tr>\n
432<\/td>\n450.6(C) Grounding.
450.7 Parallel Operation.
450.8 Guarding.
450.8(A) Mechanical Protection.
450.8(B) Case or Enclosure.
450.8(C) Exposed Energized Parts.
450.8(D) Voltage Warning.
450.9 Ventilation.
450.10 Grounding. 450.10(A) Dry-Type Transformer Enclosures.
450.10(B) Other Metal Parts.
450.11 Marking. 450.11(A) General.
450.11(B) Source Marking.
450.12 Terminal Wiring Space. <\/td>\n<\/tr>\n
433<\/td>\n450.13 Accessibility.
450.13(A) Open Installations.
450.13(B) Hollow Space Installations.
450.14 Disconnecting Means.
Part II. Specific Provisions Applicable to Different Types of Transformers 450.21 Dry-Type Transformers Installed Indoors. 450.2
kVA.
450.21(B) Over 1121\/
kVA.
450.21(C) Over 35,000 Volts.
450.22 Dry-Type Transformers Installed Outdoors.
450.23 Less-Flammable Liquid-Insulated Transformers.
450.23(A) Indoor Installations.
450.23(B) Outdoor Installations.
450.24 Nonflammable Fluid-Insulated Transformers. <\/td>\n<\/tr>\n
434<\/td>\n450.25 Askarel-Insulated Transformers Installed Indoors.
450.26 Oil-Insulated Transformers Installed Indoors.
450.27 Oil-Insulated Transformers Installed Outdoors.
450.28 Modification of Transformers.
Part III. Transformer Vaults 450.41 Location.
450.42 Walls, Roofs, and Floors. <\/td>\n<\/tr>\n
435<\/td>\n450.43 Doorways.
450.43(A) Type of Door.
450.43(B) Sills.
450.43(C) Locks.
450.45 Ventilation Openings.
450.45(A) Location.
450.45(B) Arrangement.
450.45(C) Size.
450.45(D) Covering.
450.45(E) Dampers.
450.45(F) Ducts.
450.46 Drainage.
450.47 Water Pipes and Accessories.
450.48 Storage in Vaults.
ARTICLE 455 Phase Converters Part I. General 455.1 Scope.
455.2 Definitions. Manufactured Phase. <\/td>\n<\/tr>\n
436<\/td>\nPhase Converter.
Rotary-Phase Converter.
Static-Phase Converter.
455.3 Other Articles.
455.4 Marking.
455.5 Equipment Grounding Connection.
455.6 Conductors. 455.6(A) Ampacity.
455.6(A)(1) Variable Loads.
455.6(A)(2) Fixed Loads.
455.6(B) Manufactured Phase Marking.
455.7 Overcurrent Protection.
455.7(A) Variable Loads.
455.7(B) Fixed Loads.
455.8 Disconnecting Means. <\/td>\n<\/tr>\n
437<\/td>\n455.8(A) Location.
455.8(B) Type.
455.8(C) Rating.
455.8(C)(1) Current Rated Disconnect.
455.8(C)(2) Horsepower Rated Disconnect.
455.8(D) Voltage Ratios.
455.9 Connection of Single-Phase Loads.
455.10 Terminal Housings.
Part II. Specific Provisions Applicable to Different Types of Phase Converters 455.20 Disconnecting Means.
455.21 Start-Up.
455.22 Power Interruption.
455.23 Capacitors.
ARTICLE 460 Capacitors 460.1 Scope.
460.2 Definitions.
Safe Zone.
460.3 Enclosing and Guarding. <\/td>\n<\/tr>\n
438<\/td>\n460.3(A) Containing More Than 11 L (3 gal) of Flammable Liquid.
460.3(B) Accidental Contact.
Part I. 1000 Volts, Nominal, and Under 460.6 Discharge of Stored Energy.
460.6(A) Time of Discharge.
460.6(B) Means of Discharge.
460.8 Conductors. 460.8(A) Ampacity.
460.8(B) Overcurrent Protection.
460.8(C) Disconnecting Means.
460.9 Rating or Setting of Motor Overload Device.
460.10 Grounding.
460.12 Marking.
Part II. Over 1000 Volts, Nominal 460.24 Switching. 460.24(A) Load Current.
460.24(B) Isolation. 460.24(B)(1) General. <\/td>\n<\/tr>\n
439<\/td>\n460.24(B)(2) Isolating or Disconnecting Switches with No Interrupting Rating.
460.24(C) Additional Requirements for Series Capacitors.
460.25 Overcurrent Protection. 460.25(A) Provided to Detect and Interrupt Fault Current.
460.25(B) Single Pole or Multipole Devices.
460.25(C) Protected Individually or in Groups.
460.25(D) Protective Devices Rated or Adjusted.
460.26 Identification.
460.27 Grounding.
460.28 Means for Discharge. 460.28(A) Means to Reduce the Residual Voltage.
460.28(B) Connection to Terminals.
ARTICLE 470 Resistors and Reactors Part I. 1000 Volts, Nominal, and Under 470.1 Scope.
470.2 Location.
470.3 Space Separation.
470.4 Conductor Insulation. <\/td>\n<\/tr>\n
440<\/td>\nPart II. Over 1000 Volts, Nominal 470.18 General. 470.18(A) Protected Against Physical Damage.
470.18(B) Isolated by Enclosure or Elevation.
470.18(C) Combustible Materials.
470.18(D) Clearances.
470.18(E) Temperature Rise from Induced Circulating Currents.
470.19 Grounding.
470.20 Oil-Filled Reactors.
ARTICLE 480 Storage Batteries 480.1 Scope.
480.2 Definitions.
Cell.
Container.
Electrolyte.
Intercell Connector. <\/td>\n<\/tr>\n
441<\/td>\nIntertier Connector.
Nominal Voltage (Battery or Cell).
Sealed Cell or Battery.
Storage Battery (Battery).
Terminal.
480.3 Equipment.
480.4 Battery and Cell Terminations. 480.4(A) Corrosion Prevention.
480.4(B) Intercell and Intertier Conductors and Connections.
480.4(C) Battery Terminals.
480.4(D) Accessibility.
480.5 Wiring and Equipment Supplied from Batteries.
480.6 Overcurrent Protection for Prime Movers.
480.7 DC Disconnect Methods. 480.7(A) Disconnecting Means.
480.7(B) Emergency Disconnect.
480.7(C) Disconnection of Series Battery Circuits.
480.7(D) Remote Actuation. <\/td>\n<\/tr>\n
442<\/td>\n480.7(E) Busway.
480.7(F) Notification.
480.7(G) Identification of Power Sources.
480.7(G)(1) Facilities with Utility Services and Battery Systems.
480.7(G)(2) Facilities with Stand-Alone Systems.
480.8 Insulation of Batteries.
480.9 Battery Support Systems.
480.10 Battery Locations.
480.10(A) Ventilation.
480.10(B) Live Parts.
480.10(C) Spaces About Battery Systems.
480.10(D) Top Terminal Batteries.
480.10(E) Egress. <\/td>\n<\/tr>\n
443<\/td>\n480.10(F) Piping in Battery Rooms.
480.10(G) Illumination.
480.11 Vents. 480.11(A) Vented Cells.
480.11(B) Sealed Cells.
480.12 Battery Interconnections.
480.13 Ground-Fault Detection.
ARTICLE 490 Equipment Over 1000 Volts, Nominal Part I. General 490.1 Scope.
490.2 Definition.
High Voltage.
490.3 Other Articles. 490.3(A) Oil-Filled Equipment.
490.3(B) Enclosures in Damp or Wet Locations.
Part II. Equipment \u2014 Specific Provisions 490.21 Circuit-Interrupting Devices. 490.21(A) Circuit Breakers. 490.21(A)(1) Location. <\/td>\n<\/tr>\n
444<\/td>\n490.21(A)(2) Operating Characteristics.
490.21(A)(3) Nameplate.
490.21(A)(4) Rating.
490.21(A)(5) Retrofit Trip Units.
490.21(B) Power Fuses and Fuseholders. 490.21(B)(1) Use.
490.21(B)(2) Interrupting Rating.
490.21(B)(3) Voltage Rating.
490.21(B)(4) Identification of Fuse Mountings and Fuse Units.
490.21(B)(5) Fuses.
490.21(B)(6) Fuseholders.
490.21(B)(7) High-Voltage Fuses.
490.21(C) Distribution Cutouts and Fuse Links \u2014 Expulsion Type. 490.21(C)(1) Installation.
490.21(C)(2) Operation. <\/td>\n<\/tr>\n
445<\/td>\n490.21(C)(3) Interrupting Rating.
490.21(C)(4) Voltage Rating.
490.21(C)(5) Identification.
490.21(C)(6) Fuse Links.
490.21(C)(7) Structure Mounted Outdoors.
490.21(D) Oil-Filled Cutouts. 490.21(D)(1) Continuous Current Rating.
490.21(D)(2) Interrupting Rating.
490.21(D)(3) Voltage Rating.
490.21(D)(4) Fault Closing Rating.
490.21(D)(5) Identification.
490.21(D)(6) Fuse Links.
490.21(D)(7) Location.
490.21(D)(8) Enclosure.
490.21(E) Load Interrupters.
490.21(E)(1) Continuous Current Rating.
490.21(E)(2) Voltage Rating.
490.21(E)(3) Identification.
490.21(E)(4) Switching of Conductors.
490.21(E)(5) Stored Energy for Opening. <\/td>\n<\/tr>\n
446<\/td>\n490.21(E)(6) Supply Terminals.
490.22 Isolating Means.
490.23 Voltage Regulators.
490.24 Minimum Space Separation. <\/td>\n<\/tr>\n
447<\/td>\n490.25 Backfeed.
490.25(A) Sign.
490.25(B) Diagram.
Part III. Equipment \u2014 Switchgear and Industrial Control Assemblies 490.30 General.
490.31 Arrangement of Devices in Assemblies.
490.32 Guarding of High-Voltage Energized Parts Within a Compartment.
490.33 Guarding of Energized Parts Operating at 1000 Volts, Nominal, or Less Within Compartments.
490.34 Clearance for Cable Conductors Entering Enclosure.
490.35 Accessibility of Energized Parts. 490.35(A) High-Voltage Equipment.
490.35(B) Control Equipment.
490.35(C) High-Voltage Instruments or Control Transformers and Space Heaters.
490.36 Grounding.
490.37 Grounding of Devices.
490.38 Door Stops and Cover Plates.
490.39 Gas Discharge from Interrupting Devices.
490.40 Visual Inspection Windows.
490.41 Location of Industrial Control Equipment. <\/td>\n<\/tr>\n
448<\/td>\n490.41(A) Control and Instrument Transfer Switch Handles or Push Buttons.
490.41(B) Infrequently Operated Devices.
490.42 Interlocks \u2014 Interrupter Switches.
490.43 Stored Energy for Opening.
490.44 Fused Interrupter Switches. 490.44(A) Supply Terminals.
490.44(B) Backfeed.
490.44(C) Switching Mechanism.
490.45 Circuit Breakers \u2014 Interlocks. 490.45(A) Circuit Breakers.
490.45(B) Mechanical Interlocks.
490.46 Circuit Breaker Locking.
490.47 Switchgear Used as Service Equipment.
490.48 Substation Design, Documentation, and Required Diagram. 490.48(A) Design and Documentation.
490.48(B) Diagram. <\/td>\n<\/tr>\n
449<\/td>\n490.49 Reconditioned Switchgear.
Part IV. Mobile and Portable Equipment 490.51 General. 490.51(A) Covered.
490.51(B) Other Requirements.
490.51(C) Protection.
490.51(D) Disconnecting Means.
490.52 Overcurrent Protection.
490.53 Enclosures.
490.54 Collector Rings.
490.55 Power Cable Connections to Mobile Machines.
490.56 High-Voltage Portable Cable for Main Power Supply.
Part V. Electrode-Type Boilers 490.70 General.
490.71 Electrical Supply System.
490.72 Branch-Circuit Requirements. 490.72(A) Rating.
490.72(B) Common-Trip Fault-Interrupting Device.
490.72(C) Phase-Fault Protection. <\/td>\n<\/tr>\n
450<\/td>\n490.72(D) Ground Current Detection.
490.72(E) Grounded Neutral Conductor.
490.73 Pressure and Temperature Limit Control.
490.74 Bonding.
Chapter 5 Special Occupancies
ARTICLE 500 Hazardous (Classified) Locations, Classes I, II, and III, Divisions 1 and 2 500.1 Scope \u2014 Articles 500 Through 504.
500.3 Other Articles.
500.4 Documentation. <\/td>\n<\/tr>\n
451<\/td>\n500.5 Classifications of Locations. 500.5(A) General.
500.5(B) Class I Locations.
500.5(B)(1) Class I, Division 1.
500.5(B)(2) Class I, Division 2. <\/td>\n<\/tr>\n
452<\/td>\n500.5(C) Class II Locations.
500.5(C)(1) Class II, Division 1.
500.5(C)(2) Class II, Division 2.
500.5(D) Class III Locations.
500.5(D)(1) Class III, Division 1.
500.5(D)(2) Class III, Division 2.
500.6 Material Groups.
500.6(A) Class I Group Classifications. <\/td>\n<\/tr>\n
453<\/td>\n500.6(A)(1) Group A.
500.6(A)(2) Group B.
500.6(A)(3) Group C.
500.6(A)(4) Group D.
500.6(B) Class II Group Classifications.
500.6(B)(1) Group E.
500.6(B)(2) Group F.
500.6(B)(3) Group G.
500.7 Protection Techniques.
500.7(A) Explosionproof Equipment.
500.7(B) Dust Ignitionproof.
500.7(C) Dusttight.
500.7(D) Purged and Pressurized. <\/td>\n<\/tr>\n
454<\/td>\n500.7(E) Intrinsic Safety.
500.7(F) Nonincendive Circuit.
500.7(G) Nonincendive Equipment.
500.7(H) Nonincendive Component.
500.7(I) Oil Immersion.
500.7(J) Hermetically Sealed.
500.7(K) Combustible Gas Detection System.
500.7(K)(1) General.
500.7(K)(2) Inadequate Ventilation.
500.7(K)(3) Interior of a Building or Enclosed Space.
500.7(K)(4) Interior of a Control Panel.
500.7(L) Inherently Safe Optical Radiation \u201cop is.\u201d <\/td>\n<\/tr>\n
455<\/td>\n500.7(M) Protected Optical Radiation \u201cop pr.\u201d
500.7(N) Optical System With Interlock \u201cop sh.\u201d
500.7(O) Protection by Skin Effect Trace Heating \u201cIEEE 844.1\u201d.
500.7(P) Other Protection Techniques.
500.8 Equipment.
500.8(A) Suitability.
500.8(B) Approval for Class and Properties. 500.8(B)(1)
500.8(B)(2)
500.8(B)(3)
500.8(B)(4)
500.8(B)(5) <\/td>\n<\/tr>\n
456<\/td>\n500.8(B)(6)
500.8(C) Marking.
500.8(C)(1) Class.
500.8(C)(2) Division.
500.8(C)(3) Material Classification Group.
500.8(C)(4) Equipment Temperature.
500.8(C)(5) Ambient Temperature Range. <\/td>\n<\/tr>\n
457<\/td>\n500.8(C)(6) Special Allowances.
500.8(D) Temperature. 500.8(D)(1) Class I Temperature.
500.8(D)(2) Class II Temperature.
500.8(E) Threading.
500.8(E)(1) Equipment Provided with Threaded Entries for NPT-Threaded Conduit or Fittings.
500.8(E)(2) Equipment Provided with Threaded Entries for Metric-Threaded Fittings.
500.8(E)(3) Unused Openings.
500.8(F) Optical Fiber Cables.
500.8(G) Equipment Involving Optical Radiation. <\/td>\n<\/tr>\n
458<\/td>\n500.9 Specific Occupancies.
ARTICLE 501 Class I Locations Part I. General 501.1 Scope.
501.5 Zone Equipment.
Part II. Wiring 501.10 Wiring Methods.
501.10(A) Class I, Division 1. 501.10(A)(1) General.
501.10(A)(2) Flexible Connections.
501.10(A)(3) Boxes and Fittings. <\/td>\n<\/tr>\n
459<\/td>\n501.10(B) Class I, Division 2. 501.10(B)(1) General.
501.10(B)(2) Flexible Connections.
501.10(B)(3) Nonincendive Field Wiring.
501.10(B)(4) Boxes and Fittings.
501.15 Sealing and Drainage. <\/td>\n<\/tr>\n
460<\/td>\n501.15(A) Conduit Seals, Class I, Division 1.
501.15(A)(1) Entering Enclosures.
501.15(A)(2) Pressurized Enclosures.
501.15(A)(3) Two or More Explosionproof Enclosures.
501.15(A)(4) Class I, Division 1 Boundary.
501.15(B) Conduit Seals, Class I, Division 2.
501.15(B)(1) Entering Enclosures.
501.15(B)(2) Class I, Division 2 Boundary. <\/td>\n<\/tr>\n
461<\/td>\n501.15(C) Class I, Divisions 1 and 2.
501.15(C)(1) Fittings.
501.15(C)(2) Compound.
501.15(C)(3) Thickness of Compounds.
501.15(C)(4) Splices and Taps.
501.15(C)(5) Assemblies.
501.15(C)(6) Conductor or Optical Fiber Fill.
501.15(D) Cable Seals, Class I, Division 1.
501.15(D)(1) At Terminations.
501.15(D)(2) Cables Capable of Transmitting Gases or Vapors.
501.15(D)(3) Cables Incapable of Transmitting Gases or Vapors.
501.15(E) Cable Seals, Class I, Division 2. <\/td>\n<\/tr>\n
462<\/td>\n501.15(E)(1) Terminations.
501.15(E)(2) Cables That Do Not Transmit Gases or Vapors.
501.15(E)(3) Cables Capable of Transmitting Gases or Vapors.
501.15(E)(4) Cables Without Gas\/Vaportight Sheath.
501.15(F) Drainage. 501.15(F)(1) Control Equipment.
501.15(F)(2) Motors and Generators.
501.17 Process Sealing.
501.20 Conductor Insulation, Class I, Divisions 1 and 2.
501.25 Uninsulated Exposed Parts, Class I, Divisions 1 and 2.
501.30 Grounding and Bonding, Class I, Divisions 1 and 2.
501.30(A) Bonding. <\/td>\n<\/tr>\n
463<\/td>\n501.30(B) Types of Equipment Grounding Conductors.
501.35 Surge Protection. 501.35(A) Class I, Division 1.
501.35(B) Class I, Division 2.
Part III. Equipment 501.100 Transformers and Capacitors. 501.100(A) Class I, Division 1.
501.100(A)(1) Containing Liquid That Will Burn.
501.100(A)(2) Not Containing Liquid That Will Burn.
501.100(B) Class I, Division 2.
501.105 Meters, Instruments, and Relays. 501.105(A) Class I, Division 1.
501.105(B) Class I, Division 2.
501.105(B)(1) General-Purpose Assemblies.
501.105(B)(2) Contacts.
501.105(B)(3) Resistors and Similar Equipment. <\/td>\n<\/tr>\n
464<\/td>\n501.105(B)(4) Without Make-or-Break Contacts.
501.105(B)(5) Fuses.
501.105(B)(6) Connections.
501.115 Switches, Circuit Breakers, Motor Controllers, and Fuses. 501.115(A) Class I, Division 1.
501.115(B) Class I, Division 2.
501.115(B)(1) Type Required.
501.115(B)(2) Isolating Switches.
501.115(B)(3) Fuses.
501.115(B)(4) Fuses Internal to Luminaires.
501.120 Control Transformers and Resistors.
501.120(A) Class I, Division 1.
501.120(B) Class I, Division 2.
501.120(B)(1) Switching Mechanisms.
501.120(B)(2) Coils and Windings. <\/td>\n<\/tr>\n
465<\/td>\n501.120(B)(3) Resistors.
501.125 Motors and Generators. 501.125(A) Class I, Division 1.
501.125(B) Class I, Division 2.
501.130 Luminaires.
501.130(A) Class I, Division 1.
501.130(A)(1) Luminaires.
501.130(A)(2) Physical Damage.
501.130(A)(3) Pendant Luminaires.
501.130(A)(4) Supports. <\/td>\n<\/tr>\n
466<\/td>\n501.130(B) Class I, Division 2.
501.130(B)(1) Luminaires.
501.130(B)(2) Physical Damage.
501.130(B)(3) Pendant Luminaires.
501.130(B)(4) Portable Lighting Equipment.
501.130(B)(5) Switches.
501.130(B)(6) Starting Equipment.
501.135 Utilization Equipment. 501.135(A) Class I, Division 1.
501.135(B) Class I, Division 2.
501.135(B)(1) Heaters.
501.135(B)(2) Motors.
501.135(B)(3) Switches, Circuit Breakers, and Fuses.
501.140 Flexible Cords, Class I, Divisions 1 and 2. 501.140(A) Permitted Uses. <\/td>\n<\/tr>\n
467<\/td>\n501.140(B) Installation.
501.145 Receptacles and Attachment Plugs, Class I, Divisions 1 and 2. 501.145(A) Receptacles.
501.145(B) Attachment Plugs.
501.150 Signaling, Alarm, Remote-Control, and Communications Systems. 501.150(A) Class I, Division 1.
501.150(B) Class I, Division 2.
501.150(B)(1) Contacts.
501.150(B)(2) Resistors and Similar Equipment.
501.150(B)(3) Protectors.
501.150(B)(4) Wiring and Sealing.
ARTICLE 502 Class II Locations Part I. General 502.1 Scope.
502.5 Explosionproof Equipment.
502.6 Zone Equipment. <\/td>\n<\/tr>\n
468<\/td>\nPart II. Wiring 502.10 Wiring Methods.
502.10(A) Class II, Division 1. 502.10(A)(1) General.
502.10(A)(2) Flexible Connections.
502.10(A)(3) Boxes and Fittings.
502.10(B) Class II, Division 2. 502.10(B)(1) General. <\/td>\n<\/tr>\n
469<\/td>\n502.10(B)(2) Flexible Connections.
502.10(B)(3) Nonincendive Field Wiring.
502.10(B)(4) Boxes and Fittings.
502.15 Sealing, Class II, Divisions 1 and 2.
502.25 Uninsulated Exposed Parts, Class II, Divisions 1 and 2.
502.30 Grounding and Bonding, Class II, Divisions 1 and 2.
502.30(A) Bonding.
502.30(B) Types of Equipment Grounding Conductors. <\/td>\n<\/tr>\n
470<\/td>\n502.35 Surge Protection \u2014 Class II, Divisions 1 and 2.
Part III. Equipment 502.100 Transformers and Capacitors. 502.100(A) Class II, Division 1.
502.100(A)(1) Containing Liquid That Will Burn.
502.100(A)(2) Not Containing Liquid That Will Burn.
502.100(A)(3) Group E.
502.100(B) Class II, Division 2.
502.100(B)(1) Containing Liquid That Will Burn.
502.100(B)(2) Containing Askarel.
502.100(B)(3) Dry-Type Transformers.
502.115 Switches, Circuit Breakers, Motor Controllers, and Fuses. 502.115(A) Class II, Division 1.
502.115(B) Class II, Division 2.
502.120 Control Transformers and Resistors. 502.120(A) Class II, Division 1.
502.120(B) Class II, Division 2.
502.120(B)(1) Switching Mechanisms.
502.120(B)(2) Coils and Windings.
502.120(B)(3) Resistors. <\/td>\n<\/tr>\n
471<\/td>\n502.125 Motors and Generators. 502.125(A) Class II, Division 1.
502.125(B) Class II, Division 2.
502.128 Ventilating Piping.
502.128(A) Class II, Division 1.
502.128(B) Class II, Division 2.
502.130 Luminaires. 502.130(A) Class II, Division 1.
502.130(A)(1) Marking.
502.130(A)(2) Physical Damage.
502.130(A)(3) Pendant Luminaires.
502.130(A)(4) Supports.
502.130(B) Class II, Division 2.
502.130(B)(1) Portable Lighting Equipment. <\/td>\n<\/tr>\n
472<\/td>\n502.130(B)(2) Fixed Lighting.
502.130(B)(3) Physical Damage.
502.130(B)(4) Pendant Luminaires.
502.130(B)(5) Electric-Discharge Lamps.
502.135 Utilization Equipment. 502.135(A) Class II, Division 1.
502.135(B) Class II, Division 2.
502.135(B)(1) Heaters.
502.135(B)(2) Motors.
502.135(B)(3) Switches, Circuit Breakers, and Fuses.
502.135(B)(4) Transformers, Solenoids, Impedance Coils, and Resistors.
502.140 Flexible Cords \u2014 Class II, Divisions 1 and 2. 502.140(A) Permitted Uses.
502.140(B) Installation.
502.145 Receptacles and Attachment Plugs. <\/td>\n<\/tr>\n
473<\/td>\n502.145(A) Class II, Division 1. 502.145(A)(1) Receptacles.
502.145(A)(2) Attachment Plugs.
502.145(B) Class II, Division 2. 502.145(B)(1) Receptacles.
502.145(B)(2) Attachment Plugs.
502.150 Signaling, Alarm, Remote-Control, and Communications Systems; and Meters, Instruments, and Relays.
502.150(A) Class II, Division 1.
502.150(A)(1) Contacts.
502.150(A)(2) Resistors and Similar Equipment.
502.150(A)(3) Rotating Machinery.
502.150(B) Class II, Division 2.
502.150(B)(1) Contacts.
502.150(B)(2) Transformers and Similar Equipment.
502.150(B)(3) Resistors and Similar Equipment.
502.150(B)(4) Rotating Machinery.
502.150(B)(5) Connections.
ARTICLE 503 Class III Locations <\/td>\n<\/tr>\n
474<\/td>\nPart I. General 503.1 Scope.
503.5 General.
503.6 Zone Equipment.
Part II. Wiring 503.10 Wiring Methods.
503.10(A) Class III, Division 1. 503.10(A)(1) General.
503.10(A)(2) Boxes and Fittings.
503.10(A)(3) Flexible Connections.
503.10(A)(4) Nonincendive Field Wiring.
503.10(B) Class III, Division 2. <\/td>\n<\/tr>\n
475<\/td>\n503.25 Uninsulated Exposed Parts, Class III, Divisions 1 and 2.
503.30 Grounding and Bonding \u2014 Class III, Divisions 1 and 2.
503.30(A) Bonding.
503.30(B) Types of Equipment Bonding Conductors.
Part III. Equipment 503.100 Transformers and Capacitors \u2014 Class III, Divisions 1 and 2.
503.115 Switches, Circuit Breakers, Motor Controllers, and Fuses \u2014 Class III, Divisions 1 and 2.
503.120 Control Transformers and Resistors \u2014 Class III, Divisions 1 and 2.
503.125 Motors and Generators \u2014 Class III, Divisions 1 and 2.
503.128 Ventilating Piping \u2014 Class III, Divisions 1 and 2.
503.130 Luminaires \u2014 Class III, Divisions 1 and 2. 503.130(A) Fixed Lighting.
503.130(B) Physical Damage.
503.130(C) Pendant Luminaires. <\/td>\n<\/tr>\n
476<\/td>\n503.130(D) Portable Lighting Equipment.
503.135 Utilization Equipment \u2014 Class III, Divisions 1 and 2. 503.135(A) Heaters.
503.135(B) Motors.
503.135(C) Switches, Circuit Breakers, Motor Controllers, and Fuses.
503.140 Flexible Cords \u2014 Class III, Divisions 1 and 2.
503.145 Receptacles and Attachment Plugs \u2014 Class III, Divisions 1 and 2.
503.150 Signaling, Alarm, Remote-Control, and Local Loudspeaker Intercommunications Systems \u2014 Class III, Divisions 1 and 2.
503.155 Electric Cranes, Hoists, and Similar Equipment \u2014 Class III, Divisions 1 and 2.
503.155(A) Power Supply.
503.155(B) Contact Conductors.
503.155(C) Current Collectors.
503.155(D) Control Equipment.
503.160 Storage Battery Charging Equipment \u2014 Class III, Divisions 1 and 2.
ARTICLE 504 Intrinsically Safe Systems 504.1 Scope.
504.3 Application of Other Articles. <\/td>\n<\/tr>\n
477<\/td>\n504.4 Equipment.
504.10 Equipment Installation. 504.10(A) Control Drawing.
504.10(B) Location.
504.10(C) Enclosures.
504.10(D) Simple Apparatus.
504.20 Wiring Methods.
504.30 Separation of Intrinsically Safe Conductors. 504.30(A) From Nonintrinsically Safe Circuit Conductors. <\/td>\n<\/tr>\n
478<\/td>\n504.30(A)(1) In Raceways, Cable Trays, and Cables.
504.30(A)(2) Within Enclosures.
504.30(A)(3) Other (Not in Raceway or Cable Tray Systems).
504.30(B) From Different Intrinsically Safe Circuit Conductors.
504.30(C) From Grounded Metal.
504.50 Grounding. 504.50(A) Intrinsically Safe Apparatus, Enclosures, and Raceways.
504.50(B) Associated Apparatus and Cable Shields.
504.50(C) Connection to Grounding Electrodes. <\/td>\n<\/tr>\n
479<\/td>\n504.60 Bonding. 504.60(A) Intrinsically Safe Apparatus.
504.60(B) Metal Raceways.
504.70 Sealing.
504.80 Identification.
504.80(A) Terminals.
504.80(B) Wiring.
504.80(C) Color Coding.
ARTICLE 505 Zone 0, 1, and 2 Locations 505.1 Scope.
505.3 Other Articles.
505.4 Documentation. <\/td>\n<\/tr>\n
480<\/td>\n505.5 Classifications of Locations. 505.5(A) General.
505.5(B) Zone 0, 1, and 2 Locations.
505.5(B)(1) Zone 0.
505.5(B)(2) Zone 1. <\/td>\n<\/tr>\n
481<\/td>\n505.5(B)(3) Zone 2.
505.6 Material Groups.
505.6(A) Group IIC.
505.6(B) Group IIB.
505.6(C) Group IIA.
505.7 Special Precaution. <\/td>\n<\/tr>\n
482<\/td>\n505.7(A) Implementation of Zone Classification System.
505.7(B) Dual Classification.
505.7(C) Reclassification Permitted.
505.7(D) Solid Obstacles.
505.7(E) Simultaneous Presence of Flammable Gases and Combustible Dusts or Fibers\/Flyings.
505.7(F) Available Fault Current for Type of Protection \u201ce\u201d.
505.8 Protection Techniques.
505.8(A) Flameproof Enclosure \u201cd\u201d.
505.8(B) Pressurized Enclosure \u201cp\u201d.
505.8(C) Intrinsic Safety \u201ci\u201d.
505.8(D) Type of Protection \u201cn\u201d.
505.8(E) Liquid Immersion \u201co\u201d.
505.8(F) Increased Safety \u201ce\u201d. <\/td>\n<\/tr>\n
483<\/td>\n505.8(G) Encapsulation \u201cm\u201d.
505.8(H) Powder Filling \u201cq\u201d.
505.8(I) Combustible Gas Detection System.
505.8(I)(1) General.
505.8(I)(2) Inadequate Ventilation.
505.8(I)(3) Interior of a Building or Enclosed Space.
505.8(I)(4) Interior of a Control Panel.
505.8(J) Protection by Electrical Resistance Trace Heating \u201c60079-30-1\u201d.
505.8(K) Inherently Safe Optical Radiation \u201cop is\u201d.
505.8(L) Protected Optical Radiation \u201cop pr\u201d.
505.8(M) Optical System With Interlock \u201cop sh\u201d.
505.8(N) Protection by Skin Effect Trace Heating \u201cIEEE 844.1\u201d.
505.9 Equipment. 505.9(A) Suitability. <\/td>\n<\/tr>\n
484<\/td>\n505.9(B) Listing.
505.9(C) Marking.
505.9(C)(1) Division Equipment.
505.9(C)(2) Zone Equipment. <\/td>\n<\/tr>\n
485<\/td>\nInformational Note Figure 505.9(C)(2), No. 1 Zone Equipment Marking. <\/td>\n<\/tr>\n
486<\/td>\n505.9(D) Class I Temperature.
505.9(D)(1) Temperature Classifications. <\/td>\n<\/tr>\n
487<\/td>\n505.9(E) Threading.
505.9(E)(1) Equipment Provided with Threaded Entries for NPT Threaded Conduit or Fittings.
505.9(E)(2) Equipment Provided with Threaded Entries for Metric Threaded Conduit or Fittings.
505.9(E)(3) Unused Openings.
505.9(F) Optical Fiber Cables.
505.9(G) Equipment Involving Optical Radiation.
505.15 Wiring Methods.
505.15(A) Zone 0.
505.15(B) Zone 1. 505.15(B)(1) General. <\/td>\n<\/tr>\n
488<\/td>\n505.15(B)(2) Flexible Connections.
505.15(C) Zone 2. 505.15(C)(1) General.
505.15(C)(2) Flexible Connections. <\/td>\n<\/tr>\n
489<\/td>\n505.16 Sealing and Drainage.
505.16(A) Zone 0.
505.16(A)(1) Conduit Seals.
505.16(A)(2) Cable Seals.
505.16(A)(3) Not Required to Be Explosionproof or Flameproof.
505.16(B) Zone 1.
505.16(B)(1) Type of Protection \u201cd\u201d, \u201cdb\u201d, \u201ce\u201d, or \u201ceb\u201d Enclosures.
505.16(B)(2) Explosionproof Equipment.
505.16(B)(3) Pressurized Enclosures. <\/td>\n<\/tr>\n
490<\/td>\n505.16(B)(4) Zone 1 Boundary.
505.16(B)(5) Cables Capable of Transmitting Gases or Vapors.
505.16(B)(6) Cables Incapable of Transmitting Gases or Vapors.
505.16(B)(7) Cables Entering Enclosures.
505.16(B)(8) Zone 1 Boundary.
505.16(C) Zone 2.
505.16(C)(1) Conduit Seals.
505.16(C)(2) Cable Seals. <\/td>\n<\/tr>\n
491<\/td>\n505.16(D) Zones 0, 1, and 2.
505.16(D)(1) Fittings.
505.16(D)(2) Compound.
505.16(D)(3) Thickness of Compounds.
505.16(D)(4) Splices and Taps.
505.16(D)(5) Conductor or Optical Fiber Fill.
505.16(E) Drainage. 505.16(E)(1) Control Equipment.
505.16(E)(2) Motors and Generators.
505.17 Flexible Cables, Cords and Connections. 505.17(A) Flexible Cords, Zones 1 and 2.
505.17(B) Instrumentation Connections for Zone 2. <\/td>\n<\/tr>\n
492<\/td>\n505.18 Conductors and Conductor Insulation. 505.18(A) Conductors.
505.18(B) Conductor Insulation.
505.19 Uninsulated Exposed Parts.
505.20 Equipment Requirements. 505.20(A) Zone 0.
505.20(B) Zone 1.
505.20(C) Zone 2.
505.20(D) Materials.
505.20(E) Manufacturer\u2019s Instructions.
505.22 Increased Safety \u201ce\u201d Motors and Generators. <\/td>\n<\/tr>\n
493<\/td>\n505.25 Grounding and Bonding.
505.25(A) Bonding.
505.25(B) Types of Equipment Grounding Conductors.
505.26 Process Sealing.
ARTICLE 506 Zone 20, 21, and 22 Locations for Combustible Dusts or Ignitible Fibers\/Flyings 506.1 Scope.
506.3 Other Articles. <\/td>\n<\/tr>\n
494<\/td>\n506.4 Documentation.
506.5 Classification of Locations. 506.5(A) Classifications of Locations.
506.5(B) Zone 20, Zone 21, and Zone 22 Locations.
506.5(B)(1) Zone 20.
506.5(B)(2) Zone 21.
506.5(B)(3) Zone 22. <\/td>\n<\/tr>\n
495<\/td>\n506.6 Material Groups.
506.6(A) Group IIIC.
506.6(B) Group IIIB.
506.6(C) Group IIIA.
506.7 Special Precaution.
506.7(A) Implementation of Zone Classification System.
506.7(B) Dual Classification.
506.7(C) Reclassification Permitted.
506.7(D) Simultaneous Presence of Flammable Gases and Combustible Dusts or Fibers\/Flyings.
506.8 Protection Techniques.
506.8(A) Dust Ignitionproof.
506.8(B) Pressurized.
506.8(C) Intrinsic Safety.
506.8(D) Dusttight.
506.8(E) Protection by Encapsulation \u201cm\u201d.
506.8(F) Nonincendive Equipment.
506.8(G) Protection by Enclosure \u201ct\u201d. <\/td>\n<\/tr>\n
496<\/td>\n506.8(H) Protection by Pressurized Enclosure \u201cp\u201d.
506.8(I) Protection by Intrinsic Safety \u201ci\u201d.
506.8(J) Protection by Electrical Resistance Trace Heating \u201c60079-30-1\u201d.
506.8(K) Inherently Safe Optical Radiation \u201cop is\u201d.
506.8(L) Protected Optical Radiation \u201cop pr\u201d.
506.8(M) Optical System with Interlock \u201cop sh\u201d.
506.8(N) Protection by Skin Effect Trace Heating \u201cIEEE 844.1\u201d.
506.9 Equipment Requirements. 506.9(A) Suitability.
506.9(B) Listing.
506.9(C) Marking. 506.9(C)(1) Division Equipment.
506.9(C)(2) Zone Equipment. <\/td>\n<\/tr>\n
498<\/td>\n506.9(D) Temperature Classifications.
506.9(E) Threading.
506.9(E)(1) Equipment Provided with Threaded Entries for NPT-Threaded Conduit or Fittings.
506.9(E)(2) Equipment Provided with Threaded Entries for Metric-Threaded Fittings.
506.9(E)(3) Unused Openings.
506.9(F) Optical Fiber Cables.
506.9(G) Equipment Involving Optical Radiation.
506.15 Wiring Methods.
506.15(A) Zone 20. <\/td>\n<\/tr>\n
499<\/td>\n506.15(B) Zone 21.
506.15(C) Zone 22.
506.16 Sealing.
506.17 Flexible Cords.
506.20 Equipment Installation. 506.20(A) Zone 20.
506.20(B) Zone 21.
506.20(C) Zone 22. <\/td>\n<\/tr>\n
500<\/td>\n506.20(D) Material Group.
506.20(E) Manufacturer’s Instructions.
506.20(F) Temperature.
506.25 Grounding and Bonding.
506.25(A) Bonding.
506.25(B) Types of Equipment Grounding Conductors.
ARTICLE 510 Hazardous (Classified) Locations \u2014 Specific 510.1 Scope.
510.2 General.
ARTICLE 511 Commercial Garages, Repair and Storage 511.1 Scope.
511.3 Area Classification, General. <\/td>\n<\/tr>\n
501<\/td>\n511.3(A) Parking Garages.
511.3(B) Repair Garages, with Dispensing.
511.3(C) Repair Garages, Major and Minor.
511.3(D) Repair Garages, Major. <\/td>\n<\/tr>\n
502<\/td>\n511.3(E) Modifications to Classification. 511.3(E)(1) Specific Areas Adjacent to Classified Locations.
511.3(E)(2) Alcohol-Based Windshield Washer Fluid.
511.4 Wiring and Equipment in Class I Locations. 511.4(A) Wiring Located in Class I Locations.
511.4(B) Equipment Located in Class I Locations.
511.4(B)(1) Fuel-Dispensing Units.
511.4(B)(2) Portable Lighting Equipment.
511.7 Wiring and Equipment Installed Above Class I Locations. 511.7(A) Wiring in Spaces Above Class I Locations. 511.7(A)(1) Fix
511.7(A)(2) Pendant.
511.7(B) Electrical Equipment Installed Above Class I Locations. 511.7(B)(1) Fixed Electrical Equipment.
511.8 Underground Wiring Below Class I Locations. 2 3 <\/td>\n<\/tr>\n
503<\/td>\n511.9 Sealing.
511.10 Special Equipment. 511.10(A) Battery Charging Equipment.
511.10(B) Electric Vehicle Charging Equipment. 511.10(B)(1) General.
511.10(B)(2) Connector Location.
511.10(B)(3) Plug Connections to Vehicles.
511.12 Ground-Fault Circuit-Interrupter Protection for Personnel.
511.16 Grounding and Bonding Requirements. 511.16(A) General Grounding Requirements.
511.16(B) Supplying Circuits with Grounded and Grounding Conductors in Class I Locations.
511.16(B)(1) Circuits Supplying Portable Equipment or Pendants.
511.16(B)(2) Approved Means.
ARTICLE 513 Aircraft Hangars 513.1 Scope.
513.3 Classification of Locations.
513.3(A) Below Floor Level.
513.3(B) Areas Not Cut Off or Ventilated. <\/td>\n<\/tr>\n
504<\/td>\n513.3(C) Vicinity of Aircraft. 513.3(C)(1) Aircraft Maintenance and Storage Hangars.
513.3(C)(2) Aircraft Painting Hangars.
513.3(D) Areas Suitably Cut Off and Ventilated.
513.4 Wiring and Equipment in Class I Locations. 513.4(A) General.
513.4(B) Stanchions, Rostrums, and Docks.
513.7 Wiring and Equipment Not Installed in Class I Locations. 513.7(A) Fixed Wiring.
513.7(B) Pendants.
513.7(C) Arcing Equipment.
513.7(D) Lampholders.
513.7(E) Stanchions, Rostrums, or Docks.
513.7(F) Mobile Stanchions.
513.8 Underground Wiring. 513.8(A) Wiring and Equipment Embedded, Under Slab, or Underground.
513.8(B) Uninterrupted Raceways, Embedded, Under Slab, or Underground. <\/td>\n<\/tr>\n
505<\/td>\n513.9 Sealing.
513.10 Special Equipment. 513.10(A) Aircraft Electrical Systems. 513.10(A)(1) De-energizing Aircraft Electrical Systems.
513.10(A)(2) Aircraft Batteries.
513.10(B) Aircraft Battery Charging and Equipment.
513.10(C) External Power Sources for Energizing Aircraft. 513.10(C)(1) Not Less Than 450 mm (18 in.) Above Floor.
513.10(C)(2) Marking for Mobile Units.
513.10(C)(3) Cords.
513.10(D) Mobile Servicing Equipment with Electrical Components. 513.10(D)(1) General.
513.10(D)(2) Cords and Connectors. <\/td>\n<\/tr>\n
506<\/td>\n513.10(D)(3) Restricted Use.
513.10(E) Portable Equipment. 513.10(E)(1) Portable Lighting Equipment.
513.10(E)(2) Portable Utilization Equipment.
513.12 Ground-Fault Circuit-Interrupter Protection for Personnel.
513.16 Grounding and Bonding Requirements. 513.16(A) General Grounding Requirements.
513.16(B) Supplying Circuits with Grounded and Equipment Grounding Conductors in Class I Locations. 513.16(B)(1) Circuits Supply
513.16(B)(2) Approved Means.
ARTICLE 514 Motor Fuel Dispensing Facilities 514.1 Scope.
514.3 Classification of Locations.
Figure 514.3 Classified Areas Adjacent to Dispensers. [30A: Figure 8.3.2(a)] <\/td>\n<\/tr>\n
507<\/td>\n514.3(A) Unclassified Locations.
514.3(B) Classified Locations.
Figure 514.3(B) Classified Areas Adjacent to Dispenser Mounted on Aboveground Storage Tank. [30A: Figure 8.3.2(b)] <\/td>\n<\/tr>\n
508<\/td>\n1
514.3(B)(1) Class I Locations. <\/td>\n<\/tr>\n
510<\/td>\n514.3(B)(2) Compressed Natural Gas, Liquefied Natural Gas, and Liquefied Petroleum Gas Areas.
514.3(B)(3) Fuel Storage. <\/td>\n<\/tr>\n
511<\/td>\n514.3(C) Motor Fuel Dispensing Stations in Boatyards and Marinas.
514.3(C)(1) General.
514.3(C)(2) Classification of Class I, Division 1 and 2 Areas.
514.3(D) Closed Construction.
514.3(E) Open Construction.
514.4 Wiring and Equipment Installed in Class I Locations.
514.7 Wiring and Equipment Above Class I Locations.
514.8 Underground Wiring. <\/td>\n<\/tr>\n
512<\/td>\n514.9 Sealing. 514.9(A) At Dispenser.
514.9(B) At Boundary.
514.11 Circuit Disconnects. 514.11(A) Emergency Electrical Disconnects.
514.11(B) Attended Self-Service Motor Fuel Dispensing Facilities.
514.11(C) Unattended Self-Service Motor Fuel Dispensing Facilities.
514.13 Provisions for Maintenance and Service of Dispensing Equipment.
514.16 Grounding and Bonding.
ARTICLE 515 Bulk Storage Plants 515.1 Scope.
515.3 Classified Locations. <\/td>\n<\/tr>\n
514<\/td>\nFigure 515.3 Area Classification for a Marine Terminal Handling Flammable Liquids. [30:Figure 29.3.22] <\/td>\n<\/tr>\n
515<\/td>\n515.4 Wiring and Equipment Located in Class I Locations.
515.7 Wiring and Equipment Above Class I Locations. 515.7(A) Fixed Wiring.
515.7(B) Fixed Equipment.
515.7(C) Portable Luminaires or Other Utilization Equipment.
515.8 Underground Wiring. 515.8(A) Wiring Method.
515.8(B) Insulation.
515.8(C) Nonmetallic Wiring.
515.9 Sealing. <\/td>\n<\/tr>\n
516<\/td>\n515.10 Special Equipment \u2014 Gasoline Dispensers.
515.16 Grounding and Bonding.
ARTICLE 516 Spray Application, Dipping, Coating, and Printing Processes Using Flammable or Combustible Materials Part I. General
516.3 Class I Locations.
Part II. Open Containers 516.4 Area Classification.
Figure 516.4 Electrical Area Classification for Class I Liquid Operations Around Open Containers, Supply Containers, Waste Conta <\/td>\n<\/tr>\n
517<\/td>\nPart III. Spray Application Processes 516.5 Area Classification.
516.5(A) Zone Classification of Locations. 516.5(A)(1) Classification of Locations.
516.5(A)(2) Classification Systems. <\/td>\n<\/tr>\n
518<\/td>\n516.5(A)(3) Equipment.
516.5(B) Class I, Division 1 or Class I, Zone 0 Locations.
516.5(C) Class I, Division 1; Class I, Zone 1; Class II, Division 1; or Zone 21 Locations.
516.5(D) Class I, Division 2; Class I, Zone 2; Class II, Division 2; or Zone 22 Locations.
516.5(D)(1) Unenclosed Spray Processes.
Figure 516.5(D)(1) Electrical Area Classification for Unenclosed Spray Areas. [33:Figure 6.5.1] <\/td>\n<\/tr>\n
519<\/td>\n516.5(D)(2) Closed-Top, Open-Face, and Open-Front Spray Booths and Spray Rooms.
Figure 516.5(D)(2) Class I, Division 2; Class I, Zone 2; Class II, Division 2; or Zone 22 Locations Adjacent to a Closed Top, Op <\/td>\n<\/tr>\n
520<\/td>\n516.5(D)(3) Open-Top Spray Booths.
516.5(D)(4) Enclosed Spray Booths and Spray Rooms.
516.5(D)(5) Limited Finishing Workstations. <\/td>\n<\/tr>\n
521<\/td>\nFigure 516.5(D)(4) Class I, Division 2; Class I, Zone 2; Class II, Division 2; or Zone 22 Locations Adjacent to an Enclosed Spra <\/td>\n<\/tr>\n
522<\/td>\nFigure 516.5(D)(5) Class I, Division 2; Class I, Zone 2; Class II, Division 2; or Zone 22 Locations Adjacent to a Limited Finish <\/td>\n<\/tr>\n
523<\/td>\n516.6 Wiring and Equipment in Class I Locations. 516.6(A) Wiring and Equipment \u2014 Vapors.
516.6(B) Wiring and Equipment \u2014 Vapors and Residues.
516.6(C) Illumination. <\/td>\n<\/tr>\n
524<\/td>\nFigure 516.6(C)(a) Example of a Luminaire that is Mounted Outside of the Spray Area and is Serviced from Outside the Spray Area. <\/td>\n<\/tr>\n
526<\/td>\n516.6(D) Portable Equipment.
516.6(E) Electrostatic Equipment.
516.6(F) Static Electric Discharges.
516.7 Wiring and Equipment Not Within Classified Locations. 516.7(A) Wiring.
516.7(B) Equipment.
516.10 Special Equipment. 516.10(A) Fixed Electrostatic Equipment.
516.10(A)(1) Power and Control Equipment.
516.10(A)(2) Electrostatic Equipment.
516.10(A)(3) High-Voltage Leads.
516.10(A)(4) Support of Goods. <\/td>\n<\/tr>\n
527<\/td>\n516.10(A)(5) Automatic Controls.
516.10(A)(6) Grounding.
516.10(A)(7) Isolation.
516.10(A)(8) Signs.
516.10(A)(9) Insulators.
516.10(A)(10) Other Than Nonincendive Equipment.
516.10(B) Hand-Spraying Electrostatic Equipment.
516.10(B)(1) General.
516.10(B)(2) Power Equipment.
516.10(B)(3) Handle.
516.10(B)(4) Electrostatic Equipment.
516.10(B)(5) Support of Objects.
516.10(C) Powder Coating. <\/td>\n<\/tr>\n
528<\/td>\n516.10(C)(1) Electrical Equipment and Sources of Ignition.
516.10(C)(2) Fixed Electrostatic Spraying Equipment.
516.10(C)(3) Electrostatic Hand-Spraying Equipment.
516.10(C)(4) Electrostatic Fluidized Beds.
516.16 Grounding.
Part IV. Spray Application Operations in Membrane Enclosures 516.18 Area Classification for Temporary Membrane Enclosures.
Figure 516.18 Electrical Classifications for Temporary Outdoor Membrane Enclosures [33:Figure 18.7.1.1] <\/td>\n<\/tr>\n
529<\/td>\n516.23 Electrical and Other Sources of Ignition.
Part V. Printing, Dipping, and Coating Processes 516.29 Classification of Locations. <\/td>\n<\/tr>\n
530<\/td>\nFigure 516.29(a) Electrical Area Classification for Open Dipping and Coating Processes Without Vapor Containment or Ventilation. <\/td>\n<\/tr>\n
531<\/td>\nFigure 516.29(c) Electrical Area Classification for Open Dipping and Coating Processes with Partial Peripheral Vapor Containment <\/td>\n<\/tr>\n
532<\/td>\nFigure 516.29(d) Electrical Area Classification for a Typical Printing Process. [34:Figure 6.4(d)] <\/td>\n<\/tr>\n
533<\/td>\n516.35 Areas Adjacent to Enclosed Dipping and Coating Processes.
Figure 516.35 Electrical Area Classification Around Enclosed Dipping and Coating Processes. [34:Figure 6.5] <\/td>\n<\/tr>\n
534<\/td>\n516.36 Equipment and Containers in Ventilated Areas.
516.37 Luminaires.
516.38 Wiring and Equipment Not Within Classified Locations. 516.38(A) Wiring. <\/td>\n<\/tr>\n
535<\/td>\n516.38(B) Equipment.
516.40 Static Electric Discharges.
ARTICLE 517 Health Care Facilities Part I. General 517.1 Scope.
517.2 Definitions.
Alternate Power Source.
Ambulatory Health Care Occupancy.
Anesthetizing Location.
Battery-Powered Lighting Units.
Critical Branch.
Dental Office. <\/td>\n<\/tr>\n
536<\/td>\nElectrical Life-Support Equipment.
Equipment Branch.
Essential Electrical System.
Exposed Conductive Surfaces.
Fault Hazard Current.
Flammable Anesthetics.
Flammable Anesthetizing Location.
Hazard Current.
Fault Hazard Current.
Monitor Hazard Current.
Total Hazard Current.
Health Care Facilities.
Health Care Facility\u2019s Governing Body.
Hospital.
Invasive Procedure.
Isolated Power System.
Isolation Transformer. <\/td>\n<\/tr>\n
537<\/td>\nLife Safety Branch.
Limited Care Facility.
Line Isolation Monitor.
Medical Office.
Monitor Hazard Current.
Nurses\u2019 Stations.
Nursing Home.
Patient Bed Location.
Patient Care Space.
Category 1 (Critical Care) Space.
Category 2 (General Care) Space.
Category 3 (Basic Care) Space.
Category 4 (Support) Space. <\/td>\n<\/tr>\n
538<\/td>\nPatient Care Vicinity.
Patient Equipment Grounding Point.
Psychiatric Hospital.
Reference Grounding Point.
Relative Analgesia.
Selected Receptacles.
Task Illumination.
Wet Procedure Location.
X-Ray Installations, Long-Time Rating.
X-Ray Installations, Mobile.
X-Ray Installations, Momentary Rating.
X-Ray Installations, Portable.
X-Ray Installations, Transportable.
Part II. Wiring and Protection 517.10 Applicability. 517.10(A) Applicability.
517.10(B) Not Covered. <\/td>\n<\/tr>\n
539<\/td>\n517.11 General Installation \u2014 Construction Criteria.
517.12 Wiring Methods.
517.13 Equipment Grounding Conductor for Receptacles and Fixed Electrical Equipment in Patient Care Spaces.
517.13(A) Wiring Methods.
517.13(B) Insulated Equipment Grounding Conductors and Insulated Equipment Bonding Jumpers. 517.13(B)(1) General.
517.13(B)(2) Sizing.
517.14 Panelboard Bonding.
517.16 Use of Isolated Ground Receptacles.
517.16(A) Inside of a Patient Care Vicinity.
517.16(B) Outside of a Patient Care Vicinity.
517.16(B)(1)
517.16(B)(2) <\/td>\n<\/tr>\n
540<\/td>\n517.17 Ground-Fault Protection of Equipment. 517.17(A) Applicability.
517.17(B) Feeders.
517.17(C) Selectivity.
517.17(D) Testing.
517.18 Category 2 (General Care) Spaces. 517.18(A) Patient Bed Location.
517.18(B) Patient Bed Location Receptacles. 517.18(B)(1) Minimum Number and Supply.
517.18(B)(2) Receptacle Requirements.
517.18(C) Designated Category 2 (General Care) Pediatric Locations.
517.19 Category 1 (Critical Care) Spaces. 517.19(A) Patient Bed Location Branch Circuits. <\/td>\n<\/tr>\n
541<\/td>\n517.19(B) Patient Bed Location Receptacles. 517.19(B)(1) Minimum Number and Supply.
517.19(B)(2) Receptacle Requirements.
517.19(C) Operating Room Receptacles. 517.19(C)(1) Minimum Number and Supply.
517.19(C)(2) Receptacle Requirements.
517.19(D) Patient Care Vicinity Grounding and Bonding (Optional).
517.19(E) Equipment Grounding and Bonding.
517.19(F) Additional Protective Techniques in Category 1 (Critical Care) Spaces (Optional).
517.19(G) Isolated Power System Equipment Grounding.
517.19(H) Special-Purpose Receptacle Grounding.
517.20 Wet Procedure Locations. <\/td>\n<\/tr>\n
542<\/td>\n517.20(A) Receptacles and Fixed Equipment.
517.20(B) Isolated Power Systems.
517.21 Ground-Fault Circuit-Interrupter Protection for Personnel in Category 2 (General Care) and Category 1 (Critical Care) Spa
Part III. Essential Electrical System (EES) 517.25 Essential Electrical Systems for Health Care Facilities.
517.26 Application of Other Articles.
517.29 Type 1 Essential Electrical Systems.
517.29(A) Applicability.
517.29(B) Type 1 Essential Electrical Systems. <\/td>\n<\/tr>\n
543<\/td>\n517.30 Sources of Power. 517.30(A) Two Independent Power Sources.
517.30(B) Types of Power Sources. 517.30(B)(1) Generating Units.
517.30(B)(2) Fuel Cell Systems.
517.30(B)(3) Battery Systems.
517.30(C) Location of Essential Electrical System Components.
517.30(C)(1) Services.
517.30(C)(2) Feeders.
517.31 Requirements for the Essential Electrical System. 517.31(A) Separate Branches.
517.31(B) Transfer Switches.
Informational Note Figure 517.31(a) Type 1 Essential Electrical System \u2014 Minimum Requirement (greater than 150 kVA) for Transfer <\/td>\n<\/tr>\n
544<\/td>\nInformational Note Figure 517.31(b) Type 1 Essential Electrical System \u2014 Minimum Requirement (150 kVA or less) for Transfer Swit
517.31(B)(2) Contiguous Facilities.
517.31(C) Wiring Requirements. 517.31(C)(1) Separation from Other Circuits. <\/td>\n<\/tr>\n
545<\/td>\n517.31(C)(2) Isolated Power Systems.
517.31(C)(3) Mechanical Protection of the Essential Electrical System.
517.31(D) Capacity of Systems.
517.31(E) Receptacle Identification.
517.31(F) Feeders from Alternate Power Source.
517.31(G) Coordination.
517.32 Branches Requiring Automatic Connection. <\/td>\n<\/tr>\n
546<\/td>\n517.32(A) Life Safety and Critical Branch Used in a Type 1 EES.
517.32(B) Life Safety and Critical Branch Used in a Type 2 EES.
517.33 Life Safety Branch.
517.33(A) Illumination of Means of Egress.
517.33(B) Exit Signs.
517.33(C) Alarm and Alerting Systems.
517.33(D) Communications Systems.
517.33(E) Generator Set Locations.
517.33(F) Generator Set Accessories.
517.33(G) Elevators.
517.33(H) Automatic Doors.
517.34 Critical Branch. 517.34(A) Task Illumination, Fixed Equipment, and Selected Receptacles. <\/td>\n<\/tr>\n
547<\/td>\n517.34(B) Switching.
517.34(C) Subdivision of the Critical Branch.
517.35 Equipment Branch Connection to Alternate Power Source.
517.35(A) Equipment for Delayed Automatic Connection.
517.35(B) Equipment for Delayed Automatic or Manual Connection. <\/td>\n<\/tr>\n
548<\/td>\n517.40 Type 2 Essential Electrical Systems.
517.40(A) Applicability.
517.40(B) Category 1 (Critical Care) Spaces, Inpatient Hospital Care Facilities.
517.40(C) Facilities Contiguous or Located on the Same Site with Hospitals.
517.41 Required Power Sources. 517.41(A) Two Independent Power Sources.
517.41(B) Types of Power Sources.
517.41(C) Location of Essential Electrical System Components.
517.42 Essential Electrical Systems for Nursing Homes and Limited Care Facilities. 517.42(A) General. <\/td>\n<\/tr>\n
549<\/td>\n517.42(B) Transfer Switches.
Informational Note Figure 517.42(a) Type 2 Essential Electrical Systems (Nursing Home and Limited Health Care Facilities) \u2014 Mini <\/td>\n<\/tr>\n
550<\/td>\nInformational Note Figure 517.42(b) Type 2 Essential Electrical Systems (Nursing Home and Limited Health Care Facilities) \u2014 Mini <\/td>\n<\/tr>\n
551<\/td>\n517.42(C) Capacity of System.
517.42(D) Separation from Other Circuits.
517.42(E) Receptacle Identification.
517.43 Automatic Connection to Life Safety and Equipment Branch. <\/td>\n<\/tr>\n
552<\/td>\n517.43(A) Illumination of Means of Egress.
517.43(B) Exit Signs.
517.43(C) Alarm and Alerting Systems.
517.43(D) Communications Systems.
517.43(E) Generator Set Location.
517.43(F) Elevators.
517.43(G) AC Equipment for Nondelayed Automatic Connection.
517.44 Connection to Equipment Branch.
517.44(A) Delayed Automatic Connections to Equipment Branch.
517.44(B) Delayed Automatic or Manual Connection to the Equipment Branch. <\/td>\n<\/tr>\n
553<\/td>\n517.45 Essential Electrical Systems for Other Health Care Facilities. 517.45(A) Essential Electrical Distribution.
517.45(B) Electrical Life Support Equipment.
517.45(C) Category 1 (Critical Care) Patient Care Spaces.
517.45(D) Category 2 (General Care) Patient Care Spaces.
517.45(E) Power Systems.
Part IV. Inhalation Anesthetizing Locations
517.60 Anesthetizing Location Classification.
517.60(A) Hazardous (Classified) Location. 517.60(A)(1) Use Location.
517.60(A)(2) Storage Location.
517.60(B) Unclassified Location.
517.61 Wiring and Equipment. 517.61(A) Within Hazardous (Classified) Anesthetizing Locations. 517.61(A)(1) Isolation.
517.61(A)(2) Design and Installation.
517.61(A)(3) Equipment Operating at More Than 10 Volts.
517.61(A)(4) Extent of Location.
517.61(A)(5) Receptacles and Attachment Plugs. <\/td>\n<\/tr>\n
554<\/td>\n517.61(A)(6) Flexible Cord Type.
517.61(A)(7) Flexible Cord Storage.
517.61(B) Above Hazardous (Classified) Anesthetizing Locations. 517.61(B)(1) Wiring Methods.
517.61(B)(2) Equipment Enclosure.
517.61(B)(3) Luminaires.
517.61(B)(4) Seals.
517.61(B)(5) Receptacles and Attachment Plugs.
517.61(B)(6) 250-Volt Receptacles and Attachment Plugs Rated 50 and 60 Amperes.
517.61(C) Unclassified Anesthetizing Locations. 517.61(C)(1) Wiring Methods.
517.61(C)(2) Receptacles and Attachment Plugs.
517.61(C)(3) 250-Volt Receptacles and Attachment Plugs Rated 50 Amperes and 60 Amperes.
517.62 Grounding.
517.63 Grounded Power Systems in Anesthetizing Locations. 517.63(A) Battery-Powered Lighting Units.
517.63(B) Branch-Circuit Wiring. <\/td>\n<\/tr>\n
555<\/td>\n517.63(C) Fixed Lighting Branch Circuits.
517.63(D) Remote-Control Stations.
517.63(E) Location of Isolated Power Systems.
517.63(F) Circuits in Anesthetizing Locations.
517.64 Low-Voltage Equipment and Instruments. 517.64(A) Equipment Requirements.
517.64(B) Power Supplies.
517.64(C) Isolated Circuits.
517.64(D) Controls.
517.64(E) Battery-Powered Appliances.
517.64(F) Receptacles or Attachment Plugs.
Part V. X-Ray Installations 517.70 Applicability. <\/td>\n<\/tr>\n
556<\/td>\n517.71 Connection to Supply Circuit. 517.71(A) Fixed and Stationary Equipment.
517.71(B) Portable, Mobile, and Transportable Equipment.
517.71(C) Over 1000-Volt Supply.
517.72 Disconnecting Means. 517.72(A) Capacity.
517.72(B) Location.
517.72(C) Portable Equipment.
517.73 Rating of Supply Conductors and Overcurrent Protection. 517.73(A) Diagnostic Equipment. 517.73(A)(1) Branch Circuits.
517.73(A)(2) Feeders.
517.73(B) Therapeutic Equipment.
517.74 Control Circuit Conductors. 517.74(A) Number of Conductors in Raceway.
517.74(B) Minimum Size of Conductors.
517.75 Equipment Installations.
517.76 Transformers and Capacitors.
517.77 Installation of High-Tension X-Ray Cables. <\/td>\n<\/tr>\n
557<\/td>\n517.78 Guarding and Grounding. 517.78(A) High-Voltage Parts.
517.78(B) Low-Voltage Cables.
517.78(C) Non\u2013Current-Carrying Metal Parts.
Part VI. Communications, Signaling Systems, Data Systems, Fire Alarm Systems, and Systems Less Than 120 Volts, Nominal 517.80 Pa
517.81 Other-Than-Patient-Care Spaces.
517.82 Signal Transmission Between Appliances. 517.82(A) General.
517.82(B) Common Signal Grounding Wire.
Part VII. Isolated Power Systems 517.160 Isolated Power Systems. 517.160(A) Installations. 517.160(A)(1) Isolated Power Circuits
517.160(A)(2) Circuit Characteristics.
517.160(A)(3) Equipment Location.
517.160(A)(4) Isolation Transformers.
517.160(A)(5) Conductor Identification. <\/td>\n<\/tr>\n
558<\/td>\n517.160(A)(6) Wire-Pulling Compounds.
517.160(B) Line Isolation Monitor. 517.160(B)(1) Characteristics.
517.160(B)(2) Impedance.
517.160(B)(3) Ammeter.
ARTICLE 518 Assembly Occupancies 518.1 Scope.
518.2 General Classification. 518.2(A) Examples. <\/td>\n<\/tr>\n
559<\/td>\n518.2(B) Multiple Occupancies.
518.2(C) Theatrical Areas.
518.3 Other Articles. 518.3(A) Hazardous (Classified) Areas.
518.3(B) Temporary Wiring.
518.3(C) Emergency Systems.
518.4 Wiring Methods. 518.4(A) General.
518.4(B) Nonrated Construction.
518.4(C) Spaces with Finish Rating. <\/td>\n<\/tr>\n
560<\/td>\n518.5 Supply.
518.6 Illumination.
ARTICLE 520 Theaters, Audience Areas of Motion Picture and Television Studios, Performance Areas, and Similar Locations Part I.
520.2 Definitions.
Adapter.
Border Light.
Breakout Assembly.
Bundled.
Connector Strip.
Drop Box.
Footlight.
Grouped.
Performance Area.
Portable Equipment.
Portable Power Distribution Unit. <\/td>\n<\/tr>\n
561<\/td>\nProscenium.
Solid-State Phase-Control Dimmer.
Solid-State Sine Wave Dimmer.
Stage Equipment.
Stage Lighting Hoist.
Stage Switchboard.
Stage Switchboard, Portable.
Stand Lamp (Work Light).
Strip Light.
Two-Fer.
520.3 Motion Picture Projectors.
520.4 Audio Signal Processing, Amplification, and Reproduction Equipment.
520.5 Wiring Methods. 520.5(A) General.
520.5(B) Portable Equipment.
520.5(C) Nonrated Construction.
520.6 Number of Conductors in Raceway.
520.7 Enclosing and Guarding Live Parts.
520.8 Emergency Systems. <\/td>\n<\/tr>\n
562<\/td>\n520.9 Branch Circuits.
520.10 Portable Equipment Used Outdoors.
Part II. Fixed Stage Switchboards 520.21 General.
520.25 Dimmers.
520.25(A) Disconnection and Overcurrent Protection.
520.25(B) Autotransformer-Type Dimmers.
520.25(C) Solid-State-Type Dimmers.
520.26 Type of Switchboard.
520.26(A) Manual.
520.26(B) Remotely Controlled.
520.26(C) Intermediate.
520.26(D) Constant Power.
520.27 Stage Switchboard Feeders. 520.27(A) Type of Feeder.
520.27(A)(1) Single Feeder.
520.27(A)(2) Multiple Feeders to Intermediate Stage Switchboard (Patch Panel).
520.27(A)(3) Separate Feeders to Single Primary Stage Switchboard (Dimmer Bank). <\/td>\n<\/tr>\n
563<\/td>\n520.27(B) Neutral Conductor.
520.27(C) Supply Capacity.
Part III. Fixed Stage Equipment Other Than Switchboards 520.40 Stage Lighting Hoists.
520.41 Circuit Loads. 520.41(A) Circuits Rated 20 Amperes or Less.
520.41(B) Circuits Rated Greater Than 20 Amperes.
520.42 Conductor Insulation.
520.43 Footlights. 520.43(A) Metal Trough Construction.
520.43(B) Other-Than-Metal Trough Construction.
520.43(C) Disappearing Footlights.
520.44 Borders, Proscenium Sidelights, Drop Boxes, and Connector Strips. 520.44(A) General.
520.44(B) Connector Strips and Drop Boxes.
520.44(C) Cords and Cables for Border Lights, Drop Boxes, and Connector Strips. <\/td>\n<\/tr>\n
564<\/td>\n520.44(C)(1) General.
520.44(C)(2) Cords and Cables Not in Contact with Heat-Producing Equipment.
520.44(C)(3) Identification of Conductors in Multiconductor Extra-Hard-Usage Cords and Cables.
520.45 Receptacles. <\/td>\n<\/tr>\n
565<\/td>\n520.46 Connector Strips, Drop Boxes, Floor Pockets, and Other Outlet Enclosures.
520.47 Backstage Lamps (Bare Bulbs).
520.48 Curtain Machines.
520.49 Smoke Ventilator Control.
Part IV. Portable Switchboards on Stage 520.50 Road Show Connection Panel (A Type of Patch Panel).
520.50(A) Load Circuits.
520.50(B) Circuit Transfer.
520.50(C) Overcurrent Protection.
520.50(D) Enclosure.
520.51 Supply.
520.52 Overcurrent Protection for Branch Circuits.
520.53 Construction.
520.53(A) Pilot Light.
520.53(B) Neutral Terminal.
520.53(C) Single-Pole Separable Connectors. <\/td>\n<\/tr>\n
566<\/td>\n520.53(D) Supply Feed-Through.
520.53(E) Interior Conductors.
520.54 Supply Conductors. 520.54(A) General.
520.54(B) Conductor Sizing.
520.54(C) Single-Conductor Cables.
520.54(D) Supply Conductors Not Over 3 m (10 ft) Long.
520.54(E) Supply Conductors Not Over 6 m (20 ft) Long.
520.54(F) Supply Conductors Not Reduced in Size.
520.54(G) Protection of Supply Conductors and Connectors.
520.54(H) Number of Supply Interconnections.
520.54(I) Single-Pole Separable Connectors. <\/td>\n<\/tr>\n
567<\/td>\n520.54(J) Supply Neutral Conductor.
520.54(J)(1) Marking.
520.54(J)(2) Conductor Sizing.
520.54(K) Qualified Personnel.
Part V. Portable Stage Equipment Other Than Switchboards 520.61 Arc Lamps.
520.62 Portable Power Distribution Units.
520.62(A) Enclosure.
520.62(B) Receptacles and Overcurrent Protection.
520.62(C) Busbars and Terminals.
520.62(D) Flanged Surface Inlets.
520.62(E) Cable Arrangement.
520.62(F) Single-Conductor Feeders.
520.63 Bracket Fixture Wiring. 520.63(A) Bracket Wiring.
520.63(B) Mounting.
520.64 Portable Strips.
520.65 Festoons. <\/td>\n<\/tr>\n
568<\/td>\n520.66 Special Effects.
520.67 Multipole Branch-Circuit Cable Connectors.
520.68 Conductors for Portables. 520.68(A) Conductor Type. 520.68(A)(1) General.
520.68(A)(2) Protected Applications.
520.68(A)(3) Stand Lamps.
520.68(A)(4) Luminaire Supply Cords.
520.68(A)(5) High-Temperature Applications.
520.68(A)(6) Breakouts.
520.68(B) Conductor Ampacity.
520.68(C) Overcurrent Protection.
520.69 Adapters.
520.69(A) No Reduction in Current Rating. <\/td>\n<\/tr>\n
569<\/td>\n520.69(B) Connectors.
520.69(C) Conductor Type.
Part VI. Dressing Rooms, Dressing Areas, and Makeup Areas. 520.71 Pendant Lampholders.
520.72 Lamp Guards.
520.73 Switches Required.
520.74 Pilot Lights Required.
Part VII. Equipment Grounding Conductor 520.81 Equipment Grounding Conductor.
ARTICLE 522 Control Systems for Permanent Amusement Attractions Part I. General 522.1 Scope.
522.2 Definitions.
Entertainment Device.
Permanent Amusement Attraction.
Ride Device.
522.5 Voltage Limitations.
522.7 Maintenance.
Part II. Control Circuits 522.10 Power Sources for Control Circuits. 522.10(A) Power-Limited Control Circuits. <\/td>\n<\/tr>\n
570<\/td>\n522.10(A)(1) Control Transformers.
522.10(A)(2) Other Power-Limited Control Power Sources.
522.10(B) Non\u2013Power-Limited Control Circuits.
522.10(B)(1) Control Transformers.
522.10(B)(2) Other Non\u2013Power-Limited Control Power Sources.
Part III. Control Circuit Wiring Methods 522.20 Conductors, Busbars, and Slip Rings.
522.21 Conductor Sizing. 522.21(A) Conductors Within a Listed Component or Assembly.
522.21(B) Conductors Within an Enclosure or Operator Station.
522.21(C) Conductors Outside of an Enclosure or Operator Station.
522.22 Conductor Ampacity. <\/td>\n<\/tr>\n
571<\/td>\n522.23 Overcurrent Protection for Conductors.
522.24 Conductors of Different Circuits in the Same Cable, Cable Tray, Enclosure, or Raceway.
522.24(A) Two or More Control Circuits.
522.24(B) Control Circuits with Power Circuits.
522.24(B)(1) In a Cable, Enclosure, or Raceway.
522.24(B)(2) In Factoryor Field-Assembled Control Centers.
522.24(B)(3) In a Manhole.
522.25 Ungrounded Control Circuits.
522.28 Control Circuits in Wet Locations.
ARTICLE 525 Carnivals, Circuses, Fairs, and Similar Events Part I. General Requirements 525.1 Scope.
525.2 Definitions.
Operator. <\/td>\n<\/tr>\n
572<\/td>\nPortable Structures.
525.3 Other Articles. 525.3(A) Portable Wiring and Equipment.
525.3(B) Permanent Structures.
525.3(C) Audio Signal Processing, Amplification, and Reproduction Equipment.
525.3(D) Attractions Utilizing Pools, Fountains, and Similar Installations with Contained Volumes of Water.
525.5 Overhead Conductor Clearances. 525.5(A) Vertical Clearances.
525.5(B) Clearance to Portable Structures. 525.5(B)(1) 600 Volts (or Less).
525.5(B)(2) Over 600 Volts.
525.6 Protection of Electrical Equipment.
Part II. Power Sources 525.10 Services.
525.10(A) Guarding.
525.10(B) Mounting and Location.
525.11 Multiple Sources of Supply.
Part III. Wiring Methods 525.20 Wiring Methods. 525.20(A) Type.
525.20(B) Single-Conductor.
525.20(C) Open Conductors.
525.20(D) Splices.
525.20(E) Cord Connectors. <\/td>\n<\/tr>\n
573<\/td>\n525.20(F) Support.
525.20(G) Protection.
525.20(H) Boxes and Fittings.
525.21 Rides, Tents, and Concessions. 525.21(A) Disconnecting Means.
525.21(B) Portable Wiring Inside Tents and Concessions.
525.22 Portable Distribution or Termination Boxes.
525.22(A) Construction.
525.22(B) Busbars and Terminals.
525.22(C) Receptacles and Overcurrent Protection.
525.22(D) Single-Pole Connectors.
525.23 Ground-Fault Circuit-Interrupter (GFCI) Protection. 525.23(A) Where GFCI Protection Is Required.
525.23(B) Where GFCI Protection Is Not Required.
525.23(C) Where GFCI Protection Is Not Permitted.
525.23(D) Receptacles Supplied by Portable Cords.
Part IV. Equipment Grounding and Bonding 525.30 Equipment Bonding. <\/td>\n<\/tr>\n
574<\/td>\n525.31 Equipment Grounding.
525.32 Equipment Grounding Conductor Continuity Assurance.
ARTICLE 530 Motion Picture and Television Studios and Similar Locations Part I. General 530.1 Scope.
530.2 Definitions.
Alternating-Current Power Distribution Box (Alternating-Current Plugging Box, Scatter Box).
Bull Switch.
Location (Shooting Location).
Location Board (Deuce Board).
Motion Picture Studio (Lot).
Plugging Box.
Portable Equipment.
Spider (Cable Splicing Block).
Stage Effect (Special Effect).
Stage Property.
Stage Set.
Stand Lamp (Work Light). <\/td>\n<\/tr>\n
575<\/td>\nTelevision Studio or Motion Picture Stage (Sound Stage).
530.6 Portable Equipment.
Part II. Stage or Set 530.11 Permanent Wiring.
530.12 Portable Wiring. 530.12(A) Stage Set Wiring.
530.12(B) Stage Effects and Electrical Equipment Used as Stage Properties.
530.12(C) Other Electrical Equipment.
530.13 Stage Lighting and Effects Control.
530.14 Plugging Boxes.
530.15 Enclosing and Guarding Live Parts. 530.15(A) Live Parts.
530.15(B) Switches.
530.15(C) Rheostats.
530.15(D) Current-Carrying Parts.
530.16 Portable Luminaires.
530.17 Portable Arc Lamps. 530.17(A) Portable Carbon Arc Lamps.
530.17(B) Portable Noncarbon Arc Electric-Discharge Lamps.
530.18 Overcurrent Protection \u2014 General.
530.18(A) Stage Cables. <\/td>\n<\/tr>\n
576<\/td>\n530.18(B) Feeders.
530.18(C) Cable Protection.
530.18(D) Location Boards.
530.18(E) Plugging Boxes.
530.18(F) Alternating-Current Power Distribution Boxes.
530.18(G) Lighting.
530.19 Sizing of Feeder Conductors for Television Studio Sets. 530.19(A) General.
530.19(B) Portable Feeders.
530.20 Equipment Grounding Conductor.
530.21 Plugs and Receptacles. 530.21(A) Rating.
530.21(B) Interchangeability. <\/td>\n<\/tr>\n
577<\/td>\n530.22 Single-Pole Separable Connectors. 530.22(A) General.
530.22(B) Interchangeability.
530.23 Branch Circuits.
Part III. Dressing Rooms 530.31 Dressing Rooms.
Part IV. Viewing, Cutting, and Patching Tables 530.41 Lamps at Tables.
Part V. Cellulose Nitrate Film Storage Vaults 530.51 Lamps in Cellulose Nitrate Film Storage Vaults.
530.52 Electrical Equipment in Cellulose Nitrate Film Storage Vaults.
Part VI. Substations 530.61 Substations.
530.62 Portable Substations.
530.63 Overcurrent Protection of Direct-Current Generators.
530.64 Direct-Current Switchboards. 530.64(A) General.
530.64(B) Circuit Breaker Frames. <\/td>\n<\/tr>\n
578<\/td>\nARTICLE 540 Motion Picture Projection Rooms Part I. General 540.1 Scope.
540.2 Definitions.
Nonprofessional Projector.
Professional-Type Projector.
Part II. Equipment and Projectors of the Professional Type 540.10 Motion Picture Projection Room Required.
540.11 Location of Associated Electrical Equipment. 540.11(A) Motor Generator Sets, Transformers, Rectifiers, Rheostats, and Sim
540.11(A)(1) Types.
540.11(A)(2) Separate Rooms or Housings.
540.11(A)(3) Solid Metal Covers.
540.11(A)(4) Tight Metal Housings.
540.11(A)(5) Upper and Lower Half Enclosures.
540.11(A)(6) Wire Screens or Perforated Metal.
540.11(B) Switches, Overcurrent Devices, or Other Equipment.
540.11(C) Emergency Systems.
540.12 Work Space. <\/td>\n<\/tr>\n
579<\/td>\n540.13 Conductor Size.
540.14 Conductors on Lamps and Hot Equipment.
540.15 Flexible Cords.
540.20 Listing Requirements.
540.21 Marking.
Part III. Nonprofessional Projectors 540.31 Motion Picture Projection Room Not Required.
540.32 Listing Requirements.
Part IV. Audio Signal Processing, Amplification, and Reproduction Equipment 540.50 Audio Signal Processing, Amplification, and R
ARTICLE 545 Manufactured Buildings and Relocatable Structures Part I. General 545.1 Scope.
545.2 Definitions.
Building Component.
Building System.
Closed Construction.
Manufactured Building.
Relocatable Structure. <\/td>\n<\/tr>\n
580<\/td>\n545.4 Wiring Methods. 545.4(A) Methods Permitted.
545.4(B) Securing Cables.
545.5 Supply Conductors.
545.6 Installation of Service-Entrance Conductors.
545.7 Service Equipment.
545.8 Protection of Conductors and Equipment.
545.9 Boxes. 545.9(A) Other Dimensions.
545.9(B) Not Over 1650 cm (100 in. ).
545.10 Receptacle or Switch with Integral Enclosure.
545.11 Bonding and Grounding.
545.12 Grounding Electrode Conductor.
545.13 Component Interconnections.
Part II. Relocatable Structures 545.20 Application Provisions.
545.22 Power Supply. 545.22(A) Feeder.
545.22(B) Number of Supplies.
545.22(C) Identification.
545.22(D) Grounding. <\/td>\n<\/tr>\n
581<\/td>\n545.24 Disconnecting Means and Branch-Circuit Overcurrent Protection. 545.24(A) Disconnecting Means.
545.24(B) Branch-Circuit Protective Equipment and Panelboards.
545.26 Bonding of Exposed Non\u2013Current-Carrying Metal Parts.
545.27 Intersystem Bonding.
545.28 Ground-Fault Circuit-Interrupters (GFCI).
ARTICLE 547 Agricultural Buildings 547.1 Scope.
547.1(A) Excessive Dust and Dust with Water.
547.1(B) Corrosive Atmosphere.
547.2 Definitions.
Distribution Point.
Equipotential Plane (as applied to agricultural buildings).
Site-Isolating Device.
547.3 Other Articles.
547.4 Surface Temperatures. <\/td>\n<\/tr>\n
582<\/td>\n547.5 Wiring Methods. 547.5(A) Wiring Systems.
547.5(B) Mounting.
547.5(C) Equipment Enclosures, Boxes, Conduit Bodies, and Fittings. 547.5(C)(1) Excessive Dust.
547.5(C)(2) Damp or Wet Locations.
547.5(C)(3) Corrosive Atmosphere.
547.5(D) Flexible Connections.
547.5(E) Physical Protection.
547.5(F) Separate Equipment Grounding Conductor.
547.5(G) Receptacles.
547.6 Switches, Receptacles, Circuit Breakers, Controllers, and Fuses.
547.7 Motors.
547.8 Luminaires.
547.8(A) Minimize the Entrance of Dust.
547.8(B) Exposed to Physical Damage.
547.8(C) Exposed to Water. <\/td>\n<\/tr>\n
583<\/td>\n547.9 Electrical Supply to Building(s) or Structure(s) from a Distribution Point.
547.9(A) Site-Isolating Device.
547.9(A)(1) Where Required.
547.9(A)(2) Location.
547.9(A)(3) Operation.
547.9(A)(4) Bonding Provisions.
547.9(A)(5) Grounding.
547.9(A)(6) Rating.
547.9(A)(7) Overcurrent Protection.
547.9(A)(8) Accessibility.
547.9(A)(9) Series Devices.
547.9(A)(10) Marking.
547.9(B) Service Disconnecting Means and Overcurrent Protection at the Building(s) or Structure(s).
547.9(B)(1) Conductor Sizing.
547.9(B)(2) Conductor Installation.
547.9(B)(3) Grounding and Bonding.
547.9(C) Service Disconnecting Means and Overcurrent Protection at the Distribution Point.
547.9(D) Identification.
547.10 Equipotential Planes and Bonding of Equipotential Planes. <\/td>\n<\/tr>\n
584<\/td>\n547.10(A) Where Required.
547.10(A)(1) Indoors.
547.10(A)(2) Outdoors.
547.10(B) Bonding.
ARTICLE 550 Mobile Homes, Manufactured Homes, and Mobile Home Parks Part I. General 550.1 Scope.
550.2 Definitions. Appliance, Fixed.
Appliance, Portable.
Feeder Assembly.
Manufactured Home. <\/td>\n<\/tr>\n
585<\/td>\nMobile Home.
Mobile Home Accessory Building or Structure.
Mobile Home Lot.
Mobile Home Park.
Mobile Home Service Equipment.
Park Electrical Wiring Systems.
550.4 General Requirements. 550.4(A) In Other Than Mobile Home Parks.
550.4(B) Connection to Wiring System.
550.4(C) Listed and Labeled.
Part II. Mobile and Manufactured Homes 550.10 Power Supply. 550.10(A) Feeder.
550.10(B) Power-Supply Cord. <\/td>\n<\/tr>\n
586<\/td>\n550.10(C) Attachment Plug Cap.
Figure 550.10(C) 50-Ampere, 125\/250-Volt Receptacle and Attachment Plug Cap Configurations, 3-Pole, 4-Wire, Grounding-Types, Use
550.10(E) Marking.
550.10(F) Point of Entrance.
550.10(G) Protected.
550.10(H) Protection Against Corrosion and Mechanical Damage.
550.10(I) Mast Weatherhead or Raceway.
550.11 Disconnecting Means and Branch-Circuit Protective Equipment.
550.11(A) Disconnecting Means. <\/td>\n<\/tr>\n
587<\/td>\n550.11(B) Branch-Circuit Protective Equipment.
550.11(C) Two-Pole Circuit Breakers.
550.11(D) Electrical Nameplates.
550.12 Branch Circuits.
550.12(A) Lighting.
550.12(B) Small Appliances.
550.12(C) Laundry Area.
550.12(D) General Appliances.
550.12(E) Bathrooms.
550.13 Receptacle Outlets. <\/td>\n<\/tr>\n
588<\/td>\n550.13(A) Grounding-Type Receptacle Outlets.
550.13(B) Ground-Fault Circuit Interrupters (GFCI).
550.13(C) Cord-Connected Fixed Appliance.
550.13(D) Receptacle Outlets Required.
550.13(E) Pipe Heating Cable(s) Outlet.
550.13(F) Receptacle Outlets Not Permitted.
550.13(G) Receptacle Outlets Not Required.
550.14 Luminaires and Appliances. 550.14(A) Fasten Appliances in Transit.
550.14(B) Accessibility. <\/td>\n<\/tr>\n
589<\/td>\n550.14(C) Pendants.
550.14(D) Bathtub and Shower Luminaires.
550.15 Wiring Methods and Materials.
550.15(A) Nonmetallic Boxes.
550.15(B) Nonmetallic Cable Protection.
550.15(C) Metal-Covered and Nonmetallic Cable Protection.
550.15(D) Metal Faceplates.
550.15(E) Installation Requirements.
550.15(F) Raceways.
550.15(G) Switches.
550.15(H) Under-Chassis Wiring (Exposed to Weather). 550.15(H)(1)
550.15(H)(2)
550.15(I) Boxes, Fittings, and Cabinets.
550.15(J) Appliance Terminal Connections.
550.15(K) Component Interconnections. <\/td>\n<\/tr>\n
590<\/td>\n550.16 Grounding.
550.16(A) Grounded Conductor. 550.16(A)(1) Insulated.
550.16(A)(2) Connections of Ranges and Clothes Dryers.
550.16(B) Equipment Grounding Means. 550.16(B)(1) Supply Cord or Permanent Feeder.
550.16(B)(2) Electrical System.
550.16(B)(3) Cord-Connected Appliances.
550.16(C) Bonding of Non\u2013Current-Carrying Metal Parts. 550.16(C)(1) Exposed Non\u2013Current-Carrying Metal Parts.
550.16(C)(2) Grounding Terminals.
550.16(C)(3) Metallic Piping and Ducts.
550.16(C)(4) Metallic Roof and Exterior Coverings.
550.17 Testing. 550.17(A) Dielectric Strength Test.
550.17(B) Continuity and Operational Tests and Polarity Checks.
550.18 Calculations. <\/td>\n<\/tr>\n
591<\/td>\n550.18(A) Lighting, Small-Appliance, and Laundry Load. 550.18(A)(1) Lighting Volt-Amperes.
550.18(A)(2) Small-Appliance Volt-Amperes.
550.18(A)(3) Laundry Area Circuit Volt-Amperes.
550.18(A)(4) Total Volt-Amperes.
550.18(A)(5) Net Volt-Amperes.
550.18(B) Total Load for Determining Power Supply.
550.18(C) Optional Method of Calculation for Lighting and Appliance Load.
550.19 Interconnection of Multiple-Section Mobile or Manufactured Home Units. 550.19(A) Wiring Methods.
550.19(B) Disconnecting Means.
550.20 Outdoor Outlets, Luminaires, Air-Cooling Equipment, and So Forth. 550.20(A) Listed for Outdoor Use. <\/td>\n<\/tr>\n
592<\/td>\n550.20(B) Outside Heating Equipment, Air-Conditioning Equipment, or Both.
550.25 Arc-Fault Circuit-Interrupter Protection. 550.25(A) Definition.
550.25(B) Mobile Homes and Manufactured Homes.
Part III. Services and Feeders 550.30 Distribution System.
550.31 Allowable Demand Factors.
550.32 Service Equipment. <\/td>\n<\/tr>\n
593<\/td>\n550.32(A) Mobile Home Service Equipment.
550.32(B) Manufactured Home Service Equipment.
550.32(C) Rating.
550.32(D) Additional Outside Electrical Equipment.
550.32(E) Additional Receptacles.
550.32(F) Mounting Height.
550.32(G) Marking.
550.33 Feeder. 550.33(A) Feeder Conductors.
550.33(B) Feeder Capacity. <\/td>\n<\/tr>\n
594<\/td>\nARTICLE 551 Recreational Vehicles and Recreational Vehicle Parks Part I. General 551.1 Scope.
551.2 Definitions.
Air-Conditioning or Comfort-Cooling Equipment.
Appliance, Fixed.
Camping Trailer.
Converter.
Dead Front (as applied to switches, circuit breakers, switchboards, and panelboards).
Disconnecting Means.
Frame.
Low Voltage.
Motor Home.
Power-Supply Assembly. <\/td>\n<\/tr>\n
595<\/td>\nRecreational Vehicle.
Recreational Vehicle Park.
Recreational Vehicle Site.
Recreational Vehicle Site Feeder Circuit Conductors.
Recreational Vehicle Site Supply Equipment.
Recreational Vehicle Stand.
Travel Trailer.
Truck Camper.
551.4 General Requirements. 551.4(A) Not Covered.
551.4(B) Systems.
551.4(C) Labels.
Part II. Combination Electrical Systems <\/td>\n<\/tr>\n
596<\/td>\n551.20 Combination Electrical Systems. 551.20(A) General.
551.20(B) Voltage Converters (120-Volt Alternating Current to Low-Voltage Direct Current).
551.20(C) Bonding Voltage Converter Enclosures.
551.20(D) Dual-Voltage Fixtures, Including Luminaires or Appliances.
551.20(E) Autotransformers.
551.20(F) Receptacles and Plug Caps.
Part III. Other Power Sources 551.30 Generator Installations. 551.30(A) Mounting.
551.30(B) Generator Protection.
551.30(C) Installation of Storage Batteries and Generators.
551.30(D) Ventilation of Generator Compartments.
551.30(E) Supply Conductors. <\/td>\n<\/tr>\n
597<\/td>\n551.31 Multiple Supply Source. 551.31(A) Multiple Supply Sources.
551.31(B) Multiple Supply Sources Capacity.
551.31(C) Alternate Power Sources Exceeding 30 Amperes.
551.31(D) Power-Supply Assembly Not Less Than 30 Amperes.
551.32 Other Sources.
551.33 Alternate Source Restrictions.
Part IV. Nominal 120-Volt or 120\/240-Volt Systems 551.40 120-Volt or 120\/240-Volt, Nominal, Systems. 551.40(A) General Requireme
551.40(B) Materials and Equipment.
551.40(C) Ground-Fault Circuit-Interrupter Protection.
551.40(D) Reverse Polarity Device.
551.41 Receptacle Outlets Required. 551.41(A) Spacing.
551.41(B) Location. <\/td>\n<\/tr>\n
598<\/td>\n551.41(C) Ground-Fault Circuit-Interrupter Protection.
551.41(D) Face-Up Position.
551.42 Branch Circuits Required.
551.42(A) One 15-Ampere Circuit.
551.42(B) One 20-Ampere Circuit.
551.42(C) Two to Five 15or 20-Ampere Circuits.
551.42(D) More Than Five Circuits Without a Listed Energy Management System.
551.43 Branch-Circuit Protection. 551.43(A) Rating.
551.43(B) Protection for Smaller Conductors.
551.43(C) Fifteen-Ampere Receptacles Considered Protected by 20 Amperes.
551.44 Power-Supply Assembly.
551.44(A) Fifteen-Ampere Main Power-Supply Assembly. <\/td>\n<\/tr>\n
599<\/td>\n551.44(B) Twenty-Ampere Main Power-Supply Assembly.
551.44(C) Thirty-Ampere Main Power-Supply Assembly.
551.44(D) Fifty-Ampere Power-Supply Assembly.
551.45 Panelboard. 551.45(A) Listed and Appropriately Rated.
551.45(B) Location.
551.45(C) Dead-Front Type.
551.46 Means for Connecting to Power Supply. 551.46(A) Assembly.
551.46(A)(1) Separable.
551.46(A)(2) Permanently Connected.
551.46(B) Cord.
551.46(C) Attachment Plugs. 551.46(C)(1) Units with One 15-Ampere Branch Circuit.
Figure 551.46(C)(1) Configurations for Grounding-Type Receptacles and Attachment Plug Caps Used for Recreational Vehicle Supply <\/td>\n<\/tr>\n
600<\/td>\n551.46(C)(2) Units with One 20-Ampere Branch Circuit.
551.46(C)(3) Units with Two to Five 15or 20-Ampere Branch Circuits.
551.46(C)(4) Units with 50-Ampere Power-Supply Assembly.
551.46(D) Labeling at Electrical Entrance. <\/td>\n<\/tr>\n
601<\/td>\n551.46(E) Location.
551.47 Wiring Methods. 551.47(A) Wiring Systems.
551.47(B) Conduit and Tubing.
551.47(C) Nonmetallic Boxes.
551.47(D) Boxes.
551.47(E) Mounting.
551.47(F) Raceway and Cable Continuity.
551.47(G) Protected.
551.47(H) Bends.
551.47(I) Cable Supports.
551.47(J) Nonmetallic Box Without Cable Clamps.
551.47(K) Physical Damage.
551.47(L) Receptacle Faceplates.
551.47(M) Metal Faceplates Grounded.
551.47(N) Moisture or Physical Damage. <\/td>\n<\/tr>\n
602<\/td>\n551.47(O) Component Interconnections.
551.47(P) Method of Connecting Expandable Units.
551.47(P)(1) Cord-and-Plug-Connected.
551.47(P)(2) Direct Wired.
551.47(Q) Prewiring for Air-Conditioning Installation.
551.47(R) Prewiring for Generator Installation. <\/td>\n<\/tr>\n
603<\/td>\n551.47(S) Prewiring for Other Circuits.
551.48 Conductors and Boxes.
551.49 Grounded Conductors.
551.50 Connection of Terminals and Splices.
551.51 Switches. 551.51(A) Rating.
551.51(A)(1) Lighting Circuits.
551.51(A)(2) Motors or Other Loads.
551.51(B) Location.
551.52 Receptacles.
551.53 Luminaires and Other Equipment. 551.53(A) General.
551.53(B) Shower Luminaires.
551.53(C) Outdoor Outlets, Luminaires, Air-Cooling Equipment, and So On.
551.54 Grounding.
551.54(A) Power-Supply Grounding.
551.54(B) Panelboard. <\/td>\n<\/tr>\n
604<\/td>\n551.54(C) Insulated Grounded Conductor (Neutral Conductor).
551.55 Interior Equipment Grounding. 551.55(A) Exposed Metal Parts.
551.55(B) Equipment Grounding and Bonding Conductors.
551.55(C) Grounding of Electrical Equipment.
551.55(D) Grounding Connection in Nonmetallic Box.
551.55(E) Grounding Continuity.
551.55(F) Cord-Connected Appliances.
551.56 Bonding of Non\u2013Current-Carrying Metal Parts. 551.56(A) Required Bonding.
551.56(B) Bonding Chassis.
551.56(C) Bonding Conductor Requirements.
551.56(D) Metallic Roof and Exterior Bonding.
551.56(E) Gas, Water, and Waste Pipe Bonding.
551.56(F) Furnace and Metal Air Duct Bonding.
551.57 Appliance Accessibility and Fastening.
Part V. Factory Tests 551.60 Factory Tests (Electrical). <\/td>\n<\/tr>\n
605<\/td>\nPart VI. Recreational Vehicle Parks 551.71 Type Receptacles Provided. 551.71(A) 20-Ampere.
551.71(B) 30-Ampere.
551.71(C) 50-Ampere.
551.71(D) Tent Sites.
551.71(E) Additional Receptacles.
551.71(F) GFCI Protection.
551.72 Distribution System. 551.72(A) Systems.
551.72(B) Three-Phase Systems.
551.72(C) Receptacles.
551.72(D) Neutral Conductors.
551.72(E) Connected Devices.
551.72(F) Connection to Recreational Vehicle Site Equipment. <\/td>\n<\/tr>\n
606<\/td>\n551.73 Calculated Load. 551.73(A) Basis of Calculations.
551.73(B) Demand Factors.
551.74 Overcurrent Protection.
551.76 Grounding \u2014 Recreational Vehicle Site Supply Equipment. 551.76(A) Grounding Electrode.
551.76(B) Exposed Non\u2013Current-Carrying Metal Parts.
551.76(C) Secondary Distribution System. <\/td>\n<\/tr>\n
607<\/td>\n551.76(D) Grounded Conductor Not to Be Used as an Equipment Ground.
551.76(E) No Connection on the Load Side.
551.77 Recreational Vehicle Site Supply Equipment. 551.77(A) Location.
551.77(B) Disconnecting Means.
551.77(C) Access.
551.77(D) Mounting Height.
551.77(E) Working Space.
551.77(F) Marking.
551.78 Protection of Outdoor Equipment. 551.78(A) Wet Locations.
551.78(B) Meters.
551.79 Clearance for Overhead Conductors.
551.80 Underground Service, Feeder, Branch-Circuit, and Recreational Vehicle Site Feeder-Circuit Conductors. 551.80(A) General.
551.80(B) Protection Against Physical Damage.
551.81 Receptacles. <\/td>\n<\/tr>\n
608<\/td>\nARTICLE 552 Park Trailers Part I. General 552.1 Scope.
552.2 Definition.
Park Trailer.
552.4 General Requirements.
552.5 Labels.
Part II. Low-Voltage Systems 552.10 Low-Voltage Systems. 552.10(A) Low-Voltage Circuits.
552.10(B) Low-Voltage Wiring. 552.10(B)(1) Material.
552.10(B)(2) Conductor Types.
552.10(B)(3) Marking.
552.10(C) Low-Voltage Wiring Methods. 552.10(C)(1) Physical Protection.
552.10(C)(2) Splices.
552.10(C)(3) Separation. <\/td>\n<\/tr>\n
609<\/td>\n552.10(C)(4) Ground Connections.
552.10(D) Battery Installations.
552.10(E) Overcurrent Protection. 552.10(E)(1) Rating.
552.10(E)(2) Type.
552.10(E)(3) Appliances.
552.10(E)(4) Location.
552.10(F) Switches.
552.10(G) Luminaires.
Part III. Combination Electrical Systems 552.20 Combination Electrical Systems. 552.20(A) General.
552.20(B) Voltage Converters (120-Volt Alternating Current to Low-Voltage Direct Current). <\/td>\n<\/tr>\n
610<\/td>\n552.20(C) Bonding Voltage Converter Enclosures.
552.20(D) Dual-Voltage Fixtures Including Luminaires or Appliances.
552.20(E) Autotransformers.
552.20(F) Receptacles and Plug Caps.
Part IV. Nominal 120-Volt or 120\/240-Volt Systems 552.40 120-Volt or 120\/240-Volt, Nominal, Systems. 552.40(A) General Requireme
552.40(B) Materials and Equipment.
552.41 Receptacle Outlets Required. 552.41(A) Spacing.
552.41(B) Location.
552.41(C) Ground-Fault Circuit-Interrupter Protection.
552.41(D) Pipe Heating Cable Outlet. <\/td>\n<\/tr>\n
611<\/td>\n552.41(E) Outdoor Receptacle Outlets.
552.41(F) Receptacle Outlets Not Permitted. 552.41(F)(1) Shower or Bathtub Space.
552.41(F)(2) Face-Up Position.
552.42 Branch-Circuit Protection. 552.42(A) Rating.
552.42(B) Protection for Smaller Conductors.
552.42(C) Fifteen-Ampere Receptacle Considered Protected by 20 Amperes.
552.43 Power Supply. 552.43(A) Feeder.
552.43(B) Power-Supply Cord.
552.43(C) Mast Weatherhead or Raceway.
552.44 Cord. 552.44(A) Permanently Connected.
552.44(B) Cord Length. <\/td>\n<\/tr>\n
612<\/td>\n552.44(C) Attachment Plugs. 552.44(C)(1) Units with Two to Five 15or 20-Ampere Branch Circuits.
552.44(C)(2) Units with 50-Ampere Power Supply Assembly.
Figure 552.44(C)(1) Attachment Cap and Receptacle Configurations. 552.44(D) Labeling at Electrical Entrance.
552.44(E) Location.
552.45 Panelboard. 552.45(A) Listed and Appropriately Rated.
552.45(B) Location.
552.45(C) Dead-Front Type. <\/td>\n<\/tr>\n
613<\/td>\n552.46 Branch Circuits.
552.46(A) Two to Five 15or 20-Ampere Circuits.
552.46(B) More Than Five Circuits.
552.46(B)(1) Lighting.
552.46(B)(2) Small Appliances.
552.46(B)(3) General Appliances.
552.47 Calculations.
552.47(A) Lighting and Small-Appliance Load.
552.47(B) Total Load for Determining Power Supply. <\/td>\n<\/tr>\n
614<\/td>\n552.47(C) Optional Method of Calculation for Lighting and Appliance Load.
552.48 Wiring Methods. 552.48(A) Wiring Systems.
552.48(B) Conduit and Tubing.
552.48(C) Nonmetallic Boxes.
552.48(D) Boxes.
552.48(E) Mounting.
552.48(F) Cable Sheath.
552.48(G) Protected.
552.48(H) Cable Supports.
552.48(I) Nonmetallic Box Without Cable Clamps.
552.48(J) Physical Damage. <\/td>\n<\/tr>\n
615<\/td>\n552.48(K) Receptacle Faceplates.
552.48(L) Metal Faceplates Grounded.
552.48(M) Moisture or Physical Damage.
552.48(N) Component Interconnections.
552.48(O) Method of Connecting Expandable Units.
552.48(O)(1) Cord-and-Plug Connected.
552.48(O)(2) Direct Wires Connected.
552.48(P) Prewiring for Air-Conditioning Installation.
552.48(Q) Prewiring for Other Circuits. <\/td>\n<\/tr>\n
616<\/td>\n552.49 Maximum Number of Conductors in Boxes.
552.50 Grounded Conductors.
552.51 Connection of Terminals and Splices.
552.52 Switches.
552.52(A) Lighting Circuits.
552.52(B) Motors or Other Loads.
552.52(C) Location.
552.53 Receptacles.
552.54 Luminaires. 552.54(A) General.
552.54(B) Shower Luminaires.
552.54(C) Outdoor Outlets, Luminaires, Air-Cooling Equipment, and So On.
552.55 Grounding.
552.55(A) Power-Supply Grounding.
552.55(B) Panelboard.
552.55(C) Insulated Grounded Conductor.
552.56 Interior Equipment Grounding. 552.56(A) Exposed Metal Parts.
552.56(B) Equipment Grounding Conductors.
552.56(C) Grounding of Electrical Equipment. <\/td>\n<\/tr>\n
617<\/td>\n552.56(D) Grounding Connection in Nonmetallic Box.
552.56(E) Grounding Continuity.
552.56(F) Cord-Connected Appliances.
552.57 Bonding of Non\u2013Current-Carrying Metal Parts. 552.57(A) Required Bonding.
552.57(B) Bonding Chassis.
552.57(C) Bonding Conductor Requirements.
552.57(D) Metallic Roof and Exterior Bonding.
552.57(E) Gas, Water, and Waste Pipe Bonding.
552.57(F) Furnace and Metal Air Duct Bonding.
552.58 Appliance Accessibility and Fastening.
552.59 Outdoor Outlets, Fixtures, Including Luminaires, Air-Cooling Equipment, and So On. 552.59(A) Listed for Outdoor Use.
552.59(B) Outside Heating Equipment, Air-Conditioning Equipment, or Both.
Part V. Factory Tests 552.60 Factory Tests (Electrical). <\/td>\n<\/tr>\n
618<\/td>\n552.60(A) Circuits of 120 Volts or 120\/240 Volts.
552.60(B) Low-Voltage Circuits.
ARTICLE 555 Marinas, Boatyards, Floating Buildings, and Commercial and Noncommercial Docking Facilities Part I. General 555.1 Sc
555.2 Definitions.
Berth.
Boatyard.
Bulkhead.
Crane.
Docking Facility.
Floating Building.
Marina.
Marina Power Outlet.
Monorail. <\/td>\n<\/tr>\n
619<\/td>\nMooring(s).
Shore Power.
Slip.
Storage, Dry Stack.
Wharf.
555.3 Electrical Datum Plane Distances. 555.3(A) Floating Piers.
555.3(B) Areas Subject to Tidal Fluctuations.
555.3(C) Areas Not Subject to Tidal Fluctuations.
555.4 Location of Service Equipment.
555.5 Maximum Voltage.
555.6 Load Calculations for Service and Feeder Conductors. <\/td>\n<\/tr>\n
620<\/td>\n555.7 Transformers. 555.7(A) General.
555.7(B) Replacements.
555.8 Marine Hoists, Railways, Cranes, and Monorails.
555.9 Boat Hoists.
555.10 Signage.
555.11 Motor Fuel Dispensing Stations \u2014 Hazardous (Classified) Locations.
555.12 Repair Facilities \u2014 Hazardous (Classified) Locations.
555.13 Bonding of Non-Current-Carrying Metal Parts.
Part II. Marinas, Boatyards, and Docking Facilities 555.30 Electrical Connections. 555.30(A) Floating Piers.
555.30(B) Fixed Piers.
555.30(C) Replacements.
555.31 Electrical Equipment Enclosures. 555.31(A) Securing and Supporting.
555.31(B) Location.
555.32 Circuit Breakers, Switches, Panelboards, and Marina Power Outlets.
555.33 Receptacles.
555.33(A) Shore Power Receptacles. <\/td>\n<\/tr>\n
621<\/td>\n555.33(A)(1) Enclosures.
555.33(A)(2) Strain Relief.
555.33(A)(3) Branch Circuits.
555.33(A)(4) Ratings.
555.33(B) Other Than Shore Power. 555.33(B)(1) Ground-Fault Circuit-Interrupter (GFCI) Protection for Personnel.
555.33(B)(2) Marking.
555.33(C) Replacement Receptacles.
555.34 Wiring Methods and Installation. 555.34(A) Wiring Methods. 555.34(A)(1) General.
555.34(A)(2) Portable Power Cables.
555.34(A)(3) Temporary Wiring.
555.34(B) Installation. 555.34(B)(1) Overhead Wiring.
555.34(B)(2) Outdoor Branch Circuits and Feeders.
555.34(B)(3) Portable Power Cables. <\/td>\n<\/tr>\n
622<\/td>\n555.34(B)(4) Protection.
555.35 Ground-Fault Protection of Equipment (GFPE) and Ground-Fault Circuit-Interrupter (GFCI) Protection. 555.35(A) Ground-Faul
555.35(A)(1) Receptacles Providing Shore Power.
555.35(A)(2) GFCI Protection for Personnel.
555.35(A)(3) Feeder and Branch-Circuit Conductors with GFPE.
555.35(B) Leakage Current Measurement Device.
555.36 Disconnecting Means for Shore Power Connection(s).
555.36(A) Type.
555.36(B) Location.
555.37 Equipment Grounding Conductor. 555.37(A) Equipment to Be Connected to Equipment Grounding Conductor.
555.37(B) Type of Equipment Grounding Conductor.
555.37(C) Size of Equipment Grounding Conductor.
555.37(D) Branch-Circuit Equipment Grounding Conductor. <\/td>\n<\/tr>\n
623<\/td>\n555.37(E) Feeder Equipment Grounding Conductor.
Part III. Floating Buildings 555.50 Service Conductors.
555.51 Feeder Conductors.
555.52 Installation of Services and Feeders. 555.52(A) Flexibility.
555.52(B) Wiring Methods.
555.53 Ground-Fault Protection.
555.54 Grounding.
555.54(A) Grounding of Electrical and Nonelectrical Parts.
555.54(B) Installation and Connection of Equipment Grounding Conductor.
555.54(C) Identification of Equipment Grounding Conductor.
555.54(D) Grounding Electrode Conductor Connection.
555.55 Insulated Neutral.
555.56 Equipment Grounding. 555.56(A) Electrical Systems.
555.56(B) Cord-Connected Appliances.
ARTICLE 590 Temporary Installations 590.1 Scope.
590.2 All Wiring Installations. 590.2(A) Other Articles.
590.2(B) Approval. <\/td>\n<\/tr>\n
624<\/td>\n590.3 Time Constraints. 590.3(A) During the Period of Construction.
590.3(B) 90 Days.
590.3(C) Emergencies and Tests.
590.3(D) Removal.
590.4 General. 590.4(A) Services.
590.4(B) Feeders.
590.4(C) Branch Circuits.
590.4(D) Receptacles. 590.4(D)(1) All Receptacles.
590.4(D)(2) Receptacles in Wet Locations.
590.4(E) Disconnecting Means.
590.4(F) Lamp Protection.
590.4(G) Splices. <\/td>\n<\/tr>\n
625<\/td>\n590.4(H) Protection from Accidental Damage.
590.4(I) Termination(s) at Devices.
590.4(J) Support.
590.5 Listing of Decorative Lighting.
590.6 Ground-Fault Protection for Personnel.
590.6(A) Receptacle Outlets.
590.6(A)(1) Receptacle Outlets Not Part of Permanent Wiring.
590.6(A)(2) Receptacle Outlets Existing or Installed as Permanent Wiring.
590.6(A)(3) Receptacles on 15-kW or less Portable Generators.
590.6(B) Other Receptacle Outlets.
590.6(B)(1) GFCI Protection.
590.6(B)(2) Assured Equipment Grounding Conductor Program. <\/td>\n<\/tr>\n
626<\/td>\n590.7 Guarding.
590.8 Overcurrent Protective Devices. 590.8(A) Where Reused.
590.8(B) Service Overcurrent Protective Devices.
Chapter 6 Special Equipment
ARTICLE 600 Electric Signs and Outline Lighting Part I. General 600.1 Scope.
600.2 Definitions.
Host Sign.
LED Sign Illumination System.
Neon Tubing.
Photovoltaic (PV) Powered Sign.
Retrofit Kit, General Use.
Retrofit Kit, Sign Specific.
Section Sign.
Sign Body. <\/td>\n<\/tr>\n
627<\/td>\nSkeleton Tubing.
Subassembly.
600.3 Listing.
600.3(A) Field-Installed Skeleton Tubing.
600.3(B) Outline Lighting.
600.4 Markings. 600.4(A) Signs and Outline Lighting Systems.
600.4(B) Signs with a Retrofitted Illumination System.
600.4(C) Signs with Lampholders for Incandescent Lamps.
600.4(D) Visibility.
600.4(E) Durability.
600.4(F) Installation Instructions.
600.5 Branch Circuits. 600.5(A) Required Branch Circuit.
600.5(B) Marking.
600.5(C) Rating.
600.5(C)(1) Neon Signs.
600.5(C)(2) All Other Signs.
600.5(D) Wiring Methods. <\/td>\n<\/tr>\n
628<\/td>\n600.5(D)(1) Supply.
600.5(D)(2) Enclosures as Pull Boxes.
600.5(D)(3) Metal or Nonmetallic Poles.
600.6 Disconnects.
600.6(A) Location.
600.6(A)(1) At Point of Entry to a Sign.
600.6(A)(2) Within Sight of the Sign.
600.6(A)(3) Within Sight of the Controller.
600.6(A)(4) Remote Location.
600.6(B) Control Switch Rating.
600.7 Grounding and Bonding. 600.7(A) Grounding. 600.7(A)(1) Equipment Grounding.
600.7(A)(2) Size of Equipment Grounding Conductor. <\/td>\n<\/tr>\n
629<\/td>\n600.7(A)(3) Connections.
600.7(A)(4) Auxiliary Grounding Electrode.
600.7(A)(5) Metal Building Parts.
600.7(B) Bonding. 600.7(B)(1) Bonding of Metal Parts.
600.7(B)(2) Bonding Connections.
600.7(B)(3) Metal Building Parts.
600.7(B)(4) Flexible Metal Conduit Length.
600.7(B)(5) Small Metal Parts.
600.7(B)(6) Nonmetallic Conduit.
600.7(B)(7) Bonding Conductors.
600.7(B)(8) Signs in Fountains.
600.8 Enclosures.
600.8(A) Strength.
600.8(B) Material.
600.8(C) Minimum Thickness of Enclosure Metal.
600.8(D) Protection of Metal.
600.9 Location. 600.9(A) Vehicles. <\/td>\n<\/tr>\n
630<\/td>\n600.9(B) Pedestrians.
600.9(C) Adjacent to Combustible Materials.
600.9(D) Wet Location.
600.10 Portable or Mobile Signs. 600.10(A) Support.
600.10(B) Attachment Plug.
600.10(C) Wet or Damp Location.
600.10(C)(1) Cords.
600.10(C)(2) Ground-Fault Circuit Interrupter.
600.10(D) Dry Location.
600.12 Field-Installed Secondary Wiring.
600.12(A) 1000 Volts or Less.
600.12(B) Over 1000 Volts.
600.12(C) Class 2.
600.21 Ballasts, Transformers, Electronic Power Supplies, and Class 2 Power Sources.
600.21(A) Accessibility.
600.21(B) Location.
600.21(C) Wet Location. <\/td>\n<\/tr>\n
631<\/td>\n600.21(D) Working Space.
600.21(E) Attic and Soffit Locations.
600.21(F) Suspended Ceilings.
600.22 Ballasts. 600.22(A) Type.
600.22(B) Thermal Protection.
600.23 Transformers and Electronic Power Supplies. 600.23(A) Type.
600.23(B) Secondary-Circuit Ground-Fault Protection.
600.23(C) Voltage.
600.23(D) Rating.
600.23(E) Secondary Connections.
600.23(F) Marking.
600.24 Class 2 Power Sources.
600.24(A) Listing.
600.24(B) Grounding.
600.24(C) Wiring Methods on the Supply Side of the Class 2 Power Supply.
600.24(D) Secondary Wiring.
Part II. Field-Installed Skeleton Tubing, Outline Lighting, and Secondary Wiring 600.30 Applicability. <\/td>\n<\/tr>\n
632<\/td>\n600.31 Neon Secondary-Circuit Wiring, 1000 Volts or Less, Nominal. 600.31(A) Wiring Method.
600.31(B) Insulation and Size.
600.31(C) Number of Conductors in Raceway.
600.31(D) Installation.
600.31(E) Protection of Leads.
600.32 Neon Secondary-Circuit Wiring, over 1000 Volts, Nominal. 600.32(A) Wiring Methods. 600.32(A)(1) Installation.
600.32(A)(2) Number of Conductors.
600.32(A)(3) Size.
600.32(A)(4) Spacing from Grounded Parts.
600.32(A)(5) Metal Building Parts.
600.32(B) Insulation and Size.
600.32(C) Installation.
600.32(D) Bends in Conductors.
600.32(E) Spacing.
600.32(F) Insulators and Bushings.
600.32(G) Conductors in Raceways.
600.32(H) Between Neon Tubing and Midpoint Return.
600.32(I) Dwelling Occupancies. <\/td>\n<\/tr>\n
633<\/td>\n600.32(J) Length of Secondary Circuit Conductors. 600.32(J)(1) Secondary Conductor to the First Electrode.
600.32(J)(2) Other Secondary Circuit Conductors.
600.32(K) Splices.
600.33 Class 2 Sign Illumination Systems, Secondary Wiring.
600.33(A) Insulation and Sizing of Class 2 Conductors.
600.33(A)(1) General Use.
600.33(A)(2) Other Building Locations. <\/td>\n<\/tr>\n
634<\/td>\n600.33(A)(3) Wet Locations.
600.33(A)(4) Other Locations.
600.33(B) Installation.
600.33(C) Protection Against Physical Damage.
600.33(D) Grounding and Bonding.
600.34 Photovoltaic (PV) Powered Sign.
600.34(A) Equipment.
600.34(B) Wiring.
600.34(C) Flexible Cords and Cables.
600.34(D) Grounding.
600.34(E) Disconnecting Means.
600.34(F) Battery Compartments.
600.35 Retrofit Kits. 600.35(A) General.
600.35(B) Installation.
600.35(B)(1) Wiring Methods. <\/td>\n<\/tr>\n
635<\/td>\nARTICLE 604 Manufactured Wiring Systems 604.1 Scope.
604.2 Definition.
600.35(B)(2) Damaged Parts.
600.35(B)(3) Workmanship.
600.35(B)(4) Marking.
600.41 Neon Tubing. 600.41(A) Design.
600.41(B) Support.
600.41(C) Spacing.
600.41(D) Protection.
600.42 Electrode Connections. 600.42(A) Points of Transition.
600.42(B) Accessibility.
600.42(C) Electrode Connections.
600.42(D) Support.
600.42(E) Receptacles.
600.42(F) Bushings.
600.42(G) Wet Locations.
600.42(H) Electrode Enclosures.
600.42(H)(1) Dry Locations.
600.42(H)(2) Damp and Wet Locations. <\/td>\n<\/tr>\n
636<\/td>\nManufactured Wiring System.
604.6 Listing Requirements.
604.7 Installation.
604.10 Uses Permitted.
604.12 Uses Not Permitted.
604.100 Construction. 604.100(A) Cable or Conduit Types. 604.100(A)(1) Cables.
604.100(A)(2) Conduits.
604.100(A)(3) Flexible Cord.
604.100(A)(4) Busways.
604.100(A)(5) Raceway.
604.100(B) Marking.
604.100(C) Receptacles and Connectors.
604.100(D) Other Component Parts.
ARTICLE 605 Office Furnishings <\/td>\n<\/tr>\n
637<\/td>\n605.1 Scope. 605.1(A) Covered.
605.1(B) Not Covered.
605.2 Definition.
Office Furnishing.
605.3 General.
605.3(A) Use.
605.3(B) Hazardous (Classified) Locations.
605.4 Wireways.
605.5 Office Furnishing Interconnections.
605.6 Lighting Accessories.
605.6(A) Support.
605.6(B) Connection.
605.6(C) Receptacle Outlet.
605.7 Fixed-Type Office Furnishings.
605.8 Freestanding-Type Office Furnishings.
605.9 Freestanding-Type Office Furnishings, Cordand Plug-Connected. <\/td>\n<\/tr>\n
638<\/td>\n605.9(A) Flexible Power-Supply Cord.
605.9(B) Receptacle Supplying Power.
605.9(C) Receptacle, Maximum.
605.9(D) Multiwire Circuits, Not Permitted.
ARTICLE 610 Cranes and Hoists Part I. General 610.1 Scope.
610.2 Definition.
Festoon Cable.
610.3 Special Requirements for Particular Locations. 610.3(A) Hazardous (Classified) Locations.
610.3(A)(1) Class I Locations.
610.3(A)(2) Class II Locations.
610.3(A)(3) Class III Locations.
610.3(B) Combustible Materials.
610.3(C) Electrolytic Cell Lines.
Part II. Wiring 610.11 Wiring Method.
610.11(A) Contact Conductor.
610.11(B) Exposed Conductors.
610.11(C) Flexible Connections to Motors and Similar Equipment. <\/td>\n<\/tr>\n
639<\/td>\n610.11(D) Pushbutton Station Multiconductor Cable.
610.11(E) Flexibility to Moving Parts.
610.12 Raceway or Cable Terminal Fittings.
610.12(A) Separately Bushed Hole.
610.12(B) Bushing in Lieu of a Box.
610.13 Types of Conductors.
610.13(A) Exposed to External Heat or Connected to Resistors.
610.13(B) Contact Conductors.
610.13(C) Flexibility.
610.13(D) Class 1, Class 2, and Class 3 Circuits.
610.14 Rating and Size of Conductors. 610.14(A) Ampacity.
1 2 1 <\/td>\n<\/tr>\n
640<\/td>\n610.14(B) Secondary Resistor Conductors. <\/td>\n<\/tr>\n
641<\/td>\n610.14(C) Minimum Size.
610.14(D) Contact Conductors.
610.14(E) Calculation of Motor Load. 610.14(E)(1) Single Motor.
610.14(E)(2) Multiple Motors on Single Crane or Hoist.
610.14(E)(3) Multiple Cranes or Hoists on a Common Conductor System. <\/td>\n<\/tr>\n
642<\/td>\n610.14(F) Other Loads.
610.14(G) Nameplate.
610.15 Common Return.
Part III. Contact Conductors 610.21 Installation of Contact Conductors.
610.21(A) Locating or Guarding Contact Conductors.
610.21(B) Contact Wires.
610.21(C) Supports Along Runways.
610.21(D) Supports on Bridges.
610.21(E) Supports for Rigid Conductors.
610.21(F) Track as Circuit Conductor.
610.21(G) Electrical Continuity of Contact Conductors.
610.21(H) Not to Supply Other Equipment.
610.22 Collectors.
Part IV. Disconnecting Means 610.31 Runway Conductor Disconnecting Means. <\/td>\n<\/tr>\n
643<\/td>\n610.32 Disconnecting Means for Cranes and Monorail Hoists.
610.33 Rating of Disconnecting Means.
Part V. Overcurrent Protection 610.41 Feeders, Runway Conductors. 610.41(A) Single Feeder.
610.41(B) More Than One Feeder Circuit.
610.42 Branch-Circuit Short-Circuit and Ground-Fault Protection.
610.42(A) Fuse or Circuit Breaker Rating.
610.42(B) Taps. 610.42(B)(1) Multiple Motors.
610.42(B)(2) Control Circuits.
610.43 Overload Protection. 610.43(A) Motor and Branch-Circuit Overload Protection.
610.43(B) Manually Controlled Motor.
610.43(C) Multimotor.
610.43(D) Hoists and Monorail Hoists. <\/td>\n<\/tr>\n
644<\/td>\nPart VI. Control 610.51 Separate Controllers.
610.51(A) Motions with More Than One Motor.
610.51(B) Multiple Motion Controller.
610.53 Overcurrent Protection.
610.53(A) Taps to Control Transformers.
610.53(B) Continuity of Power.
610.57 Clearance.
Part VII. Grounding and Bonding 610.61 Grounding and Bonding.
ARTICLE 620 Elevators, Dumbwaiters, Escalators, Moving Walks, Platform Lifts, and Stairway Chairlifts Part I. General 620.1 Scop
620.2 Definitions.
Informational Note Figure 620.2, No. 2 Control System. <\/td>\n<\/tr>\n
645<\/td>\nControl Room (for Elevator, Dumbwaiter).
Control Space (for Elevator, Dumbwaiter).
Control System.
Controller, Motion.
Controller, Motor.
Controller, Operation.
Machine Room (for Elevator, Dumbwaiter).
Machinery Space (for Elevator, Dumbwaiter, Platform Lift, and Stairway Chairlift). <\/td>\n<\/tr>\n
646<\/td>\nOperating Device.
Remote Machine Room and Control Room (for Elevator, Dumbwaiter).
Remote Machinery Space and Control Space (for Elevator, Dumbwaiter).
Signal Equipment.
620.3 Voltage Limitations.
620.3(A) Power Circuits.
620.3(B) Lighting Circuits.
620.3(C) Heating and Air-Conditioning Circuits.
620.4 Live Parts Enclosed.
620.5 Working Clearances.
620.5(A) Flexible Connections to Equipment.
620.5(B) Guards.
620.5(C) Examination, Adjusting, and Servicing.
620.5(D) Low Voltage.
620.6 Ground-Fault Circuit-Interrupter Protection for Personnel.
Part II. Conductors <\/td>\n<\/tr>\n
647<\/td>\n620.11 Insulation of Conductors.
620.11(A) Hoistway Door Interlock Wiring.
620.11(B) Traveling Cables.
620.11(C) Other Wiring.
620.11(D) Insulation.
620.12 Minimum Size of Conductors.
620.12(A) Traveling Cables. 620.12(A)(1) Lighting Circuits.
620.12(A)(2) Other Circuits.
620.12(B) Other Wiring.
620.13 Feeder and Branch-Circuit Conductors.
Informational Note Figure 620.13 Single-Line Diagram. <\/td>\n<\/tr>\n
648<\/td>\n620.13(A) Conductors Supplying Single Motor.
620.13(B) Conductors Supplying a Single Motor Controller.
620.13(C) Conductors Supplying a Single Power Transformer.
620.13(D) Conductors Supplying More Than One Motor, Motor Controller, or Power Transformer. <\/td>\n<\/tr>\n
649<\/td>\n620.14 Feeder Demand Factor.
620.15 Motor Controller Rating.
620.16 Short-Circuit Current Rating. 620.16(A) Marking.
620.16(B) Installation.
Part III. Wiring 620.21 Wiring Methods.
620.21(A) Elevators. 620.21(A)(1) Hoistways and Pits. <\/td>\n<\/tr>\n
650<\/td>\n620.21(A)(2) Cars.
620.21(A)(3) Within Machine Rooms, Control Rooms, and Machinery Spaces and Control Spaces.
620.21(A)(4) Counterweight.
620.21(B) Escalators. 620.21(B)(1) Wiring Methods. <\/td>\n<\/tr>\n
651<\/td>\n620.21(B)(2) Class 2 Circuit Cables.
620.21(B)(3) Flexible Cords.
620.21(C) Platform Lifts and Stairway Chairlift Raceways. 620.21(C)(1) Wiring Methods.
620.21(C)(2) Class 2 Circuit Cables.
620.21(C)(3) Flexible Cords and Cables.
620.22 Branch Circuits for Car Lighting, Receptacle(s), Ventilation, Heating, and Air-Conditioning. 620.22(A) Car Light Receptac
620.22(B) Air-Conditioning and Heating Source.
620.23 Branch Circuits for Machine Room or Control Room\/Machinery Space or Control Space Lighting and Receptacle(s). 620.23(A) S
620.23(B) Lighting Switch.
620.23(C) Duplex Receptacle.
620.24 Branch Circuit for Hoistway Pit Lighting and Receptacles. 620.24(A) Separate Branch Circuits.
620.24(B) Lighting Switch.
620.24(C) Duplex Receptacle. <\/td>\n<\/tr>\n
652<\/td>\n620.25 Branch Circuits for Other Utilization Equipment. 620.25(A) Additional Branch Circuits.
620.25(B) Overcurrent Devices.
Part IV. Installation of Conductors 620.32 Metal Wireways and Nonmetallic Wireways.
620.33 Number of Conductors in Raceways.
620.34 Supports.
620.35 Auxiliary Gutters.
620.36 Different Systems in One Raceway or Traveling Cable.
620.37 Wiring in Hoistways, Machine Rooms, Control Rooms, Machinery Spaces, and Control Spaces. 620.37(A) Uses Permitted.
620.37(B) Lightning Protection.
620.37(C) Main Feeders.
620.38 Electrical Equipment in Garages and Similar Occupancies.
Part V. Traveling Cables 620.41 Suspension of Traveling Cables. <\/td>\n<\/tr>\n
653<\/td>\n620.42 Hazardous (Classified) Locations.
620.43 Location of and Protection for Cables.
620.44 Installation of Traveling Cables.
Part VI. Disconnecting Means and Control 620.51 Disconnecting Means.
620.51(A) Type.
620.51(B) Operation.
620.51(C) Location.
620.51(C)(1) On Elevators Without Generator Field Control.
620.51(C)(2) On Elevators with Generator Field Control.
620.51(C)(3) On Escalators and Moving Walks.
620.51(C)(4) On Platform Lifts and Stairway Chairlifts.
620.51(D) Identification and Signs. <\/td>\n<\/tr>\n
654<\/td>\n620.51(D)(1) More than One Driving Machine.
620.51(D)(2) Available Fault Current Field Marking.
620.51(E) Surge Protection.
620.52 Power from More Than One Source. 620.52(A) Single-Car and Multicar Installations.
620.52(B) Warning Sign for Multiple Disconnecting Means.
620.52(C) Interconnection Multicar Controllers.
620.53 Car Light, Receptacle(s), and Ventilation Disconnecting Means.
620.54 Heating and Air-Conditioning Disconnecting Means.
620.55 Utilization Equipment Disconnecting Means.
Part VII. Overcurrent Protection 620.61 Overcurrent Protection.
620.61(A) Operating Devices and Control and Signaling Circuits. <\/td>\n<\/tr>\n
655<\/td>\n620.61(B) Overload Protection for Motors.
620.61(B)(1) Duty Rating on Elevator, Dumbwaiter, and Motor-Generator Sets Driving Motors.
620.61(B)(2) Duty Rating on Escalator Motors.
620.61(B)(3) Overload Protection.
620.61(B)(4) Duty Rating and Overload Protection on Platform Lift and Stairway Chairlift Motors.
620.61(C) Motor Feeder Short-Circuit and Ground-Fault Protection.
620.61(D) Motor Branch-Circuit Short-Circuit and Ground-Fault Protection.
620.62 Selective Coordination.
620.65 Signage.
Part VIII. Machine Rooms, Control Rooms, Machinery Spaces, and Control Spaces 620.71 Guarding Equipment.
620.71(A) Motor Controllers.
620.71(B) Driving Machines.
Part IX. Grounding and Bonding 620.81 Metal Raceways Attached to Cars.
620.82 Electric Elevators.
620.83 Nonelectric Elevators. <\/td>\n<\/tr>\n
656<\/td>\n620.84 Escalators, Moving Walks, Platform Lifts, and Stairway Chairlifts.
Part X. Emergency and Standby Power Systems 620.91 Emergency and Standby Power Systems.
620.91(A) Regenerative Power.
620.91(B) Other Building Loads.
620.91(C) Disconnecting Means.
ARTICLE 625 Electric Vehicle Power Transfer System Part I. General 625.1 Scope.
625.2 Definitions.
Cable Management System.
Charger Power Converter.
Electric Vehicle Connector.
Electric Vehicle Power Export Equipment (EVPE).
Electric Vehicle Supply Equipment (EVSE).
Fastened in Place. <\/td>\n<\/tr>\n
657<\/td>\nFixed in Place.
Output Cable to the Electric Vehicle.
Output Cable to the Primary Pad.
Personnel Protection System.
Portable (as applied to EVSE).
Power-Supply Cord.
Primary Pad.
Wireless Power Transfer (WPT).
Wireless Power Transfer Equipment (WPTE).
625.4 Voltages.
625.5 Listed.
Part II. Equipment Construction 625.17 Cords and Cables. 625.17(A) Power-Supply Cord.
625.17(B) Output Cable to Electric Vehicle.
625.17(C) Overall Cord and Cable Length. <\/td>\n<\/tr>\n
658<\/td>\n625.17(C)(1) Portable Equipment.
625.17(C)(2) Fastened in Place.
625.17(D) Interconnecting Cabling Systems.
625.22 Personnel Protection System.
Part III. Installation 625.40 Electric Vehicle Branch Circuit.
625.41 Overcurrent Protection.
625.42 Rating.
625.43 Disconnecting Means.
625.44 Equipment Connection.
625.44(A) Portable Equipment.
625.44(B) Fastened-in-Place Equipment.
625.44(C) Fixed Equipment.
625.46 Loss of Primary Source.
625.47 Multiple Feeder or Branch Circuits.
625.48 Interactive Systems. <\/td>\n<\/tr>\n
659<\/td>\n625.50 Location.
625.52 Ventilation.
625.52(A) Ventilation Not Required.
625.52(B) Ventilation Required.
625.52(B)(1) Table Values.
3 <\/td>\n<\/tr>\n
660<\/td>\n625.52(B)(2) Other Values.
625.52(B)(3) Engineered Systems.
625.52(B)(4) Supply Circuits.
625.54 Ground-Fault Circuit-Interrupter Protection for Personnel.
625.56 Receptacle Enclosures. <\/td>\n<\/tr>\n
661<\/td>\n625.60 AC Receptacle Outlets Used for EVPE.
625.60(A) Type.
625.60(B) Rating.
625.60(C) Overcurrent Protection.
625.60(D) GFCI Protection for Personnel.
Part IV. Wireless Power Transfer Equipment 625.101 Grounding.
625.102 Installation. 625.102(A) Type.
625.102(B) General.
625.102(C) Primary Pad.
625.102(D) Protection of Output Cable.
625.102(E) Other Wiring Systems.
ARTICLE 626 Electrified Truck Parking Spaces Part I. General 626.1 Scope.
626.2 Definitions. <\/td>\n<\/tr>\n
662<\/td>\nCable Management System (Electrified Truck Parking Spaces).
Cord Connector.
Disconnecting Means, Parking Space.
Electrified Truck Parking Space.
Electrified Truck Parking Space Wiring Systems.
Overhead Gantry.
Separable Power Supply Cable Assembly.
Transport Refrigerated Unit (TRU).
Truck.
Truck Coupler.
Truck Flanged Surface Inlet.
626.3 Other Articles.
626.3(A) Vehicle Repair and Storage Facilities.
626.3(B) Motor Fuel Dispensing Stations.
626.4 General Requirements. 626.4(A) Not Covered.
626.4(B) Distribution System Voltages. <\/td>\n<\/tr>\n
663<\/td>\n626.4(C) Connection to Wiring System.
Part II. Electrified Truck Parking Space Electrical Wiring Systems 626.10 Branch Circuits.
626.11 Feeder and Service Load Calculations. 626.11(A) Parking Space Load.
626.11(B) Demand Factors. <\/td>\n<\/tr>\n
664<\/td>\n626.11(C) Two or More Electrified Truck Parking Spaces.
626.11(D) Conductor Rating.
Part III. Electrified Truck Parking Space Supply Equipment 626.22 Wiring Methods and Materials. 626.22(A) Electrified Truck Park
626.22(B) Mounting Height.
626.22(C) Access to Working Space.
626.22(D) Disconnecting Means.
626.23 Overhead Gantry or Cable Management System. 626.23(A) Cable Management.
626.23(B) Strain Relief.
626.24 Electrified Truck Parking Space Supply Equipment Connection Means. 626.24(A) General.
626.24(B) Receptacle.
626.24(C) Disconnecting Means, Parking Space.
626.24(D) Ground-Fault Circuit-Interrupter Protection for Personnel.
626.25 Separable Power-Supply Cable Assembly.
626.25(A) Rating(s). <\/td>\n<\/tr>\n
665<\/td>\n626.25(A)(1) Twenty-Ampere Power-Supply Cable Assembly.
626.25(A)(2) Thirty-Ampere Power-Supply Cable Assembly.
626.25(B) Power-Supply Cord. 626.25(B)(1) Conductors.
626.25(B)(2) Cord.
626.25(B)(3) Cord Overall Length.
626.25(B)(4) Attachment Plug.
626.25(B)(5) Cord Connector.
626.26 Loss of Primary Power.
626.27 Interactive Systems.
Part IV. Transport Refrigerated Units (TRUs) 626.30 Transport Refrigerated Units.
626.30(A) Branch Circuits.
626.30(B) Electrified Truck Parking Space Supply Equipment. <\/td>\n<\/tr>\n
666<\/td>\n626.31 Disconnecting Means and Receptacles. 626.31(A) Disconnecting Means.
626.31(B) Location.
626.31(C) Receptacles.
626.32 Separable Power Supply Cable Assembly.
626.32(A) Rating(s).
626.32(B) Cord Assemblies.
626.32(C) Attachment Plug(s) and Cord Connector(s).
ARTICLE 630 Electric Welders Part I. General 630.1 Scope.
630.6 Listing.
Part II. Arc Welders 630.11 Ampacity of Supply Conductors. <\/td>\n<\/tr>\n
667<\/td>\n630.11(A) Individual Welders.
630.11(B) Group of Welders.
630.12 Overcurrent Protection.
630.12(A) For Welders.
630.12(B) For Conductors.
630.13 Disconnecting Means.
630.14 Marking. <\/td>\n<\/tr>\n
668<\/td>\n630.15 Grounding of Welder Secondary Circuit.
Part III. Resistance Welders 630.31 Ampacity of Supply Conductors.
630.31(A) Individual Welders.
630.31(B) Groups of Welders.
630.32 Overcurrent Protection. <\/td>\n<\/tr>\n
669<\/td>\n630.32(A) For Welders.
630.32(B) For Conductors.
630.33 Disconnecting Means.
630.34 Marking.
Part IV. Welding Cable 630.41 Conductors.
630.42 Installation.
630.42(A) Cable Support.
630.42(B) Spread of Fire and Products of Combustion.
630.42(C) Signs.
ARTICLE 640 Audio Signal Processing, Amplification, and Reproduction Equipment Part I. General 640.1 Scope. 640.1(A) Covered.
640.1(B) Not Covered.
640.2 Definitions.
Abandoned Audio Distribution Cable. <\/td>\n<\/tr>\n
670<\/td>\nAudio Amplifier or Pre-Amplifier.
Audio Autotransformer.
Audio Signal Processing Equipment.
Audio System.
Audio Transformer.
Equipment Rack.
Loudspeaker.
Maximum Output Power.
Mixer.
Portable Equipment.
Rated Output Power.
Technical Power System.
Temporary Equipment.
640.3 Locations and Other Articles.
640.3(A) Spread of Fire or Products of Combustion.
640.3(B) Ducts, Plenums, and Other Air-Handling Spaces. <\/td>\n<\/tr>\n
671<\/td>\n640.3(C) Cable Trays.
640.3(D) Hazardous (Classified) Locations.
640.3(E) Assembly Occupancies.
640.3(F) Theaters, Audience Areas of Motion Picture and Television Studios, and Similar Locations.
640.3(G) Carnivals, Circuses, Fairs, and Similar Events.
640.3(H) Motion Picture and Television Studios.
640.3(I) Swimming Pools, Fountains, and Similar Locations.
640.3(J) Combination Systems.
640.3(K) Antennas.
640.3(L) Generators.
640.3(M) Organ Pipes.
640.4 Protection of Electrical Equipment.
640.5 Access to Electrical Equipment Behind Panels Designed to Allow Access.
640.6 Mechanical Execution of Work. 640.6(A) Installation of Audio Distribution Cables.
640.6(B) Abandoned Audio Distribution Cables.
640.6(C) Installed Audio Distribution Cable Identified for Future Use. 640.6(C)(1)
640.6(C)(2) <\/td>\n<\/tr>\n
672<\/td>\n640.7 Grounding. 640.7(A) General.
640.7(B) Separately Derived Systems with 60 Volts to Ground.
640.7(C) Isolated Ground Receptacles.
640.8 Grouping of Conductors.
640.9 Wiring Methods. 640.9(A) Wiring to and Between Audio Equipment. 640.9(A)(1) Power Wiring.
640.9(A)(2) Separately Derived Power Systems.
640.9(A)(3) Other Wiring.
640.9(B) Auxiliary Power Supply Wiring.
640.9(C) Output Wiring and Listing of Amplifiers.
640.9(D) Use of Audio Transformers and Autotransformers.
640.10 Audio Systems Near Bodies of Water.
640.10(A) Equipment Supplied by Branch-Circuit Power. <\/td>\n<\/tr>\n
673<\/td>\n640.10(B) Equipment Not Supplied by Branch-Circuit Power.
Part II. Permanent Audio System Installations 640.21 Use of Flexible Cords and Cables. 640.21(A) Between Equipment and Branch-Ci
640.21(B) Between Loudspeakers and Amplifiers or Between Loudspeakers.
640.21(C) Between Equipment.
640.21(D) Between Equipment and Power Supplies Other Than Branch-Circuit Power.
640.21(E) Between Equipment Racks and Premises Wiring System.
640.22 Wiring of Equipment Racks and Enclosures.
640.23 Conduit or Tubing. 640.23(A) Number of Conductors.
640.23(B) Nonmetallic Conduit or Tubing and Insulating Bushings.
640.24 Wireways, Gutters, and Auxiliary Gutters.
640.25 Loudspeaker Installation in Fire Resistance\u2013Rated Partitions, Walls, and Ceilings.
Part III. Portable and Temporary Audio System Installations 640.41 Multipole Branch-Circuit Cable Connectors. <\/td>\n<\/tr>\n
674<\/td>\n640.42 Use of Flexible Cords and Cables. 640.42(A) Between Equipment and Branch-Circuit Power.
640.42(B) Between Loudspeakers and Amplifiers, or Between Loudspeakers.
640.42(C) Between Equipment and\/or Between Equipment Racks.
640.42(D) Between Equipment, Equipment Racks, and Power Supplies Other Than Branch-Circuit Power.
640.42(E) Between Equipment Racks and Branch-Circuit Power.
640.43 Wiring of Equipment Racks.
640.44 Environmental Protection of Equipment.
640.45 Protection of Wiring.
640.46 Equipment Access.
ARTICLE 645 Information Technology Equipment 645.1 Scope.
645.2 Definitions.
Abandoned Supply Circuits and Interconnecting Cables. <\/td>\n<\/tr>\n
675<\/td>\nCritical Operations Data System.
Remote Disconnect Control.
Zone.
645.3 Other Articles.
645.3(A) Spread of Fire or Products of Combustion.
645.3(B) Wiring and Cabling in Other Spaces Used for Environmental Air (Plenums).
645.3(C) Bonding and Grounding.
645.3(D) Electrical Classification of Data Circuits.
645.3(E) Fire Alarm Cables and Equipment.
645.3(F) Cable Routing Assemblies, Communications Wires, Cables, Raceways, and Equipment.
645.3(G) Community Antenna Television and Radio Distribution Systems Cables and Equipment.
645.3(H) Optical Fiber Cables.
645.3(I) Cables Not in Information Technology Equipment Room.
645.4 Special Requirements for Information Technology Equipment Room. <\/td>\n<\/tr>\n
676<\/td>\n645.5 Supply Circuits and Interconnecting Cables. 645.5(A) Branch-Circuit Conductors.
645.5(B) Power-Supply Cords.
645.5(C) Interconnecting Cables.
645.5(D) Physical Protection.
645.5(E) Under Raised Floors.
645.5(E)(1) Installation Requirements for Branch Circuit Supply Conductors Under a Raised Floor.
645.5(E)(2) Installation Requirements for Electrical Supply Cords, Data Cables, Interconnecting Cables, and Grounding Conductors <\/td>\n<\/tr>\n
677<\/td>\n645.5(E)(3) Installation Requirements for Optical Fiber Cables Under a Raised Floor.
645.5(F) Securing in Place.
645.5(G) Abandoned Supply Circuits and Interconnecting Cables.
645.5(H) Installed Supply Circuits and Interconnecting Cables Identified for Future Use. 645.5(H)(1)
645.5(H)(2)
645.10 Disconnecting Means.
645.10(A) Remote Disconnect Controls. 645.10(A)(1)
645.10(A)(2)
645.10(A)(3)
645.10(A)(4)
645.10(B) Critical Operations Data Systems. <\/td>\n<\/tr>\n
678<\/td>\n645.11 Uninterruptible Power Supply (UPS).
645.14 System Grounding.
645.15 Equipment Grounding and Bonding.
645.16 Marking.
645.17 Power Distribution Units.
645.18 Surge Protection for Critical Operations Data Systems.
645.25 Engineering Supervision.
645.27 Selective Coordination.
ARTICLE 646 Modular Data Centers Part I. General 646.1 Scope. <\/td>\n<\/tr>\n
679<\/td>\n646.2 Definitions.
Modular Data Center (MDC).
646.3 Other Articles.
646.3(A) Spread of Fire or Products of Combustion.
646.3(B) Wiring and Cabling in Other Spaces Used for Environmental Air (Plenums).
646.3(C) Grounding.
646.3(D) Electrical Classification of Data Circuits.
646.3(E) Fire Alarm Equipment.
646.3(F) Cable Routing Assemblies and Communications Wires, Cables, Raceways, and Equipment.
646.3(G) Community Antenna Television and Radio Distribution Systems Cables and Equipment.
646.3(H) Storage Batteries.
646.3(I) Surge-Protective Devices (SPDs). <\/td>\n<\/tr>\n
680<\/td>\n646.3(J) Lighting.
646.3(K) Power Distribution Wiring and Wiring Protection.
646.3(L) Wiring Methods and Materials.
646.3(M) Service Equipment.
646.3(N) Disconnecting Means.
646.4 Applicable Requirements.
646.5 Nameplate Data.
646.6 Supply Conductors and Overcurrent Protection. 646.6(A) Size.
646.6(B) Overcurrent Protection.
646.6(B)(1) Service Equipment \u2014 Overcurrent Protection. <\/td>\n<\/tr>\n
681<\/td>\n646.6(B)(2) Taps and Feeders.
646.7 Short-Circuit Current Rating. 646.7(A) Service Equipment.
646.7(B) MDCs Connected to Branch Circuits and Feeders.
646.7(C) MDCs Powered from Separate MDC System Enclosures.
646.8 Field-Wiring Compartments.
646.9 Flexible Power Cords and Cables for Connecting Equipment Enclosures of an MDC System. 646.9(A) Uses Permitted.
646.9(B) Uses Not Permitted.
646.9(C) Listing.
646.9(D) Single-Conductor Cable.
Part II. Equipment 646.10 Electrical Supply and Distribution.
646.11 Distribution Transformers. 646.11(A) Utility-Owned Transformers.
646.11(B) Non-Utility-Owned Premises Transformers.
646.11(C) Power Transformers. <\/td>\n<\/tr>\n
682<\/td>\n646.12 Receptacles.
646.13 Other Electrical Equipment.
646.14 Installation and Use.
Part III. Lighting 646.15 General Illumination.
646.16 Emergency Lighting.
646.17 Emergency Lighting Circuits.
Part IV. Workspace 646.18 General.
646.19 Entrance to and Egress from Working Space.
646.19(A) Unobstructed Egress.
646.19(B) Extra Working Space.
646.20 Working Space for ITE. 646.20(A) Low-Voltage Circuits.
646.20(B) Other Circuits.
646.21 Work Areas and Working Space About Batteries.
646.22 Workspace for Routine Service and Maintenance.
ARTICLE 647 Sensitive Electronic Equipment <\/td>\n<\/tr>\n
683<\/td>\n647.1 Scope.
647.3 General.
647.4 Wiring Methods. 647.4(A) Panelboards and Overcurrent Protection.
647.4(B) Junction Boxes.
647.4(C) Conductor Identification.
647.4(D) Voltage Drop.
647.4(D)(1) Fixed Equipment.
647.4(D)(2) Cord-Connected Equipment.
647.5 Three-Phase Systems.
647.6 Grounding. 647.6(A) General.
647.6(B) Equipment Grounding Conductors Required.
647.7 Receptacles. 647.7(A) General. <\/td>\n<\/tr>\n
684<\/td>\n647.7(B) Isolated Ground Receptacles.
647.8 Lighting Equipment.
647.8(A) Disconnecting Means.
647.8(B) Luminaires.
647.8(C) Screw Shell.
ARTICLE 650 Pipe Organs 650.1 Scope.
650.2 Definitions.
Electronic Organ.
Pipe Organ.
Pipe Organ Sounding Apparatus.
650.3 Other Articles.
650.3(A) Electronic Organ Equipment.
650.3(B) Optical Fiber Cable.
650.4 Source of Energy.
650.5 Grounding or Double Insulation of the DC Power Supply. <\/td>\n<\/tr>\n
685<\/td>\n650.6 Conductors.
650.6(A) Size.
650.6(B) Insulation.
650.6(C) Conductors to Be Cabled.
650.6(D) Cable Covering.
650.7 Installation of Conductors.
650.8 Overcurrent Protection.
650.9 Protection from Accidental Contact.
ARTICLE 660 X-Ray Equipment Part I. General 660.1 Scope.
660.2 Definitions.
Long-Time Rating.
Mobile.
Momentary Rating.
Portable. <\/td>\n<\/tr>\n
686<\/td>\nTransportable.
660.3 Hazardous (Classified) Locations.
660.4 Connection to Supply Circuit. 660.4(A) Fixed and Stationary Equipment.
660.4(B) Portable, Mobile, and Transportable Equipment.
660.4(C) Over 1000 Volts, Nominal.
660.5 Disconnecting Means.
660.6 Rating of Supply Conductors and Overcurrent Protection. 660.6(A) Branch-Circuit Conductors.
660.6(B) Feeder Conductors.
660.7 Wiring Terminals.
660.9 Minimum Size of Conductors.
660.10 Equipment Installations.
Part II. Control 660.20 Fixed and Stationary Equipment. 660.20(A) Separate Control Device.
660.20(B) Protective Device.
660.21 Portable and Mobile Equipment.
660.23 Industrial and Commercial Laboratory Equipment. <\/td>\n<\/tr>\n
687<\/td>\n660.23(A) Radiographic and Fluoroscopic Types.
660.23(B) Diffraction and Irradiation Types.
660.24 Independent Control.
Part III. Transformers and Capacitors 660.35 General.
660.36 Capacitors.
Part IV. Guarding and Grounding 660.47 General. 660.47(A) High-Voltage Parts.
660.47(B) Low-Voltage Cables.
660.48 Grounding.
ARTICLE 665 Induction and Dielectric Heating Equipment Part I. General 665.1 Scope.
665.2 Definitions.
Applicator.
Converting Device.
Dielectric Heating.
Heating Equipment.
Induction Heating, Melting, and Welding. <\/td>\n<\/tr>\n
688<\/td>\n665.4 Hazardous (Classified) Locations.
665.5 Output Circuit.
665.7 Remote Control. 665.7(A) Multiple Control Points.
665.7(B) Foot Switches.
665.10 Ampacity of Supply Conductors.
665.10(A) Nameplate Rating.
665.10(B) Motor-Generator Equipment.
665.11 Overcurrent Protection.
665.12 Disconnecting Means.
Part II. Guarding, Grounding, and Labeling 665.19 Component Interconnection.
665.20 Enclosures.
665.21 Control Panels.
665.22 Access to Internal Equipment.
665.23 Hazard Labels or Signs.
665.24 Capacitors.
665.25 Dielectric Heating Applicator Shielding. <\/td>\n<\/tr>\n
689<\/td>\n665.26 Grounding and Bonding.
665.27 Marking.
ARTICLE 668 Electrolytic Cells 668.1 Scope.
668.2 Definitions.
Cell Line.
Cell Line Attachments and Auxiliary Equipment.
Electrically Connected.
Electrolytic Cell.
Electrolytic Cell Line Working Zone.
668.3 Other Articles. 668.3(A) Lighting, Ventilating, Material Handling.
668.3(B) Systems Not Electrically Connected.
668.3(C) Electrolytic Cell Lines.
668.3(C)(1) Conductors.
668.3(C)(2) Overcurrent Protection. <\/td>\n<\/tr>\n
690<\/td>\n668.3(C)(3) Grounding.
668.3(C)(4) Working Zone.
668.10 Cell Line Working Zone. 668.10(A) Area Covered.
668.10(B) Area Not Covered.
668.11 Direct-Current Cell Line Process Power Supply. 668.11(A) Not Grounded.
668.11(B) Metal Enclosures Grounded.
668.11(C) Grounding Requirements.
668.12 Cell Line Conductors. 668.12(A) Insulation and Material.
668.12(B) Size.
668.12(C) Connections.
668.13 Disconnecting Means. 668.13(A) More Than One Process Power Supply.
668.13(B) Removable Links or Conductors.
668.14 Shunting Means. 668.14(A) Partial or Total Shunting.
668.14(B) Shunting One or More Cells.
668.15 Grounding.
668.20 Portable Electrical Equipment. <\/td>\n<\/tr>\n
691<\/td>\n668.20(A) Portable Electrical Equipment Not to Be Grounded.
668.20(B) Isolating Transformers.
668.20(C) Marking.
668.21 Power-Supply Circuits and Receptacles for Portable Electrical Equipment. 668.21(A) Isolated Circuits.
668.21(B) Noninterchangeability.
668.21(C) Marking.
668.30 Fixed and Portable Electrical Equipment. 668.30(A) Electrical Equipment Not Required to Be Grounded.
668.30(B) Exposed Conductive Surfaces Not Required to Be Grounded.
668.30(C) Wiring Methods.
668.30(D) Circuit Protection.
668.30(E) Bonding.
668.31 Auxiliary Nonelectrical Connections.
668.32 Cranes and Hoists. 668.32(A) Conductive Surfaces to Be Insulated from Ground.
668.32(B) Hazardous Electrical Conditions. <\/td>\n<\/tr>\n
692<\/td>\n668.40 Enclosures.
ARTICLE 669 Electroplating 669.1 Scope.
669.3 General.
669.5 Branch-Circuit Conductors.
669.6 Wiring Methods.
669.6(A) Systems Not Exceeding 60 Volts Direct Current.
669.6(B) Systems Exceeding 60 Volts Direct Current.
669.7 Warning Signs.
669.8 Disconnecting Means. 669.8(A) More Than One Power Supply.
669.8(B) Removable Links or Conductors.
669.9 Overcurrent Protection.
ARTICLE 670 Industrial Machinery 670.1 Scope.
670.2 Definition.
Industrial Machinery (Machine).
670.3 Machine Nameplate Data. <\/td>\n<\/tr>\n
693<\/td>\n670.3(A) Permanent Nameplate.
670.3(B) Overcurrent Protection.
670.4 Supply Conductors and Overcurrent Protection. 670.4(A) Size.
670.4(B) Disconnecting Means.
670.4(C) Overcurrent Protection.
670.5 Short-Circuit Current Rating. 670.5(1)
670.5(2)
670.6 Surge Protection.
ARTICLE 675 Electrically Driven or Controlled Irrigation Machines Part I. General 675.1 Scope.
675.2 Definitions. <\/td>\n<\/tr>\n
694<\/td>\nCenter Pivot Irrigation Machine.
Collector Rings.
Irrigation Machine.
675.4 Irrigation Cable. 675.4(A) Construction.
675.4(B) Alternate Wiring Methods.
675.4(C) Supports.
675.4(D) Fittings.
675.5 More Than Three Conductors in a Raceway or Cable.
675.6 Marking on Main Control Panel.
675.7 Equivalent Current Ratings.
675.7(A) Continuous-Current Rating.
675.7(B) Locked-Rotor Current.
675.8 Disconnecting Means. 675.8(A) Main Controller.
675.8(B) Main Disconnecting Means. <\/td>\n<\/tr>\n
695<\/td>\n675.8(C) Disconnecting Means for Individual Motors and Controllers.
675.9 Branch-Circuit Conductors.
675.10 Several Motors on One Branch Circuit. 675.10(A) Protection Required.
675.10(B) Individual Protection Not Required.
675.11 Collector Rings. 675.11(A) Transmitting Current for Power Purposes.
675.11(B) Control and Signal Purposes.
675.11(C) Grounding.
675.11(D) Protection.
675.12 Grounding.
675.13 Methods of Grounding.
675.14 Bonding.
675.15 Lightning Protection.
675.16 Energy from More Than One Source.
675.17 Connectors. <\/td>\n<\/tr>\n
696<\/td>\nPart II. Center Pivot Irrigation Machines 675.21 General.
675.22 Equivalent Current Ratings.
675.22(A) Continuous-Current Rating.
675.22(B) Locked-Rotor Current.
ARTICLE 680 Swimming Pools, Fountains, and Similar Installations Part I. General 680.1 Scope.
680.2 Definitions.
Cord-and-Plug-Connected Lighting Assembly.
Corrosive Environment.
Dry-Niche Luminaire.
Electrically Powered Pool Lift.
Fixed (as applied to equipment).
Forming Shell.
Fountain.
Hydromassage Bathtub.
Immersion Pool. <\/td>\n<\/tr>\n
697<\/td>\nLow Voltage Contact Limit.
Maximum Water Level.
No-Niche Luminaire.
Packaged Spa or Hot Tub Equipment Assembly.
Packaged Therapeutic Tub or Hydrotherapeutic Tank Equipment Assembly.
Permanently Installed Decorative Fountains and Reflection Pools.
Permanently Installed Swimming, Wading, Immersion, and Therapeutic Pools.
Pool.
Pool Cover, Electrically Operated.
Portable (as applied to equipment).
Self-Contained Spa or Hot Tub.
Self-Contained Therapeutic Tubs or Hydrotherapeutic Tanks.
Spa or Hot Tub.
Splash Pad.
Stationary (as applied to equipment). <\/td>\n<\/tr>\n
698<\/td>\nStorable Swimming, Wading, or Immersion Pools; or Storable\/Portable Spas and Hot Tubs.
Through-Wall Lighting Assembly.
Wet-Niche Luminaire.
680.3 Approval of Equipment.
680.4 Inspections After Installation.
680.5 Ground-Fault Circuit Interrupters.
680.6 Bonding and Equipment Grounding.
680.7 Bonding and Equipment Grounding Terminals.
680.8 Cord-and-Plug-Connected Equipment.
680.8(A) Length.
680.8(B) Equipment Grounding.
680.8(C) Construction.
680.9 Overhead Conductor Clearances.
680.9(A) Power. <\/td>\n<\/tr>\n
699<\/td>\nFigure 680.9(A) Clearances from Pool Structures. 680.9(B) Communications Systems.
680.9(C) Network-Powered Broadband Communications Systems.
680.10 Electric Pool Water Heaters.
680.11 Underground Wiring.
680.11(A) Underground Wiring.
680.11(B) Wiring Under Pools.
680.11(C) Minimum Cover Requirements.
680.12 Equipment Rooms and Pits. <\/td>\n<\/tr>\n
700<\/td>\n680.13 Maintenance Disconnecting Means.
680.14 Wiring Methods in Corrosive Environment.
Part II. Permanently Installed Pools 680.20 General.
680.21 Motors. 680.21(A) Wiring Methods.
680.21(A)(1) General.
680.21(A)(2) Flexible Connections.
680.21(A)(3) Cord-and-Plug Connections.
680.21(B) Double-Insulated Pool Pumps.
680.21(C) GFCI Protection.
680.21(D) Pool Pump Motor Replacement.
680.22 Lighting, Receptacles, and Equipment. 680.22(A) Receptacles. 680.22(A)(1) Required Receptacle, Location.
680.22(A)(2) Circulation and Sanitation System, Location.
680.22(A)(3) Other Receptacles, Location.
680.22(A)(4) GFCI Protection.
680.22(A)(5) Pool Equipment Room. <\/td>\n<\/tr>\n
701<\/td>\n680.22(A)(6) Measurements.
680.22(B) Luminaires, Lighting Outlets, and Ceiling-Suspended (Paddle) Fans. 680.22(B)(1) New Outdoor Installation Clearances.
680.22(B)(2) Indoor Clearances.
680.22(B)(3) Existing Installations.
680.22(B)(4) GFCI Protection in Adjacent Areas.
680.22(B)(5) Cord-and-Plug-Connected Luminaires.
680.22(B)(6) Low-Voltage Luminaires.
680.22(B)(7) Low-Voltage Gas-Fired Luminaires, Decorative Fireplaces, Fire Pits, and Similar Equipment.
680.22(B)(8) Measurements.
680.22(C) Switching Devices.
680.22(D) Other Outlets.
680.22(E) Other Equipment.
680.23 Underwater Luminaires.
680.23(A) General. 680.23(A)(1) Luminaire Design, Normal Operation.
680.23(A)(2) Transformers and Power Supplies. <\/td>\n<\/tr>\n
702<\/td>\n680.23(A)(3) GFCI Protection, Lamping, Relamping, and Servicing.
680.23(A)(4) Voltage Limitation.
680.23(A)(5) Location, Wall-Mounted Luminaires.
680.23(A)(6) Bottom-Mounted Luminaires.
680.23(A)(7) Dependence on Submersion.
680.23(A)(8) Compliance.
680.23(B) Wet-Niche Luminaires. 680.23(B)(1) Forming Shells.
680.23(B)(2) Wiring Extending Directly to the Forming Shell.
680.23(B)(3) Equipment Grounding Provisions for Cords.
680.23(B)(4) Luminaire Grounding Terminations.
680.23(B)(5) Luminaire Bonding.
680.23(B)(6) Servicing.
680.23(C) Dry-Niche Luminaires. 680.23(C)(1) Construction.
680.23(C)(2) Junction Box.
680.23(D) No-Niche Luminaires. <\/td>\n<\/tr>\n
703<\/td>\n680.23(E) Through-Wall Lighting Assembly.
680.23(F) Branch-Circuit Wiring. 680.23(F)(1) Wiring Methods.
680.23(F)(2) Equipment Grounding.
680.23(F)(3) Conductors.
680.24 Junction Boxes and Electrical Enclosures for Transformers or Ground-Fault Circuit Interrupters. 680.24(A) Junction Boxes.
680.24(A)(1) Construction.
680.24(A)(2) Installation.
680.24(B) Other Enclosures.
680.24(B)(1) Construction. <\/td>\n<\/tr>\n
704<\/td>\n680.24(B)(2) Installation.
680.24(C) Protection.
680.24(D) Grounding Terminals.
680.24(E) Strain Relief.
680.24(F) Grounding.
680.25 Feeders.
680.25(A) Feeders.
680.25(B) Aluminum Conduit.
680.26 Equipotential Bonding. 680.26(A) Performance.
680.26(B) Bonded Parts.
680.26(B)(1) Conductive Pool Shells.
680.26(B)(2) Perimeter Surfaces. <\/td>\n<\/tr>\n
705<\/td>\n680.26(B)(3) Metallic Components.
680.26(B)(4) Underwater Lighting.
680.26(B)(5) Metal Fittings.
680.26(B)(6) Electrical Equipment.
680.26(B)(7) Fixed Metal Parts.
680.26(C) Pool Water.
680.27 Specialized Pool Equipment. 680.27(A) Underwater Audio Equipment.
680.27(A)(1) Speakers.
680.27(A)(2) Wiring Methods.
680.27(A)(3) Forming Shell and Metal Screen.
680.27(B) Electrically Operated Pool Covers. 680.27(B)(1) Motors and Controllers. <\/td>\n<\/tr>\n
706<\/td>\n680.27(B)(2) Protection.
680.27(C) Deck Area Heating.
680.27(C)(1) Unit Heaters.
680.27(C)(2) Permanently Wired Radiant Heaters.
680.27(C)(3) Radiant Heating Cables Not Permitted.
680.28 Gas-Fired Water Heater.
Part III. Storable Pools, Storable Spas, Storable Hot Tubs, and Storable Immersion Pools 680.30 General.
680.31 Pumps.
680.32 Ground-Fault Circuit Interrupters Required.
680.33 Luminaires.
680.33(A) Within the Low Voltage Contact Limit.
680.33(B) Over the Low Voltage Contact Limit But Not over 150 Volts.
680.34 Receptacle Locations. <\/td>\n<\/tr>\n
707<\/td>\n680.35 Storable and Portable Immersion Pools.
680.35(A) Cord Connection for Self-Contained Storable and Portable Immersion Pools.
680.35(B) Storable and Portable Pumps.
680.35(C) Storable and Portable Heaters.
680.35(D) Audio Equipment.
680.35(E) Location Proximate to Luminaires, Lighting Outlets, and Ceiling-Suspended (Paddle) Fans.
680.35(F) Location Proximate to Switches.
680.35(G) Receptacles.
Part IV. Spas, Hot Tubs, and Permanently Installed Immersion Pools 680.40 General.
680.41 Emergency Switch for Spas and Hot Tubs.
680.42 Outdoor Installations.
680.42(A) Flexible Connections.
680.42(A)(1) Flexible Conduit.
680.42(A)(2) Cord-and-Plug Connections.
680.42(B) Bonding. <\/td>\n<\/tr>\n
708<\/td>\n680.42(C) Interior Wiring to Outdoor Installations.
680.43 Indoor Installations.
680.43(A) Receptacles.
680.43(A)(1) Location.
680.43(A)(2) Protection, General.
680.43(A)(3) Protection, Spa or Hot Tub Supply Receptacle.
680.43(A)(4) Measurements.
680.43(B) Installation of Luminaires, Lighting Outlets, and Ceiling-Suspended (Paddle) Fans. 680.43(B)(1) Elevation.
680.43(B)(2) Underwater Applications.
680.43(C) Switches.
680.43(D) Bonding.
680.43(E) Methods of Bonding. <\/td>\n<\/tr>\n
709<\/td>\n680.43(F) Grounding.
680.43(G) Underwater Audio Equipment.
680.44 Protection.
680.44(A) Listed Units.
680.44(B) Other Units.
680.45 Permanently Installed Immersion Pools.
680.45(A) Cord-and-Plug Connections.
680.45(B) Storable and Portable Pumps.
680.45(C) Heaters.
680.45(C)(1) Permanently Installed Heaters.
680.45(C)(2) Storable and Portable Heaters.
680.45(D) Audio Equipment.
Part V. Fountains <\/td>\n<\/tr>\n
710<\/td>\n680.50 General.
680.51 Luminaires, Submersible Pumps, and Other Submersible Equipment. 680.51(A) Ground-Fault Circuit Interrupter.
680.51(B) Operating Voltage.
680.51(C) Luminaire Lenses.
680.51(D) Overheating Protection.
680.51(E) Wiring.
680.51(F) Servicing.
680.51(G) Stability.
680.52 Junction Boxes and Other Enclosures. 680.52(A) General.
680.52(B) Underwater Junction Boxes and Other Underwater Enclosures.
680.52(B)(1) Construction.
680.52(B)(2) Installation.
680.54 Grounding and Bonding. 680.54(A) Grounding.
680.54(B) Bonding. <\/td>\n<\/tr>\n
711<\/td>\n680.55 Methods of Grounding. 680.55(A) Applied Provisions.
680.55(B) Supplied by a Flexible Cord.
680.56 Cord-and-Plug-Connected Equipment. 680.56(A) Ground-Fault Circuit Interrupter.
680.56(B) Cord Type.
680.56(C) Sealing.
680.56(D) Terminations.
680.57 Signs. 680.57(A) General.
680.57(B) Ground-Fault Circuit-Interrupter Protection for Personnel.
680.57(C) Location. 680.57(C)(1) Fixed or Stationary.
680.57(C)(2) Portable.
680.57(D) Disconnect.
680.57(E) Bonding and Grounding.
680.58 GFCI Protection for Adjacent Receptacle Outlets.
680.59 GFCI Protection for Permanently Installed Nonsubmersible Pumps.
Part VI. Pools and Tubs for Therapeutic Use 680.60 General. <\/td>\n<\/tr>\n
712<\/td>\n680.61 Permanently Installed Therapeutic Pools.
680.62 Therapeutic Tubs (Hydrotherapeutic Tanks).
680.62(A) Protection.
680.62(A)(1) Listed Units.
680.62(A)(2) Other Units.
680.62(B) Bonding.
680.62(C) Methods of Bonding.
680.62(D) Grounding. 680.62(D)(1) Fixed or Stationary Equipment.
680.62(D)(2) Portable Equipment.
680.62(E) Receptacles.
680.62(F) Luminaires.
Part VII. Hydromassage Bathtubs 680.70 General.
680.71 Protection.
680.72 Other Electrical Equipment. <\/td>\n<\/tr>\n
713<\/td>\n680.73 Accessibility.
680.74 Bonding. 680.74(A) General.
680.74(B) Bonding Conductor.
Part VIII. Electrically Powered Pool Lifts 680.80 General.
680.81 Equipment Approval.
680.82 Protection.
680.83 Bonding.
680.84 Switching Devices and Receptacles.
680.85 Nameplate Marking.
ARTICLE 682 Natural and Artificially Made Bodies of Water Part I. General 682.1 Scope.
682.2 Definitions. <\/td>\n<\/tr>\n
714<\/td>\nArtificially Made Bodies of Water.
Natural Bodies of Water.
Shoreline.
682.3 Other Articles.
682.4 Industrial Application.
682.5 Electrical Datum Plane Distances.
Part II. Installation 682.10 Electrical Equipment and Transformers.
682.11 Location of Service Equipment.
682.12 Electrical Connections.
682.13 Wiring Methods and Installation.
682.14 Submersible or Floating Equipment Power Connection(s).
682.14(A) Type and Marking.
682.14(B) Location.
682.15 Ground-Fault Protection. <\/td>\n<\/tr>\n
715<\/td>\n682.15(A) Outlets.
682.15(B) Feeder and Branch Circuits on Piers.
Part III. Grounding and Bonding 682.30 Grounding.
682.31 Equipment Grounding Conductors. 682.31(A) Type.
682.31(B) Feeders.
682.31(C) Branch Circuits.
682.31(D) Cord-and-Plug-Connected Appliances.
682.32 Bonding of Non\u2013Current-Carrying Metal Parts.
682.33 Equipotential Planes and Bonding of Equipotential Planes.
682.33(A) Areas Requiring Equipotential Planes.
682.33(B) Areas Not Requiring Equipotential Planes.
682.33(C) Bonding. 682.33(C)(1) Bonded Parts.
682.33(C)(2) Outdoor Service Equipment and Disconnects.
682.33(C)(3) Walking Surfaces.
ARTICLE 685 Integrated Electrical Systems Part I. General 685.1 Scope. <\/td>\n<\/tr>\n
716<\/td>\n685.3 Application of Other Articles.
Part II. Orderly Shutdown 685.10 Location of Overcurrent Devices in or on Premises.
685.12 Direct-Current System Grounding.
685.14 Ungrounded Control Circuits.
ARTICLE 690 Solar Photovoltaic (PV) Systems Part I. General 690.1 Scope.
Informational Note Figure 690.1(a) Identification of PV Power Source Components. <\/td>\n<\/tr>\n
717<\/td>\nInformational Note Figure 690.1(b) Identification of PV System Components in Common Configurations. <\/td>\n<\/tr>\n
718<\/td>\n690.2 Definitions.
AC Module System.
Alternating-Current (ac) Module (Alternating-Current Photovoltaic Module).
Array.
Bipolar Circuit. <\/td>\n<\/tr>\n
719<\/td>\nDC-to-DC Converter Output Circuit.
DC-to-DC Converter Source Circuit.
Direct-Current (dc) Combiner.
Electronic Power Converter.
Grounded, Functionally.
Module.
Monopole Circuit.
PV Output Circuit.
PV Source Circuit.
PV System DC Circuit.
Solar Cell.
690.4 General Requirements. 690.4(A) Photovoltaic Systems.
690.4(B) Equipment.
690.4(C) Qualified Personnel.
690.4(D) Multiple PV Systems.
690.4(E) Locations Not Permitted.
690.4(F) Electronic Power Converters Mounted in Not Readily Accessible Locations. <\/td>\n<\/tr>\n
720<\/td>\n690.6 Alternating-Current (ac) Modules and Systems. 690.6(A) Photovoltaic Source Circuits.
690.6(B) Output Circuit.
Part II. Circuit Requirements 690.7 Maximum Voltage.
690.7(A) Photovoltaic Source and Output Circuits.
690.7(B) DC-to-DC Converter Source and Output Circuits.
690.7(B)(1) Single DC-to-DC Converter. <\/td>\n<\/tr>\n
721<\/td>\n690.7(B)(2) Two or More Series-Connected DC-to-DC Converters.
690.7(C) Bipolar Source and Output Circuits.
690.8 Circuit Sizing and Current. 690.8(A) Calculation of Maximum Circuit Current.
690.8(A)(1) PV System Circuits.
690.8(A)(2) Circuits Connected to the Input of Electronic Power Converters.
690.8(B) Conductor Ampacity.
690.8(B)(1) Without Adjustment and Correction Factors.
690.8(B)(2) With Adjustment and Correction Factors.
690.8(C) Systems with Multiple Direct-Current Voltages.
690.8(D) Sizing of Module Interconnection Conductors.
690.9 Overcurrent Protection. 690.9(A) Circuits and Equipment.
690.9(A)(1) Circuits Where Overcurrent Protection Not Required.
690.9(A)(2) Circuits Where Overcurrent Protection is Required on One End. <\/td>\n<\/tr>\n
722<\/td>\n690.9(A)(3) Other Circuits.
690.9(B) Device Ratings.
690.9(C) Source and Output Circuits.
690.9(D) Power Transformers.
690.10 Stand-Alone Systems.
690.11 Arc-Fault Circuit Protection (Direct Current).
690.12 Rapid Shutdown of PV Systems on Buildings.
690.12(A) Controlled Conductors.
690.12(B) Controlled Limits.
690.12(B)(1) Outside the Array Boundary. <\/td>\n<\/tr>\n
723<\/td>\n690.12(B)(2) Inside the Array Boundary.
690.12(C) Initiation Device.
690.12(D) Equipment.
Part III. Disconnecting Means 690.13 Photovoltaic System Disconnecting Means.
690.13(A) Location.
690.13(B) Marking.
690.13(C) Maximum Number of Disconnects.
690.13(D) Ratings.
690.13(E) Type of Disconnect. <\/td>\n<\/tr>\n
724<\/td>\n690.15 Disconnecting Means for Isolating Photovoltaic Equipment.
690.15(A) Location.
690.15(B) Isolating Device.
690.15(C) Equipment Disconnecting Means.
690.15(D) Type of Disconnecting Means.
Part IV. Wiring Methods and Materials 690.31 Wiring Methods. 690.31(A) Wiring Systems. <\/td>\n<\/tr>\n
725<\/td>\n690.31(B) Identification and Grouping. <\/td>\n<\/tr>\n
726<\/td>\n690.31(B)(1) Identification.
690.31(B)(2) Grouping.
690.31(C) Cables.
690.31(C)(1) Single-Conductor Cable.
690.31(C)(2) Cable Tray.
690.31(C)(3) Multiconductor Jacketed Cables.
690.31(C)(4) Flexible Cords and Cables Connected to Tracking PV Arrays. <\/td>\n<\/tr>\n
727<\/td>\n690.31(C)(5) Flexible, Fine-Stranded Cables.
690.31(C)(6) Small-Conductor Cables.
690.31(D) Direct-Current Circuits on or in Buildings.
690.31(D)(1) Flexible Wiring Methods.
690.31(D)(2) Marking and Labeling Required.
690.31(E) Bipolar Photovoltaic Systems.
690.31(F) Wiring Methods and Mounting Systems.
690.32 Component Interconnections.
690.33 Mating Connectors.
690.33(A) Configuration.
690.33(B) Guarding.
690.33(C) Type. <\/td>\n<\/tr>\n
728<\/td>\n690.33(D) Interruption of Circuit.
690.34 Access to Boxes.
Part V. Grounding and Bonding 690.41 System Grounding. 690.41(A) PV System Grounding Configurations.
690.41(B) Ground-Fault Protection.
690.41(B)(1) Ground-Fault Detection.
690.41(B)(2) Faulted Circuits.
690.41(B)(3) Indication of Faults.
690.42 Point of System Grounding Connection.
690.43 Equipment Grounding and Bonding.
690.43(A) Photovoltaic Module Mounting Systems and Devices.
690.43(B) Equipment Secured to Grounded Metal Supports.
690.43(C) With Circuit Conductors. <\/td>\n<\/tr>\n
729<\/td>\n690.43(D) Bonding for Over 250 Volts.
690.45 Size of Equipment Grounding Conductors.
690.47 Grounding Electrode System. 690.47(A) Buildings or Structures Supporting a PV System.
690.47(B) Grounding Electrodes and Grounding Electrode Conductors.
Part VI. Marking 690.51 Modules and AC Modules.
690.53 DC PV Circuits.
690.54 Interactive System Point of Interconnection.
690.55 Photovoltaic Systems Connected to Energy Storage Systems.
690.56 Identification of Power Sources. 690.56(A) Facilities with Stand-Alone Systems.
690.56(B) Facilities with Utility Services and Photovoltaic Systems.
690.56(C) Buildings with Rapid Shutdown. <\/td>\n<\/tr>\n
730<\/td>\nInformational Note Figure 690.56(C) Label for Roof-Mounted PV Systems with Rapid Shutdown. 690.56(C)(1) Buildings with More Than
690.56(C)(2) Rapid Shutdown Switch.
Part VII. Connection to Other Sources 690.59 Connection to Other Sources.
Part VIII. Energy Storage Systems 690.71 General.
690.72 Self-Regulated PV Charge Control.
ARTICLE 691 Large-Scale Photovoltaic (PV) Electric Supply Stations 691.1 Scope.
Informational Note Figure 691.1 Identification of Large-Scale PV Electric Supply Station Components. <\/td>\n<\/tr>\n
731<\/td>\n691.2 Definitions.
Electric Supply Stations.
Generating Station.
691.4 Special Requirements for Large-Scale PV Electric Supply Stations.
691.5 Equipment.
691.6 Engineered Design.
691.7 Conformance of Construction to Engineered Design.
691.8 Direct Current Operating Voltage.
691.9 Disconnecting Means for Isolating Photovoltaic Equipment. <\/td>\n<\/tr>\n
732<\/td>\n691.10 Arc-Fault Mitigation.
691.11 Fence Bonding and Grounding.
ARTICLE 692 Fuel Cell Systems Part I. General 692.1 Scope.
692.2 Definitions.
Fuel Cell Output Circuit.
692.4 Installation. 692.4(A) Fuel Cell System.
692.4(B) Identification of Power Sources.
692.4(B)(1) Interconnected AC Systems.
692.4(B)(2) DC Microgrid Systems.
692.4(B)(3) Stand-Alone Systems.
692.4(C) System Installation.
692.6 Listing Requirement.
Part II. Circuit Requirements 692.8 Circuit Sizing and Current. 692.8(A) Nameplate Rated Circuit Current. <\/td>\n<\/tr>\n
733<\/td>\n692.8(B) Conductor Ampacity and Overcurrent Device Ratings.
692.8(C) Ampacity of Grounded or Neutral Conductor.
692.9 Overcurrent Protection. 692.9(A) Circuits and Equipment.
692.9(B) Accessibility.
Part III. Disconnecting Means 692.13 All Conductors.
692.17 Switch or Circuit Breaker.
Part IV. Wiring Methods 692.31 Wiring Systems.
Part V. Grounding 692.41 System Grounding. 692.41(A) AC Systems.
692.41(B) DC Systems.
692.41(C) Systems with Alternating-Current and Direct-Current Grounding Requirements.
692.44 Equipment Grounding Conductor.
692.45 Size of Equipment Grounding Conductor.
692.47 Grounding Electrode System.
Part VI. Marking 692.53 Fuel Cell Power Sources. <\/td>\n<\/tr>\n
734<\/td>\n692.54 Fuel Shut-Off.
692.56 Stored Energy.
Part VII. Connection to Other Circuits 692.59 Transfer Switch.
692.60 Identified Interactive Equipment.
692.61 Output Characteristics.
692.62 Loss of Interactive System Power.
692.64 Unbalanced Interconnections.
692.65 Utility-Interactive Point of Connection.
ARTICLE 694 Wind Electric Systems Part I. General 694.1 Scope.
Figure 694.1(a) Identification of Wind Electric System Components \u2014 Interactive System. Figure 694.1(b) Identification of Wind E <\/td>\n<\/tr>\n
735<\/td>\n694.2 Definitions.
Diversion Charge Controller.
Diversion Load.
Diversion Load Controller.
Maximum Output Power.
Maximum Voltage.
Nacelle.
Rated Power.
Tower (as applied to wind electric systems).
Wind Turbine.
Wind Turbine Output Circuit.
694.7 Installation.
694.7(A) Wind Electric Systems. <\/td>\n<\/tr>\n
736<\/td>\n694.7(B) Equipment.
694.7(C) Diversion Load Controllers.
694.7(D) Surge Protective Devices (SPD).
694.7(E) Receptacles.
694.7(F) Poles or Towers Supporting Wind Turbines Used as a Raceway.
694.7(G) Working Clearances.
Part II. Circuit Requirements 694.10 Maximum Voltage. 694.10(A) Wind Turbine Output Circuits.
694.10(B) Direct-Current Utilization Circuits.
694.10(C) Circuits over 150 Volts to Ground.
694.12 Circuit Sizing and Current. 694.12(A) Calculation of Maximum Circuit Current.
694.12(A)(1) Turbine Output Circuit Currents. <\/td>\n<\/tr>\n
737<\/td>\n694.12(A)(2) Inverter Output Circuit Current.
694.12(A)(3) Stand-Alone Inverter Input Circuit Current.
694.12(B) Ampacity and Overcurrent Device Ratings. 694.12(B)(1) Continuous Current.
694.12(B)(2) Sizing of Conductors and Overcurrent Devices.
694.15 Overcurrent Protection. 694.15(A) Circuits and Equipment.
694.15(B) Power Transformers.
694.15(C) Direct-Current Rating.
Part III. Disconnecting Means 694.20 All Conductors.
694.22 Additional Provisions.
694.22(A) Disconnecting Means. <\/td>\n<\/tr>\n
738<\/td>\n694.22(B) Equipment.
694.22(C) Requirements for Disconnecting Means. 694.22(C)(1) Location.
694.22(C)(2) Marking.
694.22(C)(3) Suitable for Use.
694.22(C)(4) Maximum Number of Disconnects.
694.22(D) Equipment That Is Not Readily Accessible.
694.23 Turbine Shutdown. 694.23(A) Manual Shutdown.
694.23(B) Shutdown Procedure.
694.24 Disconnection of Wind Electric System Equipment.
694.26 Fuses.
694.28 Installation and Service of a Wind Turbine.
Part IV. Wiring Methods 694.30 Permitted Methods. 694.30(A) Wiring Systems.
694.30(B) Flexible Cords and Cables. <\/td>\n<\/tr>\n
739<\/td>\n694.30(C) Direct-Current Turbine Output Circuits Inside a Building.
Part V. Grounding and Bonding 694.40 Equipment Grounding and Bonding. 694.40(A) General.
694.40(B) Tower Grounding and Bonding. 694.40(B)(1) Grounding Electrodes and Grounding Electrode Conductors.
694.40(B)(2) Bonding Conductor.
694.40(B)(3) Tower Connections.
694.40(B)(4) Guy Wires.
Part VI. Marking 694.50 Interactive System Point of Interconnection.
694.52 Power Systems Employing Energy Storage.
694.54 Identification of Power Sources.
694.54(A) Interconnected AC Systems.
694.54(B) DC Microgrid Systems.
694.54(C) Stand-Alone Systems.
694.56 Instructions for Disabling Turbine.
Part VII. Connection to Other Sources 694.60 Identified Interactive Equipment.
694.62 Installation.
694.66 Operating Voltage Range. <\/td>\n<\/tr>\n
740<\/td>\n694.68 Point of Connection.
ARTICLE 695 Fire Pumps 695.1 Scope. 695.1(A) Covered.
695.1(B) Not Covered.
695.2 Definitions.
Fault-Tolerant External Control Circuits.
On-Site Power Production Facility.
On-Site Standby Generator.
695.3 Power Source(s) for Electric Motor-Driven Fire Pumps.
695.3(A) Individual Sources.
695.3(A)(1) Electric Utility Service Connection.
695.3(A)(2) On-Site Power Production Facility.
695.3(A)(3) Dedicated Feeder.
695.3(B) Multiple Sources. <\/td>\n<\/tr>\n
741<\/td>\n695.3(B)(1) Individual Sources.
695.3(B)(2) Individual Source and On-site Standby Generator.
695.3(C) Multibuilding Campus-Style Complexes.
695.3(C)(1) Feeder Sources.
695.3(C)(2) Feeder and Alternate Source.
695.3(C)(3) Selective Coordination.
695.3(D) On-Site Standby Generator as Alternate Source.
695.3(D)(1) Capacity.
695.3(D)(2) Connection.
695.3(D)(3) Adjacent Disconnects.
695.3(E) Arrangement.
695.3(F) Transfer of Power.
695.3(G) Power Source Selection.
695.3(H) Overcurrent Device Selection.
695.3(I) Phase Converters.
695.4 Continuity of Power.
695.4(A) Direct Connection.
695.4(B) Connection Through Disconnecting Means and Overcurrent Device. <\/td>\n<\/tr>\n
742<\/td>\n695.4(B)(1) Number of Disconnecting Means.
695.4(B)(2) Overcurrent Device Selection.
695.4(B)(3) Disconnecting Means.
695.5 Transformers.
695.5(A) Size.
695.5(B) Overcurrent Protection.
695.5(C) Feeder Source.
695.5(C)(1) Size. <\/td>\n<\/tr>\n
743<\/td>\n695.5(C)(2) Overcurrent Protection.
695.6 Power Wiring.
695.6(A) Supply Conductors. 695.6(A)(1) Services and On-Site Power Production Facilities.
695.6(A)(2) Feeders.
695.6(B) Conductor Size. 695.6(B)(1) Fire Pump Motors and Other Equipment.
695.6(B)(2) Fire Pump Motors Only.
695.6(C) Overload Protection.
695.6(D) Pump Wiring.
695.6(E) Loads Supplied by Controllers and Transfer Switches.
695.6(F) Mechanical Protection.
695.6(G) Ground-Fault Protection of Equipment. <\/td>\n<\/tr>\n
744<\/td>\n695.6(H) Listed Electrical Circuit Protective System to Controller Wiring.
695.6(I) Junction Boxes.
695.6(J) Terminations.
695.7 Voltage Drop. 695.7(A) Starting.
695.7(B) Running.
695.10 Listed Equipment.
695.12 Equipment Location. 695.12(A) Controllers and Transfer Switches.
695.12(B) Engine-Drive Controllers.
695.12(C) Storage Batteries.
695.12(D) Energized Equipment.
695.12(E) Protection Against Pump Water.
695.12(F) Mounting.
695.14 Control Wiring. 695.14(A) Control Circuit Failures. <\/td>\n<\/tr>\n
745<\/td>\n695.14(B) Sensor Functioning.
695.14(C) Remote Device(s).
695.14(D) Engine-Drive Control Wiring.
695.14(E) Electric Fire Pump Control Wiring Methods.
695.14(F) Generator Control Wiring Methods.
695.15 Surge Protection.
Chapter 7 Special Conditions
ARTICLE 700 Emergency Systems Part I. General 700.1 Scope.
700.2 Definitions. Branch-Circuit Emergency Lighting Transfer Switch.
Emergency Luminaire, Directly Controlled. <\/td>\n<\/tr>\n
746<\/td>\nEmergency Systems.
Relay, Automatic Load Control.
700.3 Tests and Maintenance. 700.3(A) Conduct or Witness Test.
700.3(B) Tested Periodically.
700.3(C) Maintenance.
700.3(D) Written Record.
700.3(E) Testing Under Load.
700.3(F) Temporary Source of Power for Maintenance or Repair of the Alternate Source of Power.
Informational Note Figure 700.3(F) <\/td>\n<\/tr>\n
747<\/td>\n700.4 Capacity and Rating. 700.4(A) Rating.
700.4(B) Capacity.
700.4(C) Selective Load Pickup, Load Shedding, and Peak Load Shaving.
700.5 Transfer Equipment. 700.5(A) General.
700.5(B) Bypass Isolation Switches.
700.5(C) Automatic Transfer Switches.
700.5(D) Use. <\/td>\n<\/tr>\n
748<\/td>\n700.5(E) Documentation.
700.6 Signals.
700.6(A) Malfunction.
700.6(B) Carrying Load.
700.6(C) Not Functioning.
700.6(D) Ground Fault.
700.7 Signs. 700.7(A) Emergency Sources.
700.7(B) Grounding.
700.8 Surge Protection.
Part II. Circuit Wiring 700.10 Wiring, Emergency System. 700.10(A) Identification.
700.10(B) Wiring. <\/td>\n<\/tr>\n
749<\/td>\nInformational Note Figure 700.10(B)(a) Single or Multiple Feeders Without Overcurrent Protection. Informational Note Figure 700. <\/td>\n<\/tr>\n
750<\/td>\n700.10(C) Wiring Design and Location.
700.10(D) Fire Protection. 700.10(D)(1) Occupancies.
700.10(D)(2) Feeder-Circuit Wiring. <\/td>\n<\/tr>\n
751<\/td>\n700.10(D)(3) Feeder-Circuit Equipment.
700.10(D)(4) Generator Control Wiring.
Part III. Sources of Power 700.12 General Requirements.
700.12(A) Power Source Considerations.
700.12(B) Equipment Design and Location.
700.12(C) Storage Battery.
700.12(D) Generator Set. 700.12(D)(1) Prime Mover-Driven.
700.12(D)(2) Internal Combustion Engines as Prime Movers.
700.12(D)(3) Battery Power and Dampers.
700.12(D)(4) Auxiliary Power Supply.
700.12(D)(5) Outdoor Generator Sets. <\/td>\n<\/tr>\n
752<\/td>\n700.12(E) Uninterruptible Power Supplies.
700.12(F) Separate Service.
700.12(G) Fuel Cell System.
700.12(H) DC Microgrid Systems.
700.12(I) Unit Equipment. 700.12(I)(1) Components of Unit Equipment.
700.12(I)(2) Installation of Unit Equipment.
Part IV. Emergency System Circuits for Lighting and Power 700.15 Loads on Emergency Branch Circuits.
700.16 Emergency Illumination. 700.16(A) General. <\/td>\n<\/tr>\n
753<\/td>\n700.16(B) System Reliability.
700.16(C) Discharge Lighting.
700.16(D) Disconnecting Means.
700.17 Branch Circuits for Emergency Lighting.
700.18 Circuits for Emergency Power.
700.19 Multiwire Branch Circuits.
Part V. Control \u2014 Emergency Lighting Circuits 700.20 Switch Requirements.
700.21 Switch Location.
700.22 Exterior Lights.
700.23 Dimmer and Relay Systems.
700.24 Directly Controlled Emergency Luminaires.
700.25 Branch Circuit Emergency Lighting Transfer Switch.
700.26 Automatic Load Control Relay. <\/td>\n<\/tr>\n
754<\/td>\nPart VI. Overcurrent Protection 700.30 Accessibility.
700.31 Ground-Fault Protection of Equipment.
700.32 Selective Coordination.
Informational Note Figure 700.32 Emergency System Selective Coordination. <\/td>\n<\/tr>\n
755<\/td>\nARTICLE 701 Legally Required Standby Systems Part I. General 701.1 Scope.
701.2 Definition.
Legally Required Standby Systems. <\/td>\n<\/tr>\n
756<\/td>\n701.3 Tests and Maintenance. 701.3(A) Conduct or Witness Test.
701.3(B) Tested Periodically.
701.3(C) Maintenance.
701.3(D) Written Record.
701.3(E) Testing Under Load.
701.4 Capacity and Rating. 701.4(A) Rating.
701.4(B) Capacity.
701.4(C) Load Pickup, Load Shedding, and Peak Load Shaving.
701.5 Transfer Equipment. 701.5(A) General.
701.5(B) Bypass Isolation Switches.
701.5(C) Automatic Transfer Switches.
701.5(D) Documentation.
701.6 Signals.
701.6(A) Malfunction.
701.6(B) Carrying Load.
701.6(C) Not Functioning.
701.6(D) Ground Fault. <\/td>\n<\/tr>\n
757<\/td>\n701.7 Signs. 701.7(A) Mandated Standby.
701.7(B) Grounding.
Part II. Circuit Wiring 701.10 Wiring Legally Required Standby Systems.
Part III. Sources of Power 701.12 General Requirements.
701.12(A) Power Source Considerations.
701.12(B) Equipment Design and Location.
701.12(C) Storage Battery.
701.12(D) Generator Set. 701.12(D)(1) Prime Mover-Driven.
701.12(D)(2) Internal Combustion Engines as Prime Mover.
701.12(D)(3) Public Gas System, Municipal Water Supply.
701.12(D)(4) Battery Power.
701.12(D)(5) Outdoor Generator Sets. <\/td>\n<\/tr>\n
758<\/td>\n701.12(E) Uninterruptible Power Supplies.
701.12(F) Separate Service.
701.12(G) Connection Ahead of Service Disconnecting Means.
701.12(H) Fuel Cell System.
701.12(I) DC Microgrid Systems.
701.12(J) Unit Equipment.
Part IV. Overcurrent Protection 701.30 Accessibility.
701.31 Ground-Fault Protection of Equipment.
701.32 Selective Coordination. <\/td>\n<\/tr>\n
759<\/td>\nInformational Note Figure 701.32 Legally Required Standby System Selective Coordination. ARTICLE 702 Optional Standby Systems Pa
ARTICLE 702 Optional Standby Systems
702.2 Definition.
Optional Standby Systems. <\/td>\n<\/tr>\n
760<\/td>\n702.4 Capacity and Rating. 702.4(A) Available Fault Current.
702.4(B) System Capacity. 702.4(B)(1) Manual Transfer Equipment.
702.4(B)(2) Automatic Transfer Equipment.
702.5 Transfer Equipment. 702.5(A) General.
702.5(B) Meter-Mounted Transfer Switches.
702.5(C) Documentation.
702.5(D) Inadvertent Interconnection.
702.5(E) Parallel Installation.
702.6 Signals.
702.6(A) Malfunction.
702.6(B) Carrying Load.
702.7 Signs. 702.7(A) Standby.
702.7(B) Grounding. <\/td>\n<\/tr>\n
761<\/td>\n702.7(C) Power Inlet.
Part II. Wiring 702.10 Wiring Optional Standby Systems.
702.11 Portable Generator Grounding. 702.11(A) Separately Derived System.
702.11(B) Nonseparately Derived System.
702.12 Outdoor Generator Sets. 702.12(A) Portable Generators Greater Than 15 kW and Permanently Installed Generators.
702.12(B) Portable Generators 15 kW or Less.
702.12(C) Power Inlets Rated at 100 Amperes or Greater, for Portable Generators.
ARTICLE 705 Interconnected Electric Power Production Sources Part I. General 705.1 Scope.
705.2 Definitions.
Microgrid Interconnect Device (MID).
Microgrid System. <\/td>\n<\/tr>\n
762<\/td>\nPower Source Output Circuit.
705.6 Equipment Approval.
705.8 System Installation.
705.10 Identification of Power Sources.
705.11 Supply-Side Source Connections.
705.11(A) Output Rating.
705.11(B) Conductors.
705.11(C) Overcurrent Protection.
705.11(D) Connections.
705.11(E) Ground-Fault Protection.
705.12 Load-Side Source Connections.
705.12(A) Dedicated Overcurrent and Disconnect.
705.12(B) Bus or Conductor Ampere Rating.
705.12(B)(1) Feeders. <\/td>\n<\/tr>\n
763<\/td>\n705.12(B)(2) Taps.
705.12(B)(3) Busbars.
705.12(C) Marking.
705.12(D) Suitable for Backfeed.
705.12(E) Fastening.
705.13 Power Control Systems.
705.13(A) Monitoring.
705.13(B) Settings.
705.13(C) Overcurrent Protection.
705.13(D) Single Power Source Rating.
705.13(E) Access to Settings.
705.14 Output Characteristics. <\/td>\n<\/tr>\n
764<\/td>\n705.16 Interrupting and Short-Circuit Current Rating.
705.20 Disconnecting Means, Source.
705.25 Wiring Methods. 705.25(A) General.
705.25(B) Flexible Cords and Cables.
705.25(C) Multiconductor Cable Assemblies.
705.28 Circuit Sizing and Current. 705.28(A) Calculation of Maximum Circuit Current.
705.28(B) Conductor Ampacity.
705.28(C) Neutral Conductors.
705.28(C)(1) Single-Phase Line-to-Neutral Power Sources.
705.28(C)(2) Neutral Conductor Used Solely for Instrumentation, Voltage, Detection, or Phase Detection.
705.30 Overcurrent Protection. 705.30(A) Circuit and Equipment. <\/td>\n<\/tr>\n
765<\/td>\n705.30(B) Overcurrent Device Ratings.
705.30(C) Power Transformers.
705.30(D) Generators.
705.32 Ground-Fault Protection.
705.40 Loss of Primary Source.
705.45 Unbalanced Interconnections. 705.45(A) Single Phase.
705.45(B) Three Phase.
Part II. Microgrid Systems 705.50 System Operation.
705.60 Primary Power Source Connection.
705.65 Reconnection to Primary Power Source.
705.70 Microgrid Interconnect Devices (MID). <\/td>\n<\/tr>\n
766<\/td>\nARTICLE 706 Energy Storage Systems Part I. General 706.1 Scope.
706.2 Definitions.
Diversion Charge Controller.
Energy Storage System (ESS).
Flow Battery.
Inverter Utilization Output Circuit.
706.3 Qualified Personnel.
706.4 System Requirements.
706.5 Listing. <\/td>\n<\/tr>\n
767<\/td>\n706.6 Multiple Systems.
706.7 Maintenance.
706.8 Storage Batteries.
706.9 Maximum Voltage.
Part II. Disconnecting Means 706.15 Disconnecting Means. 706.15(A) ESS Disconnecting Means.
706.15(B) Remote Actuation.
706.15(C) Notification and Marking.
706.15(D) Partitions Between Components.
706.16 Connection to Energy Sources.
706.16(A) Source Disconnect. <\/td>\n<\/tr>\n
768<\/td>\n706.16(B) Identified Interactive Equipment.
706.16(C) Loss of Interactive System Power.
706.16(D) Unbalanced Interconnections.
706.16(E) Other Energy Sources.
706.16(F) Stand-Alone Operation.
Part III. Installation Requirements 706.20 General. 706.20(A) Ventilation.
706.20(B) Dwelling Units.
706.20(C) Spaces About ESS Components. 706.20(C)(1) General.
706.20(C)(2) Space Between Components.
706.21 Directory (Identification of Power Sources).
706.21(A) Facilities with Utility Services and ESS.
706.21(B) Facilities with Stand-Alone Systems.
Part IV. Circuit Requirements 706.30 Circuit Sizing and Current. 706.30(A) Maximum Rated Current for a Specific Circuit.
706.30(A)(1) Nameplate-Rated Circuit Current.
706.30(A)(2) Inverter Output Circuit Current. <\/td>\n<\/tr>\n
769<\/td>\n706.30(A)(3) Inverter Input Circuit Current.
706.30(A)(4) Inverter Utilization Output Circuit Current.
706.30(A)(5) DC to DC Converter Output Current.
706.30(B) Conductor Ampacity.
706.30(C) Ampacity of Grounded or Neutral Conductor.
706.31 Overcurrent Protection. 706.31(A) Circuits and Equipment.
706.31(B) Overcurrent Device Ampere Ratings.
706.31(C) Direct Current Rating.
706.31(D) Current Limiting.
706.31(E) Fuses.
706.31(F) Location.
706.33 Charge Control. 706.33(A) General.
706.33(B) Diversion Charge Controller. 706.33(B)(1) Sole Means of Regulating Charging.
706.33(B)(2) Circuits with Diversion Charge Controller and Diversion Load.
706.33(B)(3) ESS Using Interactive Inverters. <\/td>\n<\/tr>\n
770<\/td>\n706.33(C) Charge Controllers and DC-to-DC Converters.
Part V. Flow Battery Energy Storage Systems
706.40 General.
706.41 Electrolyte Classification.
706.42 Electrolyte Containment.
706.43 Flow Controls.
706.44 Pumps and Other Fluid Handling Equipment.
Part VI. Other Energy Storage Technologies
706.50 General.
ARTICLE 708 Critical Operations Power Systems (COPS) Part I. General 708.1 Scope. <\/td>\n<\/tr>\n
771<\/td>\n708.2 Definitions.
Commissioning.
Critical Operations Power Systems (COPS).
Designated Critical Operations Areas (DCOA).
Supervisory Control and Data Acquisition (SCADA).
708.4 Risk Assessment.
708.4(A) Conducting Risk Assessment.
708.4(B) Identification of Hazards.
708.4(C) Developing Mitigation Strategy.
708.5 Physical Security.
708.5(A) Risk Assessment.
708.5(B) Restricted Access.
708.6 Testing and Maintenance. 708.6(A) Conduct or Witness Test.
708.6(B) Tested Periodically.
708.6(C) Maintenance.
708.6(D) Written Record.
708.6(E) Testing Under Load. <\/td>\n<\/tr>\n
772<\/td>\n708.8 Commissioning. 708.8(A) Commissioning Plan.
708.8(B) Component and System Tests.
708.8(C) Baseline Test Results.
708.8(D) Functional Performance Tests.
Part II. Circuit Wiring and Equipment 708.10 Feeder and Branch Circuit Wiring. 708.10(A) Identification. 708.10(A)(1) Boxes and
708.10(A)(2) Receptacle Identification.
708.10(B) Wiring.
708.10(C) COPS Feeder Wiring Requirements.
708.10(C)(1) Protection Against Physical Damage.
708.10(C)(2) Fire Protection for Feeders. <\/td>\n<\/tr>\n
773<\/td>\n708.10(C)(3) Floodplain Protection.
708.10(D) COPS Branch Circuit Wiring.
708.11 Branch Circuit and Feeder Distribution Equipment. 708.11(A) Branch Circuit Distribution Equipment.
708.11(B) Feeder Distribution Equipment.
708.12 Feeders and Branch Circuits Supplied by COPS.
708.14 Wiring of HVAC, Fire Alarm, Security, Emergency Communications, and Signaling Systems.
Part III. Power Sources and Connection 708.20 Sources of Power. 708.20(A) General Requirements.
708.20(B) Fire Protection.
708.20(C) Grounding.
708.20(D) Surge Protection Devices.
708.20(E) Storage Battery.
708.20(F) Generator Set. 708.20(F)(1) Prime Mover-Driven. <\/td>\n<\/tr>\n
774<\/td>\n708.20(F)(2) Power for fuel transfer pumps.
708.20(F)(3) Dual Supplies.
708.20(F)(4) Battery Power and Dampers.
708.20(F)(5) Outdoor Generator Sets.
708.20(F)(6) Means for Connecting Portable or Vehicle-Mounted Generator.
708.20(F)(7) On-Site Fuel Supply.
708.20(G) Uninterruptible Power Supplies.
708.20(H) Fuel Cell System.
708.21 Ventilation.
708.22 Capacity of Power Sources. 708.22(A) Capacity and Rating.
708.22(B) Selective Load Pickup, Load Shedding, and Peak Load Shaving.
708.22(C) Duration of COPS Operation.
708.24 Transfer Equipment. 708.24(A) General.
708.24(B) Bypass Isolation Switches.
708.24(C) Automatic Transfer Switches. <\/td>\n<\/tr>\n
775<\/td>\n708.24(D) Bypass Isolation Automatic Transfer Switches.
708.24(E) Use.
708.24(F) Documentation.
708.30 Branch Circuits Supplied by COPS.
Part IV. Overcurrent Protection 708.50 Accessibility.
708.52 Ground-Fault Protection of Equipment. 708.52(A) Applicability.
708.52(B) Feeders.
708.52(C) Testing.
708.52(D) Selectivity.
708.54 Selective Coordination.
Informational Note Figure 708.54 Critical Operations Power System Selective Coordination. <\/td>\n<\/tr>\n
776<\/td>\nPart V. System Performance and Analysis 708.64 Emergency Operations Plan.
ARTICLE 710 Stand-Alone Systems 710.1 Scope.
710.6 Equipment Approval. <\/td>\n<\/tr>\n
777<\/td>\n710.10 Identification of Power Sources.
710.12 Stand-Alone Inverter Input Circuit Current.
710.15 General.
710.15(A) Supply Output.
710.15(B) Sizing and Protection.
710.15(C) Single 120-Volt Supply.
710.15(D) Three-phase Supply.
710.15(E) Energy Storage or Backup Power System Requirements.
710.15(F) Back-fed Circuit Breakers.
710.15(G) Voltage and Frequency Control.
ARTICLE 712 Direct Current Microgrids Part I. General 712.1 Scope.
712.2 Definitions.
Direct Current Microgrid (DC Microgrid).
Grounded, Functionally. <\/td>\n<\/tr>\n
778<\/td>\nGrounded Three-Wire DC System.
Grounded Two-Wire DC System
Nominal Voltage.
Primary DC Source.
Reference-Grounded DC System.
Ungrounded DC System.
712.3 Other Articles.
712.4 Listing and Labeling.
712.10 Directory. 712.10(A) Source Directory.
712.10(B) Building Directory.
Part II. Circuit Requirements 712.25 Identification of Circuit Conductors.
712.30 System Voltage.
Part III. Disconnecting Means 712.34 DC Source Disconnecting Means.
712.35 Disconnection of Ungrounded Conductors.
712.37 Directional Current Devices. <\/td>\n<\/tr>\n
779<\/td>\nPart IV. Wiring Methods 712.52 System Grounding. 712.52(A) General.
712.52(B) Over 300 Volts.
712.55 Ground Fault Detection Equipment.
712.57 Arc Fault Protection.
Part V. Marking 712.62 Distribution Equipment and Conductors.
712.65 Available DC Fault Current. 712.65(A) Field Marking.
712.65(B) Modifications.
Part VI. Protection 712.70 Overcurrent Protection.
712.72 Interrupting and Short-Circuit Current Ratings.
Part VII. Systems over 1000 Volts 712.80 General.
ARTICLE 720 Circuits and Equipment Operating at Less Than 50 Volts 720.1 Scope.
720.2 Other Articles.
720.3 Hazardous (Classified) Locations.
720.4 Conductors. <\/td>\n<\/tr>\n
780<\/td>\n720.5 Lampholders.
720.6 Receptacle Rating.
720.7 Receptacles Required.
720.9 Batteries.
720.11 Mechanical Execution of Work.
ARTICLE 725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits Part I. General 725.1 Scope.
725.2 Definitions.
Abandoned Class 2, Class 3, and PLTC Cable.
Cable Bundle.
725.3 Other Articles.
725.3(A) Number and Size of Conductors in Raceway.
725.3(B) Spread of Fire or Products of Combustion.
725.3(C) Ducts, Plenums, and Other Air-Handling Spaces.
725.3(D) Hazardous (Classified) Locations.
725.3(E) Cable Trays.
725.3(F) Motor Control Circuits.
725.3(G) Instrumentation Tray Cable.
725.3(H) Raceways Exposed to Different Temperatures. <\/td>\n<\/tr>\n
781<\/td>\n725.3(I) Vertical Support for Fire-Rated Cables and Conductors.
725.3(J) Bushing.
725.3(K) Installation of Conductors with Other Systems.
725.3(L) Corrosive, Damp, or Wet Locations.
725.3(M) Cable Routing Assemblies.
725.3(N) Communications Raceways.
725.3(O) Temperature Limitation of Class 2 and Class 3 Cables.
725.3(P) Identification of Equipment Grounding Conductors.
725.21 Access to Electrical Equipment Behind Panels Designed to Allow Access.
725.24 Mechanical Execution of Work.
725.25 Abandoned Cables.
725.30 Class 1, Class 2, and Class 3 Circuit Identification.
725.31 Safety-Control Equipment. 725.31(A) Remote-Control Circuits.
725.31(B) Physical Protection.
725.35 Class 1, Class 2, and Class 3 Circuit Requirements.
Part II. Class 1 Circuits 725.41 Class 1 Circuit Classifications and Power Source Requirements.
725.41(A) Class 1 Power-Limited Circuits. <\/td>\n<\/tr>\n
782<\/td>\n725.41(A)(1) Class 1 Transformers.
725.41(A)(2) Other Class 1 Power Sources.
725.41(B) Class 1 Remote-Control and Signaling Circuits.
725.43 Class 1 Circuit Overcurrent Protection.
725.45 Class 1 Circuit Overcurrent Device Location.
725.45(A) Point of Supply.
725.45(B) Feeder Taps.
725.45(C) Branch-Circuit Taps.
725.45(D) Primary Side of Transformer.
725.45(E) Input Side of Electronic Power Source.
725.46 Class 1 Circuit Wiring Methods.
725.48 Conductors of Different Circuits in the Same Cable, Cable Tray, Enclosure, or Raceway.
725.48(A) Two or More Class 1 Circuits.
725.48(B) Class 1 Circuits with Power-Supply Circuits. <\/td>\n<\/tr>\n
783<\/td>\n725.48(B)(1) In a Cable, Enclosure, or Raceway.
725.48(B)(2) In Factoryor Field-Assembled Control Centers.
725.48(B)(3) In a Manhole.
725.48(B)(4) In Cable Trays.
725.49 Class 1 Circuit Conductors. 725.49(A) Sizes and Use.
725.49(B) Insulation.
725.51 Number of Conductors in Cable Trays and Raceway, and Ampacity Adjustment. 725.51(A) Class 1 Circuit Conductors.
725.51(B) Power-Supply Conductors and Class 1 Circuit Conductors.
725.51(C) Class 1 Circuit Conductors in Cable Trays.
725.52 Circuits Extending Beyond One Building.
Part III. Class 2 and Class 3 Circuits 725.121 Power Sources for Class 2 and Class 3 Circuits. 725.121(A) Power Source. <\/td>\n<\/tr>\n
784<\/td>\n725.121(B) Interconnection of Power Sources.
Informational Note Figure 725.121 Class 2 and Class 3 Circuits. 725.121(C) Marking.
725.124 Circuit Marking.
725.127 Wiring Methods on Supply Side of the Class 2 or Class 3 Power Source.
725.130 Wiring Methods and Materials on Load Side of the Class 2 or Class 3 Power Source.
725.130(A) Class 1 Wiring Methods and Materials.
725.130(B) Class 2 and Class 3 Wiring Methods. <\/td>\n<\/tr>\n
785<\/td>\n725.133 Installation of Conductors and Equipment in Cables, Compartments, Cable Trays, Enclosures, Manholes, Outlet Boxes, Devic
725.135 Installation of Class 2, Class 3, and PLTC Cables.
725.135(A) Listing.
725.135(B) Ducts Specifically Fabricated for Environmental Air.
725.135(C) Other Spaces Used for Environmental Air (Plenums).
725.135(D) Risers \u2014 Cables in Vertical Runs.
725.135(E) Risers \u2014 Cables and Innerducts in Metal Raceways.
725.135(F) Risers \u2014 Cables in Fireproof Shafts. <\/td>\n<\/tr>\n
786<\/td>\n725.135(G) Risers \u2014 Oneand Two-Family Dwellings.
725.135(H) Cable Trays.
725.135(I) Cross-Connect Arrays.
725.135(J) Industrial Establishments.
725.135(K) Other Building Locations. <\/td>\n<\/tr>\n
787<\/td>\n725.135(L) Multifamily Dwellings.
725.135(M) Oneand Two-Family Dwellings.
725.136 Separation from Electric Light, Power, Class 1, Non\u2013Power-Limited Fire Alarm Circuit Conductors, and Medium-Power Networ
725.136(B) Separated by Barriers.
725.136(C) Raceways Within Enclosures.
725.136(D) Associated Systems Within Enclosures.
725.136(E) Enclosures with Single Opening.
725.136(F) Manholes. <\/td>\n<\/tr>\n
788<\/td>\n725.136(G) Cable Trays.
725.136(H) In Hoistways.
725.136(I) Other Applications.
725.139 Installation of Conductors of Different Circuits in the Same Cable, Enclosure, Cable Tray, Raceway, or Cable Routing Ass
725.139(B) Two or More Class 3 Circuits.
725.139(C) Class 2 Circuits with Class 3 Circuits.
725.139(D) Class 2 and Class 3 Circuits with Communications Circuits. 725.139(D)(1) Communications Cables.
725.139(D)(2) Composite Cables.
725.139(E) Class 2 or Class 3 Cables with Other Circuit Cables.
725.139(F) Class 2 or Class 3 Conductors or Cables and Audio System Circuits.
725.141 Installation of Circuit Conductors Extending Beyond One Building.
725.143 Support of Conductors.
725.144 Transmission of Power and Data. <\/td>\n<\/tr>\n
789<\/td>\n725.144(A) Use of Class 2 or Class 3 Cables to Transmit Power and Data.
725.144(B) Use of Class 2-LP or Class 3-LP Cables to Transmit Power and Data. <\/td>\n<\/tr>\n
790<\/td>\n725.154 Applications of Listed Class 2, Class 3, and PLTC Cables. <\/td>\n<\/tr>\n
791<\/td>\n725.154(A) Class 2 and Class 3 Cable Substitutions.
Figure 725.154(A) Cable Substitution Hierarchy. 725.154(B) Class 2, Class 3, PLTC Circuit Integrity (CI) Cable or Electrical Cir
725.154(C) Thermocouple Circuits.
Part IV. Listing Requirements 725.170 Listing and Marking of Equipment for Power and Data Transmission. <\/td>\n<\/tr>\n
792<\/td>\n725.179 Listing and Marking of Class 2, Class 3, and Type PLTC Cables.
725.179(A) Types CL2P and CL3P.
725.179(B) Types CL2R and CL3R.
725.179(C) Types CL2 and CL3.
725.179(D) Types CL2X and CL3X.
725.179(E) Type PLTC.
725.179(F) Circuit Integrity (CI) Cable or Electrical Circuit Protective System.
725.179(F)(1) Circuit Integrity (CI) Cables.
725.179(F)(2) Electrical Circuit Protective System.
725.179(G) Class 2 and Class 3 Cable Voltage and Temperature Ratings.
725.179(H) Class 3 Single Conductors. <\/td>\n<\/tr>\n
793<\/td>\n725.179(I) Limited Power (LP) Cables.
725.179(J) Marking.
725.179(K) Optional Markings.
ARTICLE 727 Instrumentation Tray Cable: Type ITC 727.1 Scope.
727.2 Definition.
Type ITC Instrumentation Tray Cable. <\/td>\n<\/tr>\n
794<\/td>\n727.3 Other Articles.
727.4 Uses Permitted.
727.5 Uses Not Permitted.
727.6 Construction.
727.7 Marking.
727.8 Ampacity.
727.9 Overcurrent Protection.
727.10 Bends.
ARTICLE 728 Fire-Resistive Cable Systems 728.1 Scope.
728.2 Definition.
Fire-Resistive Cable System. <\/td>\n<\/tr>\n
795<\/td>\n728.3 Other Articles.
728.4 General.
728.5 Installations.
728.5(A) Mounting.
728.5(B) Supports.
728.5(C) Raceways and Couplings.
728.5(D) Cable Trays.
728.5(E) Boxes.
728.5(F) Pulling Lubricants.
728.5(G) Vertical Supports.
728.5(H) Splices.
728.60 Equipment Grounding Conductor.
728.120 Marking.
ARTICLE 750 Energy Management Systems 750.1 Scope.
750.2 Definitions. Control. <\/td>\n<\/tr>\n
796<\/td>\nEnergy Management System.
Monitor.
750.20 Alternate Power Sources.
750.30 Load Management.
750.30(A) Load Shedding Controls.
750.30(B) Disconnection of Power.
750.30(C) Capacity of Branch Circuit, Feeder, or Service.
750.50 Field Markings.
ARTICLE 760 Fire Alarm Systems Part I. General 760.1 Scope.
760.2 Definitions. <\/td>\n<\/tr>\n
797<\/td>\nAbandoned Fire Alarm Cable.
Fire Alarm Circuit.
Fire Alarm Circuit Integrity (CI) Cable.
Non\u2013Power-Limited Fire Alarm Circuit (NPLFA).
Power-Limited Fire Alarm Circuit (PLFA).
760.3 Other Articles.
760.3(A) Spread of Fire or Products of Combustion.
760.3(B) Ducts, Plenums, and Other Air-Handling Spaces.
760.3(C) Hazardous (Classified) Locations.
760.3(D) Corrosive, Damp, or Wet Locations.
760.3(E) Building Control Circuits.
760.3(F) Optical Fiber Cables.
760.3(G) Installation of Conductors with Other Systems.
760.3(H) Raceways or Sleeves Exposed to Different Temperatures.
760.3(I) Vertical Support for Fire Rated Cables and Conductors.
760.3(J) Number and Size of Cables and Conductors in Raceway.
760.3(K) Bushing.
760.3(L) Cable Routing Assemblies.
760.3(M) Communications Raceways.
760.3(N) Temperature Limitations of Power-Limited and Non\u2013Power-Limited Fire Alarm Cables. <\/td>\n<\/tr>\n
798<\/td>\n760.3(O) Identification of Equipment Grounding Conductors.
760.21 Access to Electrical Equipment Behind Panels Designed to Allow Access.
760.24 Mechanical Execution of Work. 760.24(A) General.
760.24(B) Circuit Integrity (CI) Cable.
760.25 Abandoned Cables.
760.30 Fire Alarm Circuit Identification.
760.32 Fire Alarm Circuits Extending Beyond One Building.
760.35 Fire Alarm Circuit Requirements.
760.35(A) Non\u2013Power-Limited Fire Alarm (NPLFA) Circuits.
760.35(B) Power-Limited Fire Alarm (PLFA) Circuits.
Part II. Non\u2013Power-Limited Fire Alarm (NPLFA) Circuits 760.41 NPLFA Circuit Power Source Requirements. 760.41(A) Power Source.
760.41(B) Branch Circuit.
760.43 NPLFA Circuit Overcurrent Protection.
760.45 NPLFA Circuit Overcurrent Device Location. <\/td>\n<\/tr>\n
799<\/td>\n760.46 NPLFA Circuit Wiring.
760.48 Conductors of Different Circuits in Same Cable, Enclosure, or Raceway. 760.48(A) Class 1 with NPLFA Circuits.
760.48(B) Fire Alarm with Power-Supply Circuits.
760.49 NPLFA Circuit Conductors. 760.49(A) Sizes and Use.
760.49(B) Insulation.
760.49(C) Conductor Materials.
760.51 Number of Conductors in Cable Trays and Raceways, and Ampacity Adjustment Factors. 760.51(A) NPLFA Circuits and Class 1 C
760.51(B) Power-Supply Conductors and NPLFA Circuit Conductors.
760.51(C) Cable Trays.
760.53 Multiconductor NPLFA Cables.
760.53(A) NPLFA Wiring Method.
760.53(A)(1) In Raceways, Exposed on Ceilings or Sidewalls, or Fished in Concealed Spaces. <\/td>\n<\/tr>\n
800<\/td>\n760.53(A)(2) Passing Through a Floor or Wall.
760.53(A)(3) In Hoistways.
760.53(B) Applications of Listed NPLFA Cables.
760.53(B)(1) Ducts Specifically Fabricated for Environmental Air.
760.53(B)(2) Other Spaces Used for Environmental Air (Plenums).
760.53(B)(3) Riser.
760.53(B)(4) Other Wiring Within Buildings.
Part III. Power-Limited Fire Alarm (PLFA) Circuits 760.121 Power Sources for PLFA Circuits. 760.121(A) Power Source.
760.121(B) Branch Circuit.
760.124 Circuit Marking. <\/td>\n<\/tr>\n
801<\/td>\n760.127 Wiring Methods on Supply Side of the PLFA Power Source.
760.130 Wiring Methods and Materials on Load Side of the PLFA Power Source.
760.130(A) NPLFA Wiring Methods and Materials.
760.130(B) PLFA Wiring Methods and Materials.
760.130(B)(1) In Raceways, Exposed on Ceilings or Sidewalls, or Fished in Concealed Spaces.
760.130(B)(2) Passing Through a Floor or Wall.
760.130(B)(3) In Hoistways.
760.133 Installation of Conductors and Equipment in Cables, Compartments, Cable Trays, Enclosures, Manholes, Outlet Boxes, Devic
760.135 Installation of PLFA Cables in Buildings.
760.135(A) Listing.
760.135(B) Ducts Specifically Fabricated for Environmental Air.
760.135(C) Other Spaces Used For Environmental Air (Plenums). <\/td>\n<\/tr>\n
802<\/td>\n760.135(D) Risers \u2014 Cables in Vertical Runs.
760.135(E) Risers \u2014 Cables in Metal Raceways.
760.135(F) Risers \u2014 Cables in Fireproof Shafts.
760.135(G) Risers \u2014 Oneand Two-Family Dwellings.
760.135(H) Other Building Locations.
760.135(I) Nonconcealed Spaces.
760.135(J) Portable Fire Alarm System. <\/td>\n<\/tr>\n
803<\/td>\n760.136 Separation from Electric Light, Power, Class 1, NPLFA, and Medium-Power Network-Powered Broadband Communications Circuit
760.136(B) Separated by Barriers.
760.136(C) Raceways Within Enclosures.
760.136(D) Associated Systems Within Enclosures.
760.136(E) Enclosures with Single Opening.
760.136(F) In Hoistways.
760.136(G) Other Applications.
760.139 Installation of Conductors of Different PLFA Circuits, Class 2, Class 3, and Communications Circuits in the Same Cable,
760.139(B) Class 2 Circuits with PLFA Circuits.
760.139(C) Low-Power Network-Powered Broadband Communications Cables and PLFA Cables.
760.139(D) Audio System Circuits and PLFA Circuits.
760.142 Conductor Size.
760.143 Support of Conductors.
760.145 Current-Carrying Continuous Line-Type Fire Detectors. <\/td>\n<\/tr>\n
804<\/td>\n760.145(A) Application.
760.145(B) Installation.
760.154 Applications of Listed PLFA Cables. <\/td>\n<\/tr>\n
805<\/td>\n760.154(A) Fire Alarm Cable Substitutions.
Figure 760.154(A) Cable Substitution Hierarchy.
Part IV. Listing Requirements 760.176 Listing and Marking of NPLFA Cables.
760.176(A) NPLFA Conductor Materials.
760.176(B) Insulated Conductors.
760.176(C) Type NPLFP.
760.176(D) Type NPLFR. <\/td>\n<\/tr>\n
806<\/td>\n760.176(E) Type NPLF.
760.176(F) Fire Alarm Circuit Integrity (CI) Cable or Electrical Circuit Protective System.
760.176(F)(1) Circuit Integrity (CI) Cables.
760.176(F)(2) Electrical Circuit Protective System.
760.176(G) NPLFA Cable Markings.
760.179 Listing and Marking of PLFA Cables and Insulated Continuous Line-Type Fire Detectors.
760.179(A) Conductor Materials.
760.179(B) Conductor Size.
760.179(C) Voltage and Temperature Ratings.
760.179(D) Type FPLP. <\/td>\n<\/tr>\n
807<\/td>\n760.179(E) Type FPLR.
760.179(F) Type FPL.
760.179(G) Fire Alarm Circuit Integrity (CI) Cable or Electrical Circuit Protective System.
760.179(G)(1) Circuit Integrity (CI) Cables.
760.179(G)(2) Electrical Circuit Protective System.
760.179(H) Coaxial Cables.
760.179(I) Cable Marking.
760.179(J) Insulated Continuous Line-Type Fire Detectors.
ARTICLE 770 Optical Fiber Cables <\/td>\n<\/tr>\n
808<\/td>\nPart I. General 770.1 Scope.
770.2 Definitions.
Abandoned Optical Fiber Cable.
Cable Sheath.
Exposed (to Accidental Contact).
Point of Entrance.
770.3 Other Articles.
770.3(A) Hazardous (Classified) Locations.
770.3(B) Cables in Ducts for Dust, Loose Stock, or Vapor Removal.
770.3(C) Composite Cables.
770.21 Access to Electrical Equipment Behind Panels Designed to Allow Access.
770.24 Mechanical Execution of Work.
770.25 Abandoned Cables.
770.26 Spread of Fire or Products of Combustion.
Part II. Cables Outside and Entering Buildings 770.44 Overhead (Aerial) Optical Fiber Cables.
770.44(A) On Poles and In-Span. <\/td>\n<\/tr>\n
809<\/td>\n770.44(A)(1) Relative Location.
770.44(A)(2) Attachment to Cross-Arms.
770.44(A)(3) Climbing Space.
770.44(A)(4) Clearance.
770.44(B) Above Roofs.
770.47 Underground Optical Fiber Cables Entering Buildings.
770.47(A) Underground Systems with Electric Light, Power, Class 1, or Non\u2013Power-Limited Fire Alarm Circuit Conductors.
770.47(B) Direct-Buried Cables and Raceways.
770.48 Unlisted Cables Entering Buildings. 770.48(A) Conductive and Nonconductive Cables.
770.48(B) Nonconductive Cables in Raceway.
770.49 Metal Entrance Conduit Grounding.
Part III. Protection <\/td>\n<\/tr>\n
810<\/td>\n770.93 Grounding, Bonding, or Interruption of Non\u2013Current-Carrying Metallic Members of Optical Fiber Cables.
770.93(A) Entering Buildings.
770.93(B) Terminating on the Outside of Buildings.
Part IV. Grounding Methods 770.100 Entrance Cable Bonding and Grounding.
770.100(A) Bonding Conductor or Grounding Electrode Conductor. 770.100(A)(1) Insulation.
770.100(A)(2) Material.
770.100(A)(3) Size.
770.100(A)(4) Length.
770.100(A)(5) Run in Straight Line.
770.100(A)(6) Physical Protection.
770.100(B) Electrode.
770.100(B)(1) In Buildings or Structures with an Intersystem Bonding Termination.
770.100(B)(2) In Buildings or Structures with Grounding Means. <\/td>\n<\/tr>\n
811<\/td>\n770.100(B)(3) In Buildings or Structures Without Intersystem Bonding Termination or Grounding Means.
770.100(C) Electrode Connection.
770.100(D) Bonding of Electrodes.
770.106 Grounding and Bonding of Entrance Cables at Mobile Homes. 770.106(A) Grounding.
770.106(B) Bonding.
Part V. Installation Methods Within Buildings 770.110 Raceways, Cable Routing Assemblies, and Cable Trays for Optical Fiber Cabl
770.110(A)(1) Raceways Recognized in Chapter 3.
770.110(A)(2) Communications Raceways.
770.110(A)(3) Innerduct for Optical Fiber Cables.
770.110(B) Raceway Fill for Optical Fiber Cables.
770.110(B)(1) Without Electric Light or Power Conductors.
770.110(B)(2) Nonconductive Optical Fiber Cables with Electric Light or Power Conductors.
770.110(C) Cable Routing Assemblies.
770.110(D) Cable Trays. <\/td>\n<\/tr>\n
812<\/td>\n770.113 Installation of Optical Fiber Cables.
770.113(A) Listing.
770.113(B) Ducts Specifically Fabricated for Environmental Air.
770.113(C) Other Spaces Used for Environmental Air (Plenums).
770.113(D) Risers \u2014 Cables in Vertical Runs.
770.113(E) Risers \u2014 Cables and Innerducts in Metal Raceways.
770.113(F) Risers \u2014 Cables in Fireproof Shafts. <\/td>\n<\/tr>\n
813<\/td>\n770.113(G) Risers \u2014 Oneand Two-Family Dwellings.
770.113(H) Cable Trays.
770.113(I) Distributing Frames and Cross-Connect Arrays.
770.113(J) Other Building Locations.
770.114 Grounding.
770.133 Installation of Optical Fibers and Electrical Conductors. 770.133(A) In Cable Trays and Raceways.
770.133(B) In Cabinets, Outlet Boxes, and Similar Enclosures. <\/td>\n<\/tr>\n
814<\/td>\n770.133(C) With Other Circuits.
770.133(D) Support of Optical Fiber Cables.
770.154 Applications of Listed Optical Fiber Cables. <\/td>\n<\/tr>\n
815<\/td>\nFigure 770.154 Cable Substitution Hierarchy. Part VI. Listing Requirements 770.179 Optical Fiber Cables.
770.179(A) Types OFNP and OFCP. <\/td>\n<\/tr>\n
816<\/td>\n770.179(B) Types OFNR and OFCR.
770.179(C) Types OFNG and OFCG.
770.179(D) Types OFN and OFC.
770.179(E) Circuit Integrity (CI) Cable or Electrical Circuit Protective System.
770.179(E)(1) Circuit Integrity (CI) Cables.
770.179(E)(2) Fire-Resistive Cables.
770.179(F) Field-Assembled Optical Fiber Cables. <\/td>\n<\/tr>\n
817<\/td>\n770.179(G) Optional Markings.
770.180 Grounding Devices.
Chapter 8 Communications Systems
ARTICLE 800 General Requirements for Communications Systems Part I. General 800.1 Scope.
800.2 Definitions.
Abandoned Cable.
Block.
Cable Sheath.
Communications Circuit.
Communications Service Provider.
Exposed (to Accidental Contact).
Point of Entrance.
Premises.
800.3 Other Articles. <\/td>\n<\/tr>\n
818<\/td>\n800.3(A) Hazardous (Classified) Locations.
800.3(B) Wiring in Ducts for Dust, Loose Stock, or Vapor Removal.
800.3(C) Equipment in Other Space Used for Environmental Air.
800.3(D) Installation and Use.
800.3(E) Optical Fiber Cable.
800.3(F) Other Communications Systems.
800.3(G) Reconditioned Equipment.
800.21 Access to Electrical Equipment Behind Panels Designed to Allow Access.
800.24 Mechanical Execution of Work.
800.25 Abandoned Cables.
800.26 Spread of Fire or Products of Combustion.
800.27 Temperature Limitation of Wires and Cables.
Part II. Wires and Cables Outside and Entering Buildings 800.44 Overhead (Aerial) Wires and Cables.
800.44(A) On Poles and In-Span. <\/td>\n<\/tr>\n
819<\/td>\n800.44(A)(1) Relative Location.
800.44(A)(2) Attachment to Cross-Arms.
800.44(A)(3) Climbing Space.
800.44(A)(4) Clearance.
800.44(B) Above Roofs.
800.44(C) On Masts.
800.44(D) Between Buildings.
800.49 Metal Entrance Conduit Grounding.
800.53 Separation from Lightning Conductors.
Part III. Grounding Methods 800.100 Cable and Primary Protector Bonding and Grounding. 800.100(A) Bonding Conductor or Grounding
800.100(A)(2) Material.
800.100(A)(3) Size.
800.100(A)(4) Length. <\/td>\n<\/tr>\n
820<\/td>\n800.100(A)(5) Run in Straight Line.
800.100(A)(6) Physical Protection.
800.100(B) Electrode.
800.100(B)(1) In Buildings or Structures with an Intersystem Bonding Termination.
Informational Note Figure 800.100(B)(1) Illustration of a Bonding Conductor in a Communications Installation. 800.100(B)(2) In B
Informational Note Figure 800.100(B)(2) Illustration of a Bonding Conductor in a Communications Installation. <\/td>\n<\/tr>\n
821<\/td>\n800.100(B)(3) In Buildings or Structures Without an Intersystem Bonding Termination or Grounding Means.
800.100(C) Electrode Connection.
800.100(D) Bonding of Electrodes.
800.106 Primary Protector Grounding and Bonding at Mobile Homes. 800.106(A) Grounding.
800.106(A)(1) Mobile Home Service Equipment.
800.106(A)(2) Mobile Home Feeder Disconnecting Means.
800.106(B) Bonding. <\/td>\n<\/tr>\n
822<\/td>\nPart IV. Installation Methods Within Buildings 800.110 Raceways, Cable Routing Assemblies, and Cable Trays. 800.110(A) Types of
800.110(A)(1) Raceways Recognized in Chapter 3.
800.110(A)(2) Communications Raceways.
800.110(A)(3) Innerduct for Communications Wires and Cables, Coaxial Cables, or Network-Powered Broadband Communications Cables.
800.110(B) Raceway Fill.
800.110(C) Cable Routing Assemblies.
800.110(C)(1) Horizontal Support.
800.110(C)(2) Vertical Support.
800.110(D) Cable Trays.
800.113 Installation of Wires, Cables, Cable Routing Assemblies, and Communications Raceways.
800.113(A) Listing.
800.113(B) Ducts Specifically Fabricated for Environmental Air.
800.113(C) Other Spaces Used for Environmental Air (Plenums). <\/td>\n<\/tr>\n
823<\/td>\n800.113(D) Risers \u2014 Cables, Cable Routing Assemblies, and Communications Raceways in Vertical Runs.
800.113(E) Risers \u2014 Cables and Innerducts in Metal Raceways.
800.113(F) Risers \u2014 Cables, Cable Routing Assemblies, and Communications Raceways in Fireproof Shafts.
800.113(G) Risers \u2014 Oneand Two-Family Dwellings.
800.113(H) Cable Trays. <\/td>\n<\/tr>\n
824<\/td>\n800.113(I) Distributing Frames and Cross-Connect Arrays.
800.113(J) Other Building Locations.
800.113(K) Multifamily Dwellings.
800.113(L) Oneand Two-Family Dwellings. <\/td>\n<\/tr>\n
825<\/td>\n800.154 Applications of Listed Communications Wires, Cables, and Raceways, and Listed Cable Routing Assemblies. <\/td>\n<\/tr>\n
828<\/td>\n800.179 Plenum, Riser, General-Purpose, and Limited Use Cables.
800.179(A) Plenum Cables.
800.179(B) Riser Cables.
800.179(C) General-Purpose Cables.
800.179(D) Limited-Use Cables.
Part V. Listing Requirements 800.180 Grounding Devices. <\/td>\n<\/tr>\n
829<\/td>\n800.182 Cable Routing Assemblies and Communications Raceways.
800.182(A) Plenum Cable Routing Assemblies and Plenum Communications Raceways.
800.182(B) Riser Cable Routing Assemblies and Riser Communications Raceways.
800.182(C) General-Purpose Cable Routing Assemblies and General-Purpose Communications Raceways.
ARTICLE 805 Communications Circuits Part I. General 805.1 Scope.
805.2 Definitions.
Cable. <\/td>\n<\/tr>\n
830<\/td>\nCommunications Circuit Integrity (CI) Cable.
Wire.
805.18 Installation of Equipment.
Part II. Wires and Cables Outside and Entering Buildings 805.47 Underground Communications Wires and Cables Entering Buildings.
805.47(A) Underground Systems with Electric Light, Power, Class 1, or Non-Power-Limited Fire Alarm Circuit Conductors.
805.47(B) Underground Block Distribution.
805.48 Unlisted Cables Entering Buildings.
805.50 Circuits Requiring Primary Protectors.
805.50(A) Insulation, Wires, and Cables.
805.50(B) On Buildings.
805.50(C) Entering Buildings.
Part III. Protection 805.90 Protective Devices. 805.90(A) Application. <\/td>\n<\/tr>\n
831<\/td>\n805.90(A)(1) Fuseless Primary Protectors.
805.90(A)(2) Fused Primary Protectors.
805.90(B) Location.
805.90(C) Hazardous (Classified) Locations.
805.90(D) Secondary Protectors.
805.93 Grounding, Bonding, or Interruption of Non\u2013Current-Carrying Metallic Sheath Members of Communications Cables.
805.93(A) Entering Buildings.
805.93(B) Terminating on the Outside of Buildings.
Part IV. Installation Methods Within Buildings 805.133 Installation of Communications Wires, Cables, and Equipment. <\/td>\n<\/tr>\n
832<\/td>\n805.133(A) Separation from Other Conductors. 805.133(A)(1) In Raceways, Cable Trays, Boxes, Cables, Enclosures, and Cable Routin
805.133(A)(2) Other Applications.
805.133(B) Support of Communications Wires and Cables.
805.154 Substitutions of Listed Communications Wires, Cables, and Raceways, and Listed Cable Routing Assemblies.
Figure 805.154 Cable Substitution Hierarchy. <\/td>\n<\/tr>\n
833<\/td>\n805.156 Dwelling Unit Communications Outlet.
Part V. Listing Requirements 805.170 Equipment.
805.170(A) Primary Protectors.
805.170(B) Secondary Protectors.
805.170(C) Plenum Grade Cable Ties.
805.173 Drop Wire and Cable.
805.179 Communications Wires and Cables. <\/td>\n<\/tr>\n
834<\/td>\n805.179(A) General Requirements.
805.179(B) Type CMUC Undercarpet Wires and Cables.
805.179(C) Circuit Integrity (CI) Cable or Electrical Circuit Protective System.
805.179(C)(1) Circuit Integrity (CI) Cables.
805.179(C)(2) Fire-Resistive Cables.
805.179(D) Types CMP-LP, CMR-LP, CMG-LP, and CM-LP Limited Power (LP) Cables.
805.179(E) Communications Wires.
805.179(F) Hybrid Power and Communications Cables. <\/td>\n<\/tr>\n
835<\/td>\n805.179(G) Optional Markings.
ARTICLE 810 Radio and Television Equipment Part I. General 810.1 Scope.
810.2 Definitions.
810.3 Other Articles.
810.4 Community Television Antenna.
810.5 Radio Noise Suppressors.
810.6 Antenna Lead-In Protectors.
810.7 Grounding Devices.
Part II. Receiving Equipment \u2014 Antenna Systems 810.11 Material.
810.12 Supports.
810.13 Avoidance of Contacts with Conductors of Other Systems.
810.14 Splices.
810.15 Grounding.
810.16 Size of Wire-Strung Antenna \u2014 Receiving Station. <\/td>\n<\/tr>\n
836<\/td>\n810.16(A) Size of Antenna Conductors.
810.16(B) Self-Supporting Antennas.
810.17 Size of Lead-in \u2014 Receiving Station.
810.18 Clearances \u2014 Receiving Stations. 810.18(A) Outside of Buildings.
810.18(B) Antennas and Lead-ins \u2014 Indoors.
810.18(C) In Boxes or Other Enclosures.
810.19 Electrical Supply Circuits Used in Lieu of Antenna \u2014 Receiving Stations.
810.20 Antenna Discharge Units \u2014 Receiving Stations. 810.20(A) Where Required.
810.20(B) Location.
810.20(C) Grounding. <\/td>\n<\/tr>\n
837<\/td>\n810.21 Bonding Conductors and Grounding Electrode Conductors \u2014 Receiving Stations.
810.21(A) Material.
810.21(B) Insulation.
810.21(C) Supports.
810.21(D) Physical Protection.
810.21(E) Run in Straight Line.
810.21(F) Electrode.
810.21(F)(1) In Buildings or Structures with an Intersystem Bonding Termination.
810.21(F)(2) In Buildings or Structures with Grounding Means.
810.21(F)(3) In Buildings or Structures Without an Intersystem Bonding Termination or Grounding Means.
810.21(G) Inside or Outside Building.
810.21(H) Size.
810.21(I) Common Ground.
810.21(J) Bonding of Electrodes.
810.21(K) Electrode Connection.
Part III. Amateur and Citizen Band Transmitting and Receiving Stations \u2014 Antenna Systems 810.51 Other Sections. <\/td>\n<\/tr>\n
838<\/td>\n810.52 Size of Antenna.
810.53 Size of Lead-in Conductors.
810.54 Clearance on Building.
810.55 Entrance to Building.
810.56 Protection Against Accidental Contact.
810.57 Antenna Discharge Units \u2014 Transmitting Stations.
810.58 Bonding Conductors and Grounding Electrode Conductors \u2014 Amateur and Citizen Band Transmitting and Receiving Stations.
810.58(A) Other Sections.
810.58(B) Size of Protective Bonding Conductor or Grounding Electrode Conductor.
810.58(C) Size of Operating Bonding Conductor or Grounding Electrode Conductor.
Part IV. Interior Installation \u2014 Transmitting Stations 810.70 Clearance from Other Conductors.
810.71 General.
810.71(A) Enclosing. <\/td>\n<\/tr>\n
839<\/td>\n810.71(B) Grounding of Controls.
810.71(C) Interlocks on Doors.
ARTICLE 820 Community Antenna Television and Radio Distribution Systems Part I. General 820.1 Scope.
820.2 Definitions.
820.3 Other Articles.
820.3(A) General Requirements.
820.3(B) Alternate Wiring Methods.
820.15 Power Limitations.
Part II. Coaxial Cables Outside and Entering Buildings 820.44 Overhead (Aerial) Coaxial Cables.
820.44(A) On Poles and In-Span, Above Roofs, on Masts, or Between Buildings.
820.44(B) On Buildings.
820.44(B)(1) Electric Light or Power.
820.44(B)(2) Other Communications Systems.
820.47 Underground Coaxial Cables Entering Buildings.
820.47(A) Underground Systems with Electric Light, Power, Class 1, or Non\u2013Power-Limited Fire Alarm Circuit Conductors.
820.47(B) Direct-Buried Cables and Raceways. <\/td>\n<\/tr>\n
840<\/td>\n820.48 Unlisted Cables Entering Buildings.
Part III. Protection 820.93 Grounding of the Outer Conductive Shield of Coaxial Cables.
820.93(A) Entering Buildings.
820.93(B) Terminating Outside of the Building.
820.93(C) Location.
820.93(D) Hazardous (Classified) Locations.
Part IV. Grounding Methods 820.100 Cable Bonding and Grounding.
820.100(A) General Requirements.
820.100(B) Shield Protection Devices.
820.103 Equipment Grounding.
Part V. Installation Methods Within Buildings 820.133 Installation of Coaxial Cables and Equipment.
820.133(A) Separation from Other Conductors. 820.133(A)(1) In Raceways, Cable Trays, Boxes, Enclosures, and Cable Routing Assemb <\/td>\n<\/tr>\n
841<\/td>\n820.133(A)(2) Other Applications.
820.133(B) Support of Coaxial Cables.
820.154 Substitutions of Listed CATV Cables.
Figure 820.154 Cable Substitution Hierarchy. <\/td>\n<\/tr>\n
842<\/td>\nPart VI. Listing Requirements 820.179 Coaxial Cables.
820.179(A) General Requirements.
820.179(B) Optional Markings.
ARTICLE 830 Network-Powered Broadband Communications Systems Part I. General 830.1 Scope. <\/td>\n<\/tr>\n
843<\/td>\n830.2 Definitions.
Fault Protection Device.
Network Interface Unit (NIU).
Network-Powered Broadband Communications Circuit.
830.3 Other Articles.
830.3(A) General Requirements.
830.3(B) Output Circuits.
830.3(C) Protection Against Physical Damage.
830.15 Power Limitations. <\/td>\n<\/tr>\n
844<\/td>\n830.24 Mechanical Execution of Work.
Part II. Cables Outside and Entering Buildings 830.40 Entrance Cables.
830.40(A) Medium-Power Circuits.
830.40(B) Low-Power Circuits.
830.44 Overhead (Aerial) Cables.
830.44(A) On Poles and In-Span or Above Roofs.
830.44(B) Clearance from Ground.
830.44(C) Over Pools.
830.44(D) Final Spans.
830.44(E) Between Buildings. <\/td>\n<\/tr>\n
845<\/td>\n830.44(F) On Buildings.
830.44(F)(1) Electric Light or Power.
830.44(F)(2) Other Communications Systems.
830.44(F)(3) Protection from Damage.
830.47 Underground Network-Powered Broadband Communications Cables Entering Buildings.
830.47(A) Underground Systems with Electric Light and Power, Class 1, or Non\u2013Power-Limited Fire Alarm Circuit Conductors.
830.47(B) Direct-Buried Cables and Raceways.
830.47(C) Protection from Physical Damage. <\/td>\n<\/tr>\n
846<\/td>\n830.47(D) Pools.
Part III. Protection 830.90 Primary Electrical Protection. 830.90(A) Application.
830.90(A)(1) Fuseless Primary Protectors.
830.90(A)(2) Fused Primary Protectors.
830.90(B) Location.
830.90(C) Hazardous (Classified) Locations.
Part IV. Grounding Methods 830.93 Grounding or Interruption of Metallic Members of Network-Powered Broadband Communications Cabl <\/td>\n<\/tr>\n
847<\/td>\n830.93(A) Entering Buildings.
830.93(B) Terminating Outside of the Building.
Part V. Installation Methods Within Buildings 830.133 Installation of Network-Powered Broadband Communications Cables and Equipm
830.133(A) Separation of Conductors. 830.133(A)(1) In Raceways, Cable Trays, Boxes, Enclosures, and Cable Routing Assemblies.
830.133(A)(2) Other Applications.
830.133(B) Support of Network-Powered Broadband Communications Cables.
830.154 Substitutions of Network-Powered Broadband Communications System Cables. <\/td>\n<\/tr>\n
848<\/td>\n830.160 Bends.
Part VI. Listing Requirements 830.179 Network-Powered Broadband Communications Equipment and Cables.
830.179(A) General Requirements.
830.179(B) Network-Powered Broadband Communications Medium-Power Cables.
830.179(C) Network-Powered Broadband Communication Low-Power Cables.
830.179(D) Optional Markings.
ARTICLE 840 Premises-Powered Broadband Communications Systems Part I. General 840.1 Scope.
840.2 Definitions.
Broadband.
Network Terminal.
Premises Communications Circuit.
Premises Community Antenna Television (CATV) Circuit. <\/td>\n<\/tr>\n
849<\/td>\nPremises-Powered.
840.3 Other Articles.
840.3(A) General Requirements.
840.3(B) Output Circuits.
840.3(C) Electrical Classification of Data Circuits and Cables.
840.24 Mechanical Execution of Work.
840.25 Abandoned Cables.
840.26 Spread of Fire or Products of Combustion.
Part II. Cables Outside and Entering Buildings 840.47 Underground Wires and Cables Entering Buildings.
840.47(A) Optical Fiber Cables. 840.47(A)(1) Class 1 or Non\u2013Power-Limited Fire Alarm Circuits.
840.47(A)(2) Direct-Buried Cables.
840.47(A)(3) Mechanical Protection.
840.47(B) Communications Wires and Cables.
840.47(C) Coaxial Cables.
840.48 Unlisted Wires and Cables Entering Buildings.
840.48(A) Optical Fiber Cables. <\/td>\n<\/tr>\n
850<\/td>\n840.48(B) Communications Wires and Cables.
840.48(C) Coaxial Cables.
Part III. Protection 840.90 Protective Devices.
840.93 Grounding or Interruption.
840.93(A) Non\u2013Current-Carrying Metallic Members of Optical Fiber Cables.
840.93(B) Communications Cables.
840.93(C) Coaxial Cables.
840.94 Premises Circuits Leaving the Building.
Part IV. Grounding Methods 840.101 Premises Circuits Not Leaving the Building.
840.101(A) Coaxial Cable Shield Grounding.
840.101(B) Communications Circuit Grounding.
840.101(C) Network Terminal Grounding.
840.102 Premises Circuits Leaving the Building.
Part V. Installation Methods Within Buildings 840.133 Installation of Optical Fibers and Electrical Conductors.
Part VI. Premises Powering of Communications Equipment over Communications Cables 840.160 Powering Circuits. <\/td>\n<\/tr>\n
851<\/td>\nPart VII. Listing Requirements 840.170 Equipment and Cables.
840.170(A) Network Terminal.
840.170(B) Optical Fiber Cables.
840.170(C) Communications Equipment.
840.170(D) Cable Routing Assemblies and Communications Raceways.
840.170(E) Premises Communications Wires and Cables.
840.170(F) Premises Community Antenna Television (CATV) Circuits.
840.170(G) Power Source.
840.170(H) Accessory Equipment.
Chapter 9 Tables <\/td>\n<\/tr>\n
870<\/td>\nA Product Safety Standards <\/td>\n<\/tr>\n
879<\/td>\nB Application Information for Ampacity Calculation
B.1 Equation Application Information.
B.2 Typical Applications Covered by Tables. <\/td>\n<\/tr>\n
880<\/td>\nB.3 Criteria Modifications.
B.4 Electrical Ducts.
B.5 Table B.2(6) and Table B.2(7).
B.6 Electrical Ducts Used in Figure B.2(1).
B.7 Examples Showing Use of Figure B.3 for Electrical Duct Bank Ampacity Modifications. <\/td>\n<\/tr>\n
888<\/td>\nFigure B.2(1) Cable Installation Dimensions for Use with Table B.2(5) Through Table B.2(10). <\/td>\n<\/tr>\n
889<\/td>\nFigure B.2(2) Ampacities of Single Insulated Conductors Rated 0 Through 5000 Volts in Underground Electrical Ducts (Three Conduc <\/td>\n<\/tr>\n
890<\/td>\nFigure B.2(3) Ampacities of Single Insulated Conductors Rated 0 Through 5000 Volts in Nonmagnetic Underground Electrical Ducts ( <\/td>\n<\/tr>\n
892<\/td>\nFigure B.2(4) Ampacities of Single Insulated Conductors Rated 0 Through 5000 Volts in Nonmagnetic Underground Electrical Ducts ( <\/td>\n<\/tr>\n
893<\/td>\nC Conduit, Tubing, and Cable Tray Fill Tables for Conductors and Fixture Wires of the Same Size
D Examples <\/td>\n<\/tr>\n
918<\/td>\nE Types of Construction <\/td>\n<\/tr>\n
920<\/td>\nF Availability and Reliability for Critical Operations Power Systems; and Development and Implementation of Functional Performan <\/td>\n<\/tr>\n
922<\/td>\nG Supervisory Control and Data Acquisition (SCADA) <\/td>\n<\/tr>\n
923<\/td>\nH Administration and Enforcement <\/td>\n<\/tr>\n
929<\/td>\nI Recommended Tightening Torque Tables from UL Standard 486A-486B <\/td>\n<\/tr>\n
930<\/td>\nJ ADA Standards for Accessible Design <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

NFPA 70, National Electrical Code (NEC)<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
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