The California Electrical Code (CEC) contains electrical design and construction standards. Provisions contained in the CEC provide minimum standards to safeguard life or limb, health, property, and public welfare, and to protect against hazards that may arise from the use of electricity by regulating and controlling the design, construction, installation quality of materials, and the location and operation of electrical equipment, wiring, and systems. The CEC is a fully integrated code based on the 2014 National Electrical Code®.

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PDF Pages	PDF Title
1	California Electrical Code 2016
3	Copyright
4	Preface
5	Acknowledgements
6	California Code of Regulations, Title 24
8	How to Distinguish Between Model Code Language and California Amendments
10	CONTENTS
16	California Matrix Adoption Tables
20	CALIFORNIA ARTICLE 89: General Code Provisions SECTION 89.101 GENERAL 89.101.1 Title 89.101.2 Purpose 89.101.3 Scope 89.101.3.1 Nonstate-Regulated Buildings, Structures, and Applications 89.101.3.2 State-Regulated Buildings, Structures, and Applications
21	89.101.3.3 Exempted from this Code
22	89.101.4 Annexes 89.101.5 Referenced Codes 89.101.6 Non-Building Standards, Orders and Regulations 89.101.7 Order of Precedence and Use 89.101.7.1 Differences 89.101.7.2 Specific Provisions 89.101.7.3 Conflicts 89.101.8 City, County, or City and County Amendments, Additions or Deletions 89.101.8.1 Findings and Filings 89.101.8.2 Locally adopted energy standards _California Energy Code, Part 6 89.101.9 Effective Date of this Code
23	89.101.10 Availability of Codes 89.101.11 Format 89.101.12 Validity SECTION 89.102 BUILDING STANDARDS COMMISSION 89.102.1 89.102.1.1 State building 89.102.1.2 Enforcement 89.102.1.3 Enforcement, Reserved for DGS 89.102.1.4 Adopting agency identification 89.102.2 BSC-CG
24	89.102.3 Alternative Materials, Design And Methods Of Construction And Equipment. 89.102.3.1 Research Reports 89.102.3.2 Tests SECTION 89.103 RESERVED FOR BOARD OF STATE AND COMMUNITY CORRECTIONS SECTION 89.104 RESERVED FOR THE DEPARTMENT OF CONSUMER AFFAIRS SECTION 89.105 RESERVED FOR THE CALIFORNIA ENERGY COMMISSION SECTION 89.106 RESERVED FOR THE DEPARTMENT OF FOOD AND AGRIGULTURE SECTION 89.107 CALIFORNIA DEPARTMENT OF PUBLIC HEALTH SECTION 89.108 DEPARTMENT OF HOUSING AND COMMUNITY DEVELOPMENT 89.108.1 Purpose 89.108.2 AUTHORITY AND ABBREVIATIONS 89.108.2.1 General 89.108.2.1.1 Housing Construction
25	89.108.2.1.2 Housing Accessibility 89.108.2.1.3 Permanent Buildings in Mobilehome Parks and Special Occupancy Parks
26	89.108.3 LOCAL ENFORCING AGENCY 89.108.3.1 Duties and Powers 89.108.3.2 Laws, Rules, and Regulations 89.108.3.2.1 State Housing Law 89.108.3.2.2 Mobilehome Parks Act 89.108.3.2.3 Special Occupancy Parks Act 89.108.3.2.4 Employee Housing Act 89.108.3.2.5 Factory-Built Housing Law 89.108.4 PERMITS, FEES, APPLICATIONS AND INSPECTIONS 89.108.4.1 Permits
27	89.108.4.2 Fees 89.108.4.3 Plan Review and Time Limitations 89.108.4.3.1 Retention of Plans 89.108.4.4 Inspections 89.108.5 RIGHT OF ENTRY FOR ENFORCEMENT 89.108.5.1 General
28	89.108.6 LOCAL MODIFICATION BY ORDINANCE OR REGULATION 89.108.6.1 General 89.108.6.2 Findings, Filings, and Rejections of Local Modifications 89.108.7 ALTERNATE MATERIALS, DESIGNS, TESTS AND METHODS OF CONSTRUCTION 89.108.7.1 General 89.108.7.2 Local Building Departments 89.108.7.2.1 Approval of Alternates
29	89.108.7.3 Department of Housing and Community Development 89.108.8 APPEALS BOARD 89.108.8.1 General 89.108.8.2 Definitions 89.108.8.3 Appeals 89.108.9 UNSAFE BUILDINGS OR STRUCTURES 89.108.9.1 Authority to Enforce
30	89.108.9.2 Actions and Proceedings 89.108.10 OTHER BUILDING REGULATIONS 89.108.10.1 Existing Structures 89.108.10.2 Moved Structures SECTION 89.109 DIVISION OF THE STATE ARCHITECT 89.109.1 DSA-AC – Division of the State Architect-Access Compliance 89.109.2 DSA-SS — Division of the State Architect – Structural Safety 89.109.2.1. DSA-SS (Division of the State Architect – Structural Safety) 89.109.2.2. DSA-SS/CC (Division of the State Architect – Structural Safety/Community Colleges)
31	89.109.3 SHB – State Historical Building Safety Board SECTION 89.110 OFFICE OF STATEWIDE HEALTH PLANNING AND DEVELOPMENT 89.110.1. OSHPD 1 89.110.1.1 Applicable administrative standards 89.110.1.2 Applicable building standards 89.110.2. OSHPD 2 89.110.2.1 Applicable administrative standards 89.110.2.2 Applicable building standards 89.110.3. OSHPD 3 89.110.3.1 Applicable administrative standards 89.110.3.2 Applicable building standards 89.110.4. OSHPD 4 89.110.4.1 Applicable administrative standards
32	89.110.4.2 Applicable building standards SECTION 89.111 OFFICE OF THE STATE FIRE MARSHAL 89.111.1 SFM—Office of the State Fire Marshal
33	89.111.2 Duties and Powers of the Enforcing Agency 89.111.2.1 Enforcement 89.111.2.1.1 89.111.2.1.2
34	89.111.2.1.3 89.111.2.2 Right of entry 89.111.2.3 More Restrictive Fire and Panic Safety Building Standards 89.111.2.3.1 89.111.2.3.2 89.111.2.3.3 89.111.2.4 Request for alternate means of protection
35	89.111.2.5 Appeals 89.111.3 Construction Documents 89.111.3.1 Public schools 89.111.3.2 Movable walls and partitions 89.111.3.3 New construction high-rise buildings 89.111.3.4 Existing high-rise buildings 89.111.3.5 Retention of Plans 89.111.4 Fees 89.111.4.1 Other fees 89.111.4.2 Large Family Day Care 89.111.4.3 High-Rise
36	89.111.4.4 Fire Clearance Preinspection 89.111.4.5 Care Facilities 89.111.4.6 Requests of the Office of the State Fire Marshal Requests 89.111.5 Inspections 89.111.5.1 Existing Group I-1 or R occupancies 89.111.6 Certificate of Occupancy 89.111.7 Temporary Structures and Uses 89.111.8 Service Utilities 89.111.9 Stop Work Order 89.111.10 Unsafe Buildings, Structures and Equipment SECTION 89.112 RESERVED FOR THE STATE LIBRARIAN SECTION 89.113 RESERVED FOR THE DEPARTMENT OF WATER RESOURCES SECTION 89.114 RESERVED FOR THE CALIFORNIA STATE LANDS COMMISSION
37	ARTICLE 90 – CALIFORNIA MATRIX ADOPTION TABLE
40	NFPA 70® National Electrical Code® 2014 Edition
42	ARTICLE 90 Introduction 90.1 Purpose 90.2 Scope
43	90.3 Code Arrangement 90.4 Enforcement 90.5 Mandatory Rules, Permissive Rules, and Explanatory Material
44	90.6 Formal Interpretations 90.7 Examination of Equipment for Safety 90.8 Wiring Planning 90.9 Units of Measurement
48	Chapter 1 General ARTICLE 100 Definitions I. General
56	II. Over 600 Volts, Nominal
57	ARTICLE 110 Requirements for Electrical Installations I. General 110.1 Scope 110.2 Approval 110.3 Examination, Identification, Installation, and Use of Equipment
58	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 110.13 Mounting and Cooling of Equipment
59	110.14 Electrical Connections
60	110.15 High-Leg Marking 110.16 Arc-Flash Hazard Warning 110.18 Arcing Parts 110.19 Light and Power from Railway Conductors 110.21 Marking 110.22 Identification of Disconnecting Means 110.23 Current Transformers
61	110.24 Available Fault Current 110.25 Lockable Disconnecting Means II. 600 Volts, Nominal, or Less 110.26 Spaces About Electrical Equipment
63	110.27 Guarding of Live Parts 110.28 Enclosure Types III. Over 600 Volts, Nominal 110.30 General 110.31 Enclosure for Electrical Installations
65	110.32 Work Space About Equipment 110.33 Entrance to Enclosures and Access to Working Space
66	110.34 Work Space and Guarding
67	110.36 Circuit Conductors 110.40 Temperature Limitations at Terminations IV. Tunnel Installations over 600 Volts, Nominal 110.51 General 110.52 Overcurrent Protection 110.53 Conductors 110.54 Bonding and 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
68	V. Manholes and Other Electrical Enclosures Intended for Personnel Entry, All Voltages 110.70 General 110.71 Strength 110.72 Cabling Work Space 110.73 Equipment Work Space 110.74 Conductor Installation 110.75 Access to Manholes
69	110.76 Access to Vaults and Tunnels 110.77 Ventilation 110.78 Guarding 110.79 Fixed Ladders
74	Chapter 2 Wiring and Protection ARTICLE 200 Use and Identification of Grounded Conductors 200.1 Scope 200.2 General 200.3 Connection to Grounded System 200.4 Neutral Conductors 200.6 Means of Identifying Grounded Conductors
75	200.7 Use of Insulation of a White or Gray Color or with Three Continuous White or Gray Stripes 200.9 Means of Identification of Terminals
76	200.10 Identification of Terminals 200.11 Polarity of Connections ARTICLE 210 Branch Circuits I. General Provisions 210.1 Scope 210.2 Other Articles for Specific-Purpose Branch 210.3 Rating 210.4 Multiwire Branch Circuits
77	210.5 Identification for Branch Circuits
78	210.6 Branch-Circuit Voltage Limitations
79	210.7 Multiple Branch Circuits 210.8 Ground-Fault Circuit-Interrupter Protection for Personnel
80	210.9 Circuits Derived from Autotransformers 210.10 Ungrounded Conductors Tapped from Grounded Systems 210.11 Branch Circuits Required 210.12 Arc-Fault Circuit-Interrupter Protection
82	210.13 Ground-Fault Protection of Equipment 210.17 Electric Vehicle Branch Circuit 210.18 Guest Rooms and Guest Suites II. Branch-Circuit Ratings 210.19 Conductors — Minimum Ampacity and Size
83	210.20 Overcurrent Protection 210.21 Outlet Devices
84	210.22 Permissible Loads, Individual Branch Circuits 210.23 Permissible Loads, Multiple-Outlet Branch Circuits 210.24 Branch-Circuit Requirements — Summary 210.25 Branch Circuits in Buildings with More Than One Occupancy
85	III. Required Outlets 210.50 General 210.52 Dwelling Unit Receptacle Outlets
88	210.60 Guest Rooms, Guest Suites, Dormitories, and Similar Occupancies 210.62 Show Windows 210.63 Heating, Air-Conditioning, and Refrigeration Equipment Outlet 210.64 Electrical Service Areas 210.70 Lighting Outlets Required
89	ARTICLE 215 Feeders 215.1 Scope 215.2 Minimum Rating and Size
90	215.3 Overcurrent Protection 215.4 Feeders with Common Neutral Conductor 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
91	ARTICLE 220 Branch-Circuit, Feeder, and Service Calculations I. General 220.1 Scope 220.3 Application of Other Articles
92	220.5 Calculations II. Branch-Circuit Load Calculations 220.10 General 220.12 Lighting Load for Specified Occupancies
93	220.14 Other Loads — All Occupancies
94	220.16 Loads for Additions to Existing Installations 220.18 Maximum Loads III. Feeder and Service Load Calculations 220.40 General 220.42 General Lighting 220.43 Show-Window and Track Lighting
95	220.44 Receptacle Loads — Other Than Dwelling Units 220.50 Motors 220.51 Fixed Electric Space Heating 220.52 Small-Appliance and Laundry Loads — Dwelling Unit 220.53 Appliance Load — Dwelling Unit(s) 220.54 Electric Clothes Dryers — Dwelling Unit(s)
96	220.55 Electric Cooking Appliances in Dwelling Units and Household Cooking Appliances Used in Instructional Programs 220.56 Kitchen Equipment — Other Than Dwelling Unit(s) 220.60 Noncoincident Loads 220.61 Feeder or Service Neutral Load
98	IV. Optional Feeder and Service Load Calculations 220.80 General 220.82 Dwelling Unit 220.83 Existing Dwelling Unit
99	220.84 Multifamily Dwelling
100	220.85 Two Dwelling Units 220.86 Schools 220.87 Determining Existing Loads 220.88 New Restaurants
101	V. Farm Load Calculations 220.100 General 220.102 Farm Loads — Buildings and Other Loads 220.103 Farm Loads — Total ARTICLE 225 Outside Branch Circuits and Feeders 225.1 Scope 225.3 Other Articles I. General 225.4 Conductor Covering 225.5 Size of Conductors 600 Volts, Nominal, or Less 225.6 Conductor Size and Support
102	225.7 Lighting Equipment Installed Outdoors 225.8 Calculation of Loads 1000 Volts, Nominal, or Less 225.10 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
103	225.15 Supports over Buildings 225.16 Attachment to Buildings 225.17 Masts as Supports 225.18 Clearance for Overhead Conductors and Cables 225.19 Clearances from Buildings for Conductors of Not over 1000 Volts, Nominal
104	225.20 Mechanical Protection of Conductors 225.21 Multiconductor Cables on Exterior Surfaces of Buildings (or Other Structures) 225.22 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 II. Buildings or Other Structures Supplied by a Feeder(s) or Branch Circuit(s) 225.30 Number of Supplies
105	225.31 Disconnecting Means 225.32 Location 225.33 Maximum Number of Disconnects 225.34 Grouping of Disconnects 225.35 Access to Occupants 225.36 Type 225.37 Identification
106	225.38 Disconnect Construction 225.39 Rating of Disconnect 225.40 Access to Overcurrent Protective Devices III. Over 1000 Volts 225.50 Sizing of Conductors 225.51 Isolating Switches 225.52 Disconnecting Means
107	225.56 Inspections and Tests 225.60 Clearances over Roadways, Walkways, Rail, Water, and Open Land
108	225.61 Clearances over Buildings and Other Structures ARTICLE 230 Services 230.1 Scope I. General 230.2 Number of Services
109	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 230.10 Vegetation as Support II. Overhead Service Conductors 230.22 Insulation or Covering
110	230.23 Size and Rating 230.24 Clearances 230.26 Point of Attachment 230.27 Means of Attachment 230.28 Service Masts as Supports
111	230.29 Supports over Buildings III. Underground Service Conductors 230.30 Installation 230.31 Size and Rating 230.32 Protection Against Damage 230.33 Spliced Conductors IV. Service-Entrance Conductors 230.40 Number of Service-Entrance Conductor Sets
112	230.41 Insulation of Service-Entrance Conductors 230.42 Minimum Size and Rating 230.43 Wiring Methods for 1000 Volts, Nominal, or Less
113	230.44 Cable Trays 230.46 Spliced Conductors 230.50 Protection Against Physical Damage 230.51 Mounting Supports
114	230.52 Individual Conductors Entering Buildings or Other Structures 230.53 Raceways to Drain 230.54 Overhead Service Locations 230.56 Service Conductor with the Higher Voltage to Ground V. Service Equipment — General 230.62 Service Equipment — Enclosed or Guarded 230.66 Marking VI. Service Equipment — Disconnecting Means 230.70 General
115	230.71 Maximum Number of Disconnects 230.72 Grouping of Disconnects 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
116	230.80 Combined Rating of Disconnects 230.81 Connection to Terminals 230.82 Equipment Connected to the Supply Side of Service Disconnect VII. Service Equipment — Overcurrent Protection 230.90 Where Required
117	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 230.95 Ground-Fault Protection of Equipment
118	VIII. Services Exceeding 1000 Volts, Nominal 230.200 General 230.202 Service-Entrance Conductors 230.204 Isolating Switches 230.205 Disconnecting Means 230.206 Overcurrent Devices as Disconnecting Means 230.208 Protection Requirements
119	230.209 Surge Arresters (Lightning Arresters) 230.210 Service Equipment — General Provisions 230.211 Switchgear 230.212 Over 35,000 Volts ARTICLE 240 Overcurrent Protection I. General 240.1 Scope 240.2 Definitions 240.3 Other Articles 240.4 Protection of Conductors
121	240.5 Protection of Flexible Cords, Flexible Cables, and Fixture Wires 240.6 Standard Ampere Ratings
122	240.8 Fuses or Circuit Breakers in Parallel 240.9 Thermal Devices 240.10 Supplementary Overcurrent Protection 240.12 Electrical System Coordination 240.13 Ground-Fault Protection of Equipment 240.15 Ungrounded Conductors
123	II. Location 240.21 Location in Circuit
125	240.22 Grounded Conductor 240.23 Change in Size of Grounded Conductor 240.24 Location in or on Premises
126	III. Enclosures 240.30 General 240.32 Damp or Wet Locations 240.33 Vertical Position IV. Disconnecting and Guarding 240.40 Disconnecting Means for Fuses 240.41 Arcing or Suddenly Moving Parts V. Plug Fuses, Fuseholders, and Adapters 240.50 General
127	240.51 Edison-Base Fuses 240.52 Edison-Base Fuseholders 240.53 Type S Fuses 240.54 Type S Fuses, Adapters, and Fuseholders VI. Cartridge Fuses and Fuseholders 240.60 General 240.61 Classification VII. Circuit Breakers 240.80 Method of Operation 240.81 Indicating
128	240.82 Nontamperable 240.83 Marking 240.85 Applications 240.86 Series Ratings 240.87 Arc Energy Reduction
129	VIII. Supervised Industrial Installations 240.90 General 240.91 Protection of Conductors 240.92 Location in Circuit
130	IX. Overcurrent Protection over 1000 Volts, Nominal 240.100 Feeders and Branch Circuits
131	240.101 Additional Requirements for Feeders ARTICLE 250 Grounding and Bonding I. General 250.1 Scope 250.2 Definition 250.3 Application of Other Articles 250.4 General Requirements for Grounding and Bonding
133	250.6 Objectionable Current
134	250.8 Connection of Grounding and Bonding Equipment 250.10 Protection of Ground Clamps and Fittings 250.12 Clean Surfaces II. System Grounding 250.20 Alternating-Current Systems to Be Grounded 250.21 Alternating-Current Systems of 50 Volts to 1000 Volts Not Required to Be Grounded
135	250.22 Circuits Not to Be Grounded 250.24 Grounding Service-Supplied Alternating-Current Systems
136	250.26 Conductor to Be Grounded — Alternating-Current Systems 250.28 Main Bonding Jumper and System Bonding Jumper 250.30 Grounding Separately Derived Alternating-Current Systems
139	250.32 Buildings or Structures Supplied by a Feeder(s) or Branch Circuit(s)
140	250.34 Portable and Vehicle-Mounted Generators
141	250.35 Permanently Installed Generators 250.36 High-Impedance Grounded Neutral Systems
142	III. Grounding Electrode System and Grounding Electrode Conductor 250.50 Grounding Electrode System 250.52 Grounding Electrodes 250.53 Grounding Electrode System Installation
143	250.54 Auxiliary Grounding Electrodes 250.58 Common Grounding Electrode
144	250.60 Use of Strike Termination Devices 250.62 Grounding Electrode Conductor Material 250.64 Grounding Electrode Conductor Installation
145	250.66 Size of Alternating-Current Grounding Electrode 250.68 Grounding Electrode Conductor and Bonding Jumper Connection to Grounding Electrodes
146	250.70 Methods of Grounding and Bonding Conductor Connection to Electrodes
147	IV. Enclosure, Raceway, and Service Cable Connections 250.80 Service Raceways and Enclosures 250.84 Underground Service Cable or Raceway 250.86 Other Conductor Enclosures and Raceways V. Bonding 250.90 General 250.92 Services
148	250.94 Bonding for Other Systems 250.96 Bonding Other Enclosures 250.97 Bonding for Over 250 Volts
149	250.98 Bonding Loosely Jointed Metal Raceways 250.100 Bonding in Hazardous (Classified) Locations 250.102 Bonding Conductors and Jumpers
150	250.104 Bonding of Piping Systems and Exposed Structural Metal
151	250.106 Lightning Protection Systems VI. Equipment Grounding and Equipment Grounding Conductors 250.110 Equipment Fastened in Place (Fixed) or Connected by Permanent Wiring Methods
152	250.112 Specific Equipment Fastened in Place (Fixed) or Connected by Permanent Wiring Methods 250.114 Equipment Connected by Cord and Plug
153	250.116 Nonelectrical Equipment 250.118 Types of Equipment Grounding Conductors
154	250.119 Identification of Equipment Grounding Conductors 250.120 Equipment Grounding Conductor Installation
155	250.121 Use of Equipment Grounding Conductors 250.122 Size of Equipment Grounding Conductors 250.124 Equipment Grounding Conductor Continuity 250.126 Identification of Wiring Device Terminals
156	VII. Methods of Equipment Grounding 250.130 Equipment Grounding Conductor Connections 250.132 Short Sections of Raceway 250.134 Equipment Fastened in Place or Connected by Permanent Wiring Methods (Fixed) — Grounding
157	250.136 Equipment Considered Grounded 250.138 Cord-and-Plug-Connected Equipment 250.140 Frames of Ranges and Clothes Dryers 250.142 Use of Grounded Circuit Conductor for Grounding Equipment
158	250.144 Multiple Circuit Connections 250.146 Connecting Receptacle Grounding Terminal to Box 250.148 Continuity and Attachment of Equipment Grounding Conductors to Boxes
159	VIII. Direct-Current Systems 250.160 General 250.162 Direct-Current Circuits and Systems to Be Grounded 250.164 Point of Connection for Direct-Current Systems 250.166 Size of the Direct-Current Grounding Electrode Conductor 250.167 Direct-Current Ground-Fault Detection
160	250.168 Direct-Current System Bonding Jumper 250.169 Ungrounded Direct-Current Separately Derived Systems IX. Instruments, Meters, and Relays 250.170 Instrument Transformer Circuits 250.172 Instrument Transformer Cases 250.174 Cases of Instruments, Meters, and Relays Operating at 1000 Volts or Less 250.176 Cases of Instruments, Meters, and Relays — Operating at 1000 Volts and Over 250.178 Instrument Equipment Grounding Conductor
161	X. Grounding of Systems and Circuits of over 1000 Volts 250.180 General 250.182 Derived Neutral Systems 250.184 Solidly Grounded Neutral Systems 250.186 Ground-Fault Circuit Conductor Brought to Service Equipment
162	250.187 Impedance Grounded Neutral Systems
163	250.188 Grounding of Systems Supplying Portable or Mobile Equipment 250.190 Grounding of Equipment 250.191 Grounding System at Alternating-Current Substations
164	250.194 Grounding and Bonding of Fences and Other Metal Structures ARTICLE 280 Surge Arresters, Over 1000 Volts I. General 280.1 Scope 280.2 Uses Not Permitted 280.3 Number Required 280.4 Surge Arrester Selection II. Installation 280.11 Location 280.12 Routing of Surge Arrester Grounding Conductors
165	III. Connecting Surge Arresters 280.21 Connection 280.23 Surge-Arrester Conductors 280.24 Interconnections 280.25 Grounding Electrode Conductor Connections and Enclosures ARTICLE 285 Surge-Protective Devices (SPDs), 1000 Volts or Less I. General 285.1 Scope 285.3 Uses Not Permitted 285.4 Number Required 285.5 Listing
166	285.6 Short-Circuit Current Rating II. Installation 285.11 Location 285.12 Routing of Connections 285.13 Type 4 and Other Component Type SPDs III. Connecting SPDs 285.21 Connection 285.23 Type 1 SPDs 285.24 Type 2 SPDs 285.25 Type 3 SPDs 285.26 Conductor Size 285.27 Connection Between Conductors 285.28 Grounding Electrode Conductor Connections and Enclosures
181	Chapter 3 Wiring Methods and Materials ARTICLE 300 General Requirements for Wiring Methods and Materials I. General Requirements 300.1 Scope 300.2 Limitations 300.3 Conductors
182	300.4 Protection Against Physical Damage
183	300.5 Underground Installations
185	300.6 Protection Against Corrosion and Deterioration
186	300.7 Raceways Exposed to Different Temperatures 300.8 Installation of Conductors with Other Systems 300.9 Raceways in Wet Locations Abovegrade
187	300.10 Electrical Continuity of Metal Raceways and Enclosures 300.11 Securing and Supporting 300.12 Mechanical Continuity — Raceways and Cables 300.13 Mechanical and Electrical Continuity — Conductors 300.14 Length of Free Conductors at Outlets, Junctions, and Switch Points
188	300.15 Boxes, Conduit Bodies, or Fittings — Where Required 300.16 Raceway or Cable to Open or Concealed Wiring 300.17 Number and Size of Conductors in Raceway
189	300.18 Raceway Installations 300.19 Supporting Conductors in Vertical Raceways
190	300.20 Induced Currents in Ferrous Metal Enclosures or Ferrous Metal Raceways 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 (Plenums)
191	300.23 Panels Designed to Allow Access II. Requirements for over 1000 Volts, Nominal 300.31 Covers Required 300.32 Conductors of Different Systems 300.34 Conductor Bending Radius
192	300.35 Protection Against Induction Heating 300.37 Aboveground Wiring Methods 300.38 Raceways in Wet Locations Above Grade 300.39 Braid-Covered Insulated Conductors — Exposed Installation 300.40 Insulation Shielding 300.42 Moisture or Mechanical Protection for Metal-Sheathed Cables 300.45 Warning Signs 300.50 Underground Installations
193	ARTICLE 310 Conductors for General Wiring I. General 310.1 Scope
194	310.2 Definitions II. Installation 310.10 Uses Permitted
195	310.15 Ampacities for Conductors Rated 0–2000 Volts
204	310.60 Conductors Rated 2001 to 35,000 Volts
214	III. Construction Specifications 310.104 Conductor Constructions and Applications
217	310.106 Conductors
218	310.110 Conductor Identification
219	310.120 Marking ARTICLE 312 Cabinets, Cutout Boxes, and Meter Socket Enclosures I. Scope and Installation 312.1 Scope
220	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 312.6 Deflection of Conductors
221	312.7 Space in Enclosures 312.8 Switch and Overcurrent Device Enclosures with Splices, Taps, and Feed-Through Conductors 312.9 Side or Back Wiring Spaces or Gutters II. Construction Specifications 312.10 Material
223	312.11 Spacing ARTICLE 314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures I. Scope and General 314.1 Scope 314.2 Round Boxes 314.3 Nonmetallic Boxes
224	314.4 Metal Boxes II. Installation 314.15 Damp or Wet Locations 314.16 Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit Bodies
226	314.17 Conductors Entering Boxes, Conduit Bodies, or Fittings 314.19 Boxes Enclosing Flush Devices 314.20 In Wall or Ceiling 314.21 Repairing Noncombustible Surfaces 314.22 Surface Extensions 314.23 Supports
228	314.24 Depth of Boxes 314.25 Covers and Canopies 314.27 Outlet Boxes
229	314.28 Pull and Junction Boxes and Conduit Bodies
230	314.29 Boxes, Conduit Bodies, and Handhole Enclosures to Be Accessible 314.30 Handhole Enclosures III. Construction Specifications 314.40 Metal Boxes, Conduit Bodies, and Fittings
231	314.41 Covers 314.42 Bushings 314.43 Nonmetallic Boxes 314.44 Marking IV. Pull and Junction Boxes, Conduit Bodies, and Handhole Enclosures for Use on Systems over 1000 Volts, Nominal 314.70 General 314.71 Size of Pull and Junction Boxes, Conduit Bodies, and Handhole Enclosures
232	314.72 Construction and Installation Requirements ARTICLE 320 Armored Cable: Type AC I. General 320.1 Scope 320.2 Definition II. Installation 320.10 Uses Permitted 320.12 Uses Not Permitted 320.15 Exposed Work
233	320.17 Through or Parallel to Framing Members 320.23 In Accessible Attics 320.24 Bending Radius 320.30 Securing and Supporting 320.40 Boxes and Fittings 320.80 Ampacity III. Construction Specifications 320.100 Construction 320.104 Conductors
234	320.108 Equipment Grounding Conductor 320.120 Marking ARTICLE 322 Flat Cable Assemblies: Type FC I. General 322.2 Definition II. Installation 322.10 Uses Permitted 322.12 Uses Not Permitted 322.30 Securing and Supporting 322.40 Boxes and Fittings 322.56 Splices and Taps III. Construction 322.100 Construction 322.104 Conductors 322.112 Insulation 322.120 Marking
235	ARTICLE 324 Flat Conductor Cable: Type FCC I. General 324.1 Scope 324.2 Definitions 324.6 Listing Requirements II. Installation 324.10 Uses Permitted 324.12 Uses Not Permitted
236	324.18 Crossings 324.30 Securing and Supporting 324.40 Boxes and Fittings 324.41 Floor Coverings 324.42 Devices 324.56 Splices and Taps 324.60 Grounding III. Construction 324.100 Construction
237	324.101 Corrosion Resistance 324.112 Insulation 324.120 Markings ARTICLE 326 Integrated Gas Spacer Cable: Type IGS I. General 326.1 Scope 326.2 Definition II. Installation 326.10 Uses Permitted 326.12 Uses Not Permitted 326.24 Bending Radius 326.26 Bends 326.40 Fittings 326.80 Ampacity III. Construction Specifications 326.104 Conductors
238	326.112 Insulation 326.116 Conduit 326.120 Marking ARTICLE 328 Medium Voltage Cable: Type MV I. General 328.1 Scope 328.2 Definition II. Installation 328.10 Uses Permitted 328.12 Uses Not Permitted 328.14 Installation 328.80 Ampacity III. Construction Specifications 328.100 Construction 328.120 Marking ARTICLE 330 Metal-Clad Cable: Type MC
239	I. General 330.1 Scope 330.2 Definition II. Installation 330.10 Uses Permitted 330.12 Uses Not Permitted 330.17 Through or Parallel to Framing Members 330.23 In Accessible Attics 330.24 Bending Radius
240	330.30 Securing and Supporting 330.31 Single Conductors 330.40 Boxes and Fittings 330.80 Ampacity III. Construction Specifications 330.104 Conductors 330.108 Equipment Grounding Conductor 330.112 Insulation 330.116 Sheath
241	ARTICLE 332 Mineral-Insulated, Metal-Sheathed Cable: Type MI I. General 332.1 Scope 332.2 Definition 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 332.31 Single Conductors 332.40 Boxes and Fittings
242	332.80 Ampacity III. Construction Specifications 332.104 Conductors 332.108 Equipment Grounding Conductor 332.112 Insulation 332.116 Sheath ARTICLE 334 Nonmetallic-Sheathed Cable: Types NM, NMC, and NMS I. General 334.1 Scope 334.2 Definitions 334.6 Listed II. Installation 334.10 Uses Permitted
243	334.12 Uses Not Permitted 334.15 Exposed Work 334.17 Through or Parallel to Framing Members 334.23 In Accessible Attics 334.24 Bending Radius 334.30 Securing and Supporting
244	334.40 Boxes and Fittings 334.80 Ampacity III. Construction Specifications 334.100 Construction 334.104 Conductors 334.108 Equipment Grounding Conductor 334.112 Insulation 334.116 Sheath
245	ARTICLE 336 Power and Control Tray Cable: Type TC I. General 336.1 Scope 336.2 Definition II. Installation 336.10 Uses Permitted 336.12 Uses Not Permitted 336.24 Bending Radius 336.80 Ampacity III. Construction Specifications 336.100 Construction 336.104 Conductors
246	336.116 Jacket 336.120 Marking ARTICLE 338 Service-Entrance Cable: Types SE and USE I. General 338.1 Scope 338.2 Definitions II. Installation 338.10 Uses Permitted 338.12 Uses Not Permitted
247	338.24 Bending Radius III. Construction 338.100 Construction 338.120 Marking ARTICLE 340 Underground Feeder and Branch-Circuit Cable: Type UF I. General 340.1 Scope 340.2 Definition 340.6 Listing Requirements II. Installation 340.10 Uses Permitted 340.12 Uses Not Permitted
248	340.24 Bending Radius 340.80 Ampacity III. Construction Specifications 340.104 Conductors 340.108 Equipment Grounding Conductor 340.112 Insulation 340.116 Sheath ARTICLE 342 Intermediate Metal Conduit: Type IMC I. General 342.1 Scope 342.2 Definition 342.6 Listing Requirements II. Installation 342.10 Uses Permitted 342.14 Dissimilar Metals 342.20 Size 342.22 Number of Conductors 342.24 Bends — How Made
249	342.26 Bends — Number in One Run 342.28 Reaming and Threading 342.30 Securing and Supporting 342.42 Couplings and Connectors 342.46 Bushings 342.56 Splices and Taps 342.60 Grounding III. Construction Specifications 342.120 Marking 342.130 Standard Lengths ARTICLE 344 Rigid Metal Conduit: Type RMC I. General 344.1 Scope 344.2 Definition 344.6 Listing Requirements
250	II. Installation 344.10 Uses Permitted 344.14 Dissimilar Metals 344.20 Size 344.22 Number of Conductors 344.24 Bends — How Made 344.26 Bends — Number in One Run 344.28 Reaming and Threading 344.30 Securing and Supporting
251	344.42 Couplings and Connectors 344.46 Bushings 344.56 Splices and Taps 344.60 Grounding III. Construction Specifications 344.100 Construction 344.120 Marking 344.130 Standard Lengths ARTICLE 348 Flexible Metal Conduit: Type FMC I. General 348.1 Scope 348.2 Definition 348.6 Listing Requirements
252	II. Installation 348.10 Uses Permitted 348.12 Uses Not Permitted 348.20 Size 348.22 Number of Conductors 348.24 Bends — How Made 348.26 Bends — Number in One Run 348.28 Trimming 348.30 Securing and Supporting
253	348.42 Couplings and Connectors 348.56 Splices and Taps 348.60 Grounding and Bonding ARTICLE 350 Liquidtight Flexible Metal Conduit: Type LFMC I. General 350.1 Scope 350.2 Definition 350.6 Listing Requirements II. Installation 350.10 Uses Permitted 350.12 Uses Not Permitted 350.20 Size
254	350.22 Number of Conductors or Cables 350.24 Bends — How Made 350.26 Bends — Number in One Run 350.30 Securing and Supporting 350.42 Couplings and Connectors 350.56 Splices and Taps 350.60 Grounding and Bonding III. Construction Specifications 350.120 Marking ARTICLE 352 Rigid Polyvinyl Chloride Conduit: Type PVC I. General 352.1 Scope
255	352.2 Definition 352.6 Listing Requirements II. Installation 352.10 Uses Permitted 352.12 Uses Not Permitted 352.20 Size 352.22 Number of Conductors 352.24 Bends — How Made
256	352.26 Bends — Number in One Run 352.28 Trimming 352.30 Securing and Supporting 352.44 Expansion Fittings 352.46 Bushings 352.48 Joints 352.56 Splices and Taps 352.60 Grounding III. Construction Specifications 352.100 Construction 352.120 Marking
257	ARTICLE 353 High Density Polyethylene Conduit: Type HDPE Conduit I. General 353.1 Scope 353.2 Definition 353.6 Listing Requirements II. Installation 353.10 Uses Permitted 353.12 Uses Not Permitted
258	353.20 Size 353.22 Number of Conductors 353.24 Bends — How Made 353.26 Bends — Number in One Run 353.28 Trimming 353.46 Bushings 353.48 Joints 353.56 Splices and Taps 353.60 Grounding III. Construction Specifications 353.100 Construction 353.120 Marking ARTICLE 354 Nonmetallic Underground Conduit with Conductors: Type NUCC I. General 354.1 Scope 354.2 Definition 354.6 Listing Requirements II. Installation 354.10 Uses Permitted
259	354.12 Uses Not Permitted 354.20 Size 354.22 Number of Conductors 354.24 Bends — How Made 354.26 Bends — Number in One Run 354.28 Trimming 354.46 Bushings 354.48 Joints 354.50 Conductor Terminations 354.56 Splices and Taps 354.60 Grounding III. Construction Specifications 354.100 Construction
260	354.120 Marking ARTICLE 355 Reinforced Thermosetting Resin Conduit: Type RTRC I. General 355.1 Scope 355.2 Definition 355.6 Listing Requirements II. Installation 355.10 Uses Permitted 355.12 Uses Not Permitted
261	355.20 Size 355.22 Number of Conductors 355.24 Bends — How Made 355.26 Bends — Number in One Run 355.28 Trimming 355.30 Securing and Supporting 355.44 Expansion Fittings 355.46 Bushings 355.48 Joints 355.56 Splices and Taps 355.60 Grounding III. Construction Specifications 355.100 Construction
262	355.120 Marking ARTICLE 356 Liquidtight Flexible Nonmetallic Conduit: Type LFNC I. General 356.1 Scope 356.2 Definition
263	356.6 Listing Requirements II. Installation 356.10 Uses Permitted 356.12 Uses Not Permitted 356.20 Size 356.22 Number of Conductors 356.24 Bends — How Made 356.26 Bends — Number in One Run 356.28 Trimming 356.30 Securing and Supporting
264	356.42 Couplings and Connectors 356.56 Splices and Taps 356.60 Grounding III. Construction Specifications 356.100 Construction 356.120 Marking ARTICLE 358 Electrical Metallic Tubing: Type EMT I. General 358.2 Definition 358.6 Listing Requirements II. Installation 358.10 Uses Permitted 358.12 Uses Not Permitted 358.20 Size
265	358.22 Number of Conductors 358.24 Bends — How Made 358.26 Bends — Number in One Run 358.28 Reaming and Threading 358.30 Securing and Supporting 358.42 Couplings and Connectors 358.56 Splices and Taps 358.60 Grounding III. Construction Specifications 358.100 Construction 358.120 Marking ARTICLE 360 Flexible Metallic Tubing: Type FMT I. General 360.1 Scope 360.2 Definition 360.6 Listing Requirements II. Installation 360.10 Uses Permitted
266	360.12 Uses Not Permitted 360.20 Size 360.22 Number of Conductors 360.24 Bends 360.56 Splices and Taps 360.60 Grounding III. Construction Specifications 360.120 Marking ARTICLE 362 Electrical Nonmetallic Tubing: Type ENT I. General 362.1 Scope 362.2 Definition
267	362.6 Listing Requirements II. Installation 362.10 Uses Permitted 362.12 Uses Not Permitted 362.20 Size 362.22 Number of Conductors
268	362.24 Bends — How Made 362.26 Bends — Number in One Run 362.28 Trimming 362.30 Securing and Supporting 362.46 Bushings 362.48 Joints 362.56 Splices and Taps 362.60 Grounding III. Construction Specifications 362.100 Construction 362.120 Marking ARTICLE 366 Auxiliary Gutters I. General 366.1 Scope 366.2 Definitions
269	366.6 Listing Requirements II. Installation 366.10 Uses Permitted 366.12 Uses Not Permitted 366.22 Number of Conductors 366.23 Ampacity of Conductors 366.30 Securing and Supporting
270	366.44 Expansion Fittings 366.56 Splices and Taps 366.58 Insulated Conductors 366.60 Grounding III. Construction Specifications 366.100 Construction 366.120 Marking ARTICLE 368 Busways I. General Requirements 368.1 Scope 368.2 Definition
271	II. Installation 368.10 Uses Permitted 368.12 Uses Not Permitted 368.17 Overcurrent Protection
272	368.30 Support 368.56 Branches from Busways 368.58 Dead Ends 368.60 Grounding III. Construction 368.120 Marking IV. Requirements for Over 600 Volts, Nominal 368.214 Adjacent and Supporting Structures 368.234 Barriers and Seals 368.236 Drain Facilities
273	368.237 Ventilated Bus Enclosures 368.238 Terminations and Connections 368.239 Switches 368.240 Wiring 600 Volts or Less, Nominal 368.244 Expansion Fittings 368.258 Neutral Conductor 368.260 Grounding 368.320 Marking ARTICLE 370 Cablebus I. General 370.1 Scope 370.2 Definition II. Installation 370.10 Uses Permitted 370.12 Uses Not Permitted 370.18 Cablebus Installation
274	370.20 Conductor Size and Termination 370.22 Number of Conductors 370.23 Overcurrent Protection 370.30 Securing and Supporting 370.42 Fittings 370.60 Grounding 370.80 Ampacity of Conductors III. Construction Specifications 370.120 Marking ARTICLE 372 Cellular Concrete Floor Raceways 372.1 Scope 372.2 Definitions 372.4 Uses Not Permitted
275	372.5 Header 372.6 Connection to Cabinets and Other Enclosures 372.7 Junction Boxes 372.8 Markers 372.9 Inserts 372.10 Size of Conductors 372.11 Maximum Number of Conductors 372.12 Splices and Taps 372.13 Discontinued Outlets 372.17 Ampacity of Conductors ARTICLE 374 Cellular Metal Floor Raceways 374.1 Scope 374.2 Definitions 374.3 Uses Not Permitted I. Installation 374.4 Size of Conductors 374.5 Maximum Number of Conductors in Raceway
276	374.6 Splices and Taps 374.7 Discontinued Outlets 374.8 Markers 374.9 Junction Boxes 374.10 Inserts 374.11 Connection to Cabinets and Extensions from Cells 374.17 Ampacity of Conductors II. Construction Specifications 374.100 General ARTICLE 376 Metal Wireways I. General 376.1 Scope 376.2 Definition II. Installation 376.10 Uses Permitted 376.12 Uses Not Permitted 376.21 Size of Conductors 376.22 Number of Conductors and Ampacity
277	376.23 Insulated Conductors 376.30 Securing and Supporting 376.56 Splices, Taps, and Power Distribution Blocks 376.58 Dead Ends 376.70 Extensions from Metal Wireways III. Construction Specifications 376.100 Construction 376.120 Marking
278	ARTICLE 378 Nonmetallic Wireways I. General 378.1 Scope 378.2 Definition 378.6 Listing Requirements II. Installation 378.10 Uses Permitted 378.12 Uses Not Permitted 378.21 Size of Conductors 378.22 Number of Conductors 378.23 Insulated Conductors 378.30 Securing and Supporting
279	378.44 Expansion Fittings 378.56 Splices and Taps 378.58 Dead Ends 378.60 Grounding 378.70 Extensions from Nonmetallic Wireways III. Construction Specifications 378.120 Marking 380.12 Uses Not Permitted 380.23 Insulated Conductors 380.76 Metal Multioutlet Assembly Through Dry Partitions ARTICLE 382 Nonmetallic Extensions I. General 382.1 Scope
280	ARTICLE 380 Multioutlet Assembly I. General 380.1 Scope II. Installation 380.10 Uses Permitted 382.2 Definitions 382.6 Listing Requirements II. Installation 382.10 Uses Permitted 382.12 Uses Not Permitted 382.15 Exposed 382.26 Bends 382.30 Securing and Supporting 382.40 Boxes and Fittings 382.42 Devices
281	382.56 Splices and Taps III. Construction Specifications (Concealable Nonmetallic Extensions Only) 382.100 Construction 382.104 Flat Conductors 382.112 Insulation 382.120 Marking ARTICLE 384 Strut-Type Channel Raceway I. General 384.1 Scope 384.2 Definition 384.6 Listing Requirements II. Installation 384.10 Uses Permitted
282	384.12 Uses Not Permitted 384.21 Size of Conductors 384.22 Number of Conductors 384.30 Securing and Supporting 384.56 Splices and Taps 384.60 Grounding III. Construction Specifications 384.100 Construction
283	384.120 Marking ARTICLE 386 Surface Metal Raceways I. General 386.1 Scope 386.2 Definition 386.6 Listing Requirements II. Installation 386.10 Uses Permitted 386.12 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 III. Construction Specifications 386.100 Construction
284	386.120 Marking ARTICLE 388 Surface Nonmetallic Raceways I. General 388.1 Scope 388.2 Definition 388.6 Listing Requirements 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 III. Construction Specifications 388.100 Construction 388.120 Marking
285	ARTICLE 390 Underfloor Raceways 390.1 Scope 390.2 Definition 390.3 Use 390.4 Covering 390.5 Size of Conductors 390.6 Maximum Number of Conductors in Raceway 390.7 Splices and Taps 390.8 Discontinued Outlets 390.9 Laid in Straight Lines 390.10 Markers at Ends 390.11 Dead Ends 390.13 Junction Boxes
286	390.14 Inserts 390.15 Connections to Cabinets and Wall Outlets 390.17 Ampacity of Conductors ARTICLE 392 Cable Trays I. General 392.1 Scope 392.2 Definition II. Installation 392.10 Uses Permitted 392.12 Uses Not Permitted 392.18 Cable Tray Installation
288	392.20 Cable and Conductor Installation 392.22 Number of Conductors or Cables
290	392.30 Securing and Supporting 392.46 Bushed Conduit and Tubing 392.56 Cable Splices
291	392.60 Grounding and Bonding
292	392.80 Ampacity of Conductors
293	392.100 Construction ARTICLE 393 Low-Voltage Suspended Ceiling Power Distribution Systems I. General 393.1 Scope 393.2 Definitions
294	393.6 Listing Requirements II. Installation 393.10 Uses Permitted 393.12 Uses Not Permitted 393.14 Installation
295	393.21 Disconnecting Means 393.30 Securing and Supporting 393.40 Connectors and Enclosures 393.45 Overcurrent and Reverse Polarity (Backfeed) Protection 393.56 Splices 393.57 Connections 393.60 Grounding
296	III. Construction Specifications 393.104 Sizes and Types of Conductors ARTICLE 394 Concealed Knob-and-Tube Wiring I. General 394.1 Scope 394.2. Definition II. Installation 394.10 Uses Permitted 394.12 Uses Not Permitted 394.17 Through or Parallel to Framing Members 394.19 Clearances 394.23 In Accessible Attics
297	394.30 Securing and Supporting 394.42 Devices 394.56 Splices and Taps III. Construction Specifications 394.104 Conductors ARTICLE 396 Messenger-Supported Wiring I. General 396.1 Scope 396.2 Definition II. Installation 396.10 Uses Permitted
298	396.12 Uses Not Permitted 396.30 Messenger 396.56 Conductor Splices and Taps 396.60 Grounding ARTICLE 398 Open Wiring on Insulators I. General 398.1 Scope 398.2 Definition II. Installation 398.10 Uses Permitted 398.12 Uses Not Permitted 398.15 Exposed Work
299	398.17 Through or Parallel to Framing Members 398.19 Clearances 398.23 In Accessible Attics 398.30 Securing and Supporting 398.42 Devices III. Construction Specifications 398.104 Conductors
300	ARTICLE 399 Outdoor Overhead Conductors over 1000 Volts 399.1 Scope 399.2 Definition 399.10 Uses Permitted 399.30 Support
307	Chapter 4 Equipment for General Use ARTICLE 400 Flexible Cords and Cables I. General 400.1 Scope 400.2 Other Articles 400.3 Suitability 400.4 Types
314	400.5 Ampacities for Flexible Cords and Cables
315	400.6 Markings
316	400.7 Uses Permitted 400.8 Uses Not Permitted 400.9 Splices 400.10 Pull at Joints and Terminals
317	400.13 Overcurrent Protection 400.14 Protection from Damage II. Construction Specifications 400.20 Labels 400.21 Construction 400.22 Grounded-Conductor Identification 400.23 Equipment Grounding Conductor Identification 400.24 Attachment Plugs
318	III. Portable Cables Over 600 Volts, Nominal 400.31 Construction 400.32 Shielding 400.33 Equipment Grounding Conductors 400.34 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
322	402.5 Allowable Ampacities for Fixture Wires 402.6 Minimum Size 402.7 Number of Conductors in Conduit or Tubing 402.8 Grounded Conductor Identification 402.9 Marking 402.10 Uses Permitted 402.11 Uses Not Permitted 402.12 Overcurrent Protection ARTICLE 404 Switches I. Installation 404.1 Scope 404.2 Switch Connections
323	404.3 Enclosure 404.4 Damp or Wet Locations 404.5 Time Switches, Flashers, and Similar Devices 404.6 Position and Connection of Switches 404.7 Indicating
324	404.8 Accessibility and Grouping 404.9 Provisions for General-Use Snap Switches 404.10 Mounting of Snap Switches
325	404.11 Circuit Breakers as Switches 404.12 Grounding of Enclosures 404.13 Knife Switches 404.14 Rating and Use of Snap Switches
326	II. Construction Specifications 404.15 Marking 404.16 Knife Switches Rated 600 to 1000 Volts 404.17 Fused Switches 404.18 Wire-Bending Space ARTICLE 406 Receptacles, Cord Connectors, and Attachment Plugs (Caps) 406.1 Scope 406.2 Definition 406.3 Receptacle Rating and Type
327	406.4 General Installation Requirements
328	406.5 Receptacle Mounting 406.6 Receptacle Faceplates (Cover Plates) 406.7 Attachment Plugs, Cord Connectors, and Flanged Surface Devices
329	406.8 Noninterchangeability 406.9 Receptacles in Damp or Wet Locations 406.10 Grounding-Type Receptacles, Adapters, Cord Connectors, and Attachment Plugs
330	406.11 Connecting Receptacle Grounding Terminal to Box 406.12 Tamper-Resistant Receptacles 406.15 Dimmer-Controlled Receptacles ARTICLE 408 Switchboards, Switchgear, and Panelboards I. General 408.1 Scope
331	408.2 Other Articles 408.3 Support and Arrangement of Busbars and Conductors
332	408.4 Field Identification Required 408.5 Clearance for Conductor Entering Bus Enclosures 408.7 Unused Openings 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
333	408.22 Grounding of Instruments, Relays, Meters, and Instrument Transformers on Switchboards and Switchgear III. Panelboards 408.30 General 408.36 Overcurrent Protection 408.37 Panelboards in Damp or Wet Locations 408.38 Enclosure 408.39 Relative Arrangement of Switches and Fuses 408.40 Grounding of Panelboards
334	408.41 Grounded Conductor Terminations 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 408.56 Minimum Spacings 408.58 Panelboard Marking
335	ARTICLE 409 Industrial Control Panels I. General 409.1 Scope 409.3 Other Articles II. Installation 409.20 Conductor — Minimum Size and Ampacity 409.21 Overcurrent Protection
336	409.22 Short-Circuit Current Rating 409.30 Disconnecting Means 409.60 Grounding III. Construction Specifications 409.100 Enclosures 409.102 Busbars and Conductors 409.104 Wiring Space 409.106 Spacings 409.108 Service Equipment 409.110 Marking
337	ARTICLE 410 Luminaires, Lampholders, and Lamps I. General 410.1 Scope 410.2 Definition 410.5 Live Parts 410.6 Listing Required 410.8 Inspection II. Luminaire Locations 410.10 Luminaires in Specific Locations
338	410.11 Luminaires Near Combustible Material 410.12 Luminaires over Combustible Material 410.14 Luminaires in Show Windows 410.16 Luminaires in Clothes Closets 410.18 Space for Cove Lighting
339	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 IV. Luminaire Supports 410.30 Supports 410.36 Means of Support
340	V. Grounding 410.40 General 410.42 Luminaire(s) with Exposed Conductive Parts 410.44 Methods of Grounding 410.46 Equipment Grounding Conductor Attachment VI. Wiring of Luminaires 410.48 Luminaire Wiring — General 410.50 Polarization of Luminaires 410.52 Conductor Insulation 410.54 Pendant Conductors for Incandescent Filament Lamps
341	410.56 Protection of Conductors and Insulation 410.59 Cord-Connected Showcases 410.62 Cord-Connected Lampholders and Luminaires
342	410.68 Feeder and Branch-Circuit Conductors and Ballasts VII. Construction of Luminaires 410.70 Combustible Shades and Enclosures 410.74 Luminaire Rating 410.82 Portable Luminaires 410.84 Cord Bushings 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 IX. Lamps and Auxiliary Equipment 410.103 Bases, Incandescent Lamps
343	410.104 Electric-Discharge Lamp Auxiliary Equipment X. Special Provisions for Flush and Recessed Luminaires 410.110 General 410.115 Temperature 410.116 Clearance and Installation 410.117 Wiring XI. Construction of Flush and Recessed Luminaires 410.118 Temperature 410.120 Lamp Wattage Marking 410.121 Solder Prohibited 410.122 Lampholders XII. Special Provisions for Electric-Discharge Lighting Systems of 1000 Volts or Less 410.130 General
344	410.134 Direct-Current Equipment 410.135 Open-Circuit Voltage Exceeding 300 Volts 410.136 Luminaire Mounting
345	410.137 Equipment Not Integral with Luminaire 410.138 Autotransformers 410.139 Switches XIII. Special Provisions for Electric-Discharge Lighting Systems of More Than 1000 Volts 410.140 General 410.141 Control 410.142 Lamp Terminals and Lampholders 410.143 Transformers
346	410.144 Transformer Locations 410.145 Exposure to Damage 410.146 Marking XIV. Lighting Track 410.151 Installation 410.153 Heavy-Duty Lighting Track 410.154 Fastening 410.155 Construction Requirements XV. Decorative Lighting and Similar Accessories 410.160 Listing of Decorative Lighting ARTICLE 411 Lighting Systems Operating at 30 Volts or Less and Lighting Equipment Connected to Class-2 Power Sources 411.1 Scope
347	411.3 Low-Voltage Lighting Systems 411.4 Listing Required 411.5 Specific Location Requirements 411.6 Secondary Circuits 411.7 Branch Circuit 411.8 Hazardous (Classified) Locations ARTICLE 422 Appliances I. General 422.1 Scope 422.2 Definition 422.3 Other Articles
348	422.4 Live Parts 422.5 Ground-Fault Circuit-Interrupter (GFCI) Protection II. Installation 422.10 Branch-Circuit Rating 422.11 Overcurrent Protection
349	422.12 Central Heating Equipment 422.13 Storage-Type Water Heaters 422.14 Infrared Lamp Industrial Heating Appliances 422.15 Central Vacuum Outlet Assemblies 422.16 Flexible Cords
350	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 Other Installation Methods 422.23 Tire Inflation and Automotive Vacuum Machines III. Disconnecting Means 422.30 General 422.31 Disconnection of Permanently Connected Appliances
351	422.33 Disconnection of Cord-and-Plug-Connected Appliances 422.34 Unit Switch(es) as Disconnecting Means 422.35 Switch and Circuit Breaker to Be Indicating 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
352	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 422.48 Infrared Lamp Industrial Heating Appliances 422.49 High-Pressure Spray Washers 422.50 Cord-and Plug-Connected Pipe Heating Assemblies 422.51 Vending Machines 422.52 Electric Drinking Fountains V. Marking 422.60 Nameplate
353	422.61 Marking of Heating Elements 422.62 Appliances Consisting of Motors and Other Loads ARTICLE 424 Fixed Electric Space-Heating Equipment I. General 424.1 Scope 424.2 Other Articles 424.3 Branch Circuits 424.6 Listed Equipment II. Installation 424.9 General 424.10 Special Permission 424.11 Supply Conductors 424.12 Locations
354	424.13 Spacing from Combustible Materials III. Control and Protection of Fixed Electric Space-Heating Equipment 424.19 Disconnecting Means 424.20 Thermostatically Controlled Switching Devices
355	424.21 Switch and Circuit Breaker to Be Indicating 424.22 Overcurrent Protection IV. Marking of Heating Equipment 424.28 Nameplate
356	424.29 Marking of Heating Elements 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 424.39 Clearance from Other Objects and Openings 424.40 Splices 424.41 Installation of Heating Cables on Dry Board, in Plaster, and on Concrete Ceilings
357	424.42 Finished Ceilings 424.43 Installation of Nonheating Leads of Cables 424.44 Installation of Cables in Concrete or Poured Masonry Floors. 424.45 Inspection and Tests VI. Duct Heaters 424.57 General 424.58 Identification 424.59 Airflow
358	424.60 Elevated Inlet Temperature 424.61 Installation of Duct Heaters with Heat Pumps and Air Conditioners 424.62 Condensation 424.63 Fan Circuit Interlock 424.64 Limit Controls 424.65 Location of Disconnecting Means 424.66 Installation VII. Resistance-Type Boilers 424.70 Scope 424.71 Identification 424.72 Overcurrent Protection
359	424.73 Overtemperature Limit Control VIII. Electrode-Type Boilers 424.80 Scope 424.81 Identification 424.82 Branch-Circuit Requirements 424.83 Overtemperature Limit Control
360	424.84 Overpressure Limit Control 424.85 Grounding 424.86 Markings IX. Electric Radiant Heating Panels and Heating Panel Sets 424.90 Scope 424.91 Definitions 424.92 Markings 424.93 Installation
361	424.94 Clearances of Wiring in Ceilings 424.95 Location of Branch-Circuit and Feeder Wiring in Walls 424.96 Connection to Branch-Circuit Conductors 424.97 Nonheating Leads 424.98 Installation in Concrete or Poured Masonry 424.99 Installation Under Floor Covering
362	ARTICLE 426 Fixed Outdoor Electric Deicing and Snow-Melting Equipment I. General 426.1 Scope 426.2 Definitions 426.3 Application of Other Articles 426.4 Continuous Load II. Installation 426.10 General 426.11 Use 426.12 Thermal Protection
363	426.13 Identification 426.14 Special Permission III. Resistance Heating Elements 426.20 Embedded Deicing and Snow-Melting Equipment 426.21 Exposed Deicing and Snow-Melting Equipment 426.22 Installation of Nonheating Leads for Embedded Equipment 426.23 Installation of Nonheating Leads for Exposed Equipment 426.24 Electrical Connection
364	426.25 Marking 426.26 Corrosion Protection 426.27 Grounding Braid or Sheath 426.28 Ground-Fault Protection of Equipment IV. Impedance Heating 426.30 Personnel Protection 426.31 Isolation Transformer 426.32 Voltage Limitations 426.33 Induced Currents 426.34 Grounding V. Skin-Effect Heating 426.40 Conductor Ampacity 426.43 Corrosion Protection 426.44 Grounding 426.41 Pull Boxes 426.42 Single Conductor in Enclosure VI. Control and Protection 426.50 Disconnecting Means
365	426.51 Controllers 426.54 Cord-and Plug-Connected Deicing and Snow-Melting Equipment. ARTICLE 427 Fixed Electric Heating Equipment for Pipelines and Vessels I. General 427.1 Scope 427.2 Definitions 427.3 Application of Other Articles 427.4 Continuous Load II. Installation 427.10 General 427.11 Use 427.12 Thermal Protection
366	427.13 Identification III. Resistance Heating Elements 427.14 Secured 427.15 Not in Direct Contact 427.16 Expansion and Contraction 427.17 Flexural Capability 427.18 Power Supply Leads 427.19 Electrical Connections 427.20 Marking 427.22 Ground-Fault Protection of Equipment 427.23 Grounded Conductive Covering IV. Impedance Heating 427.25 Personnel Protection 427.26 Isolation Transformer
367	427.27 Voltage Limitations 427.28 Induced Currents 427.29 Grounding 427.30 Secondary Conductor Sizing V. Induction Heating 427.35 Scope VI. Skin-Effect Heating 427.45 Conductor Ampacity 427.46 Pull Boxes 427.47 Single Conductor in Enclosure 427.48 Grounding VII. Control and Protection 427.55 Disconnecting Means 427.56 Controls
368	427.57 Overcurrent Protection ARTICLE 430 Motors, Motor Circuits, and Controllers I. General 430.1 Scope 430.2 Definitions 430.4 Part-Winding Motors
369	430.5 Other Articles 430.6 Ampacity and Motor Rating Determination
370	430.7 Marking on Motors and Multimotor Equipment
371	430.8 Marking on Controllers 430.9 Terminals 430.10 Wiring Space in Enclosures
372	430.11 Protection Against Liquids 430.12 Motor Terminal Housings
373	430.13 Bushing 430.14 Location of Motors 430.16 Exposure to Dust Accumulations 430.17 Highest Rated or Smallest Rated Motor 430.18 Nominal Voltage of Rectifier Systems II. Motor Circuit Conductors 430.21 General
374	430.22 Single Motor
375	430.23 Wound-Rotor Secondary 430.24 Several Motors or a Motor(s) and Other Load(s) 430.25 Multimotor and Combination-Load Equipment
376	430.26 Feeder Demand Factor 430.27 Capacitors with Motors 430.28 Feeder Taps 430.29 Constant Voltage Direct-Current Motors — Power Resistors III. Motor and Branch-Circuit Overload Protection 430.31 General
377	430.32 Continuous-Duty Motors
378	430.33 Intermittent and Similar Duty 430.35 Shunting During Starting Period 430.36 Fuses — In Which Conductor 430.37 Devices Other Than Fuses — In Which Conductor
379	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 430.43 Automatic Restarting
380	430.44 Orderly Shutdown IV. Motor Branch-Circuit Short-Circuit and Ground-Fault Protection 430.51 General 430.52 Rating or Setting for Individual Motor Circuit
381	430.53 Several Motors or Loads on One Branch Circuit
383	430.54 Multimotor and Combination-Load Equipment 430.55 Combined Overcurrent Protection 430.56 Branch-Circuit Protective Devices — In Which Conductor 430.57 Size of Fuseholder 430.58 Rating of Circuit Breaker V. Motor Feeder Short-Circuit and Ground-Fault Protection 430.61 General 430.62 Rating or Setting — Motor Load 430.63 Rating or Setting — Motor Load and Other Load(s) VI. Motor Control Circuits 430.71 General 430.72 Overcurrent Protection
385	430.73 Protection of Conductors from Physical Damage 430.74 Electrical Arrangement of Control Circuits 430.75 Disconnection VII. Motor Controllers 430.81 General 430.82 Controller Design 430.83 Ratings
386	430.84 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
387	VIII. Motor Control Centers 430.92 General 430.94 Overcurrent Protection 430.95 Service Equipment 430.96 Grounding 430.97 Busbars and Conductors 430.98 Marking IX. Disconnecting Means 430.101 General
388	430.102 Location 430.103 Operation 430.104 To Be Indicating 430.105 Grounded Conductors 430.107 Readily Accessible 430.108 Every Disconnecting Means 430.109 Type
389	430.110 Ampere Rating and Interrupting Capacity
390	430.111 Switch or Circuit Breaker as Both Controller and Disconnecting Means 430.112 Motors Served by Single Disconnecting Means 430.113 Energy from More Than One Source X. Adjustable-Speed Drive Systems 430.120 General
391	430.122 Conductors — Minimum Size and Ampacity 430.124 Overload Protection 430.126 Motor Overtemperature Protection 430.128 Disconnecting Means 430.130 Branch-Circuit Short-Circuit and Ground-Fault Protection for Single Motor Circuits Containing Power Conversion Equipment
392	430.131 Several Motors or Loads on One Branch Circuit Including Power Conversion Equipment XI. Over 1000 Volts, Nominal 430.221 General 430.222 Marking on Controllers 430.224 Size of Conductors 430.225 Motor-Circuit Overcurrent Protection
393	430.226 Rating of Motor Control Apparatus 430.227 Disconnecting Means XII. Protection of Live Parts — All Voltages 430.231 General 430.232 Where Required 430.233 Guards for Attendants XIII. Grounding — All Voltages 430.241 General 430.242 Stationary Motors 430.243 Portable Motors 430.244 Controllers 430.245 Method of Grounding
394	XIV. Tables
396	ARTICLE 440 Air-Conditioning and Refrigerating Equipment I. General 440.1 Scope
397	440.2 Definitions 440.3 Other Articles
398	440.4 Marking on Hermetic Refrigerant Motor-Compressors and Equipment 440.5 Marking on Controllers 440.6 Ampacity and Rating
399	440.7 Highest Rated (Largest) Motor II. Disconnecting Means 440.11 General 440.12 Rating and Interrupting Capacity
400	440.13 Cord-Connected Equipment 440.14 Location III. Branch-Circuit Short-Circuit and Ground-Fault 440.21 General 440.22 Application and Selection
401	IV. Branch-Circuit Conductors 440.31 General 440.32 Single Motor-Compressor 440.33 Motor-Compressor(s) With or Without Additional Motor Loads
402	440.34 Combination Load 440.35 Multimotor and Combination-Load Equipment V. Controllers for Motor-Compressors 440.41 Rating VI. Motor-Compressor and Branch-Circuit Overload Protection 440.51 General 440.52 Application and Selection
403	440.53 Overload Relays 440.54 Motor-Compressors and Equipment on 15- or 20-Ampere Branch Circuits — Not Cord- and Attachment-Plug-Connected 440.55 Cord- and Attachment-Plug-Connected Motor-Compressors and Equipment on 15- or 20-Ampere Branch Circuits VII. Provisions for Room Air Conditioners 440.60 General 440.61 Grounding 440.62 Branch-Circuit Requirements
404	440.63 Disconnecting Means 440.64 Supply Cords 440.65 Leakage-Current Detector-Interrupter (LCDI) and Arc-Fault Circuit Interrupter (AFCI) ARTICLE 445 Generators 445.1 Scope 445.10 Location 445.11 Marking 445.12 Overcurrent Protection
405	445.13 Ampacity of Conductors 445.14 Protection of Live Parts 445.15 Guards for Attendants 445.16 Bushings 445.17 Generator Terminal Housings 445.18 Disconnecting Means Required for Generators 445.20 Ground-Fault Circuit-Interrupter Protection for Receptacles on 15-kW or Smaller Portable Generators ARTICLE 450 Transformers and Transformer Vaults (Including Secondary Ties) 450.1 Scope
406	I. General Provisions 450.2 Definition 450.3 Overcurrent Protection
407	450.4 Autotransformers 1000 Volts, Nominal, or Less 450.5 Grounding Autotransformers
408	450.6 Secondary Ties
409	450.7 Parallel Operation 450.8 Guarding 450.9 Ventilation
410	450.10 Grounding 450.11 Marking 450.12 Terminal Wiring Space 450.13 Accessibility 450.14 Disconnecting Means II. Specific Provisions Applicable to Different Types of Transformers 450.21 Dry-Type Transformers Installed Indoors
411	450.22 Dry-Type Transformers Installed Outdoors 450.23 Less-Flammable Liquid-Insulated Transformers 450.24 Nonflammable Fluid-Insulated Transformers 450.25 Askarel-Insulated Transformers Installed Indoors 450.26 Oil-Insulated Transformers Installed Indoors
412	450.27 Oil-Insulated Transformers Installed Outdoors 450.28 Modification of Transformers III. Transformer Vaults 450.41 Location 450.42 Walls, Roofs, and Floors 450.43 Doorways 450.45 Ventilation Openings
413	450.46 Drainage 450.47 Water Pipes and Accessories 450.48 Storage in Vaults ARTICLE 455 Phase Converters I. General 455.1 Scope 455.2 Definitions 455.3 Other Articles 455.4 Marking 455.5 Equipment Grounding Connection 455.6 Conductors
414	455.7 Overcurrent Protection 455.8 Disconnecting Means 455.9 Connection of Single-Phase Loads 455.10 Terminal Housings 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
415	ARTICLE 460 Capacitors 460.1 Scope 460.2 Enclosing and Guarding I. 1000 Volts, Nominal, and Under 460.6 Discharge of Stored Energy 460.8 Conductors 460.9 Rating or Setting of Motor Overload Device 460.10 Grounding 460.12 Marking II. Over 1000 Volts, Nominal 460.24 Switching
416	460.25 Overcurrent Protection 460.26 Identification 460.27 Grounding 460.28 Means for Discharge ARTICLE 470 Resistors and Reactors I. 1000 Volts, Nominal, and Under 470.1 Scope 470.2 Location 470.3 Space Separation
417	470.4 Conductor Insulation II. Over 1000 Volts, Nominal 470.18 General 470.19 Grounding 470.20 Oil-Filled Reactors ARTICLE 480 Storage Batteries 480.1 Scope 480.2 Definitions
418	480.3 Battery and Cell Terminations 480.4 Wiring and Equipment Supplied from Batteries 480.5 Overcurrent Protection for Prime Movers 480.6 DC Disconnect Methods 480.7 Insulation of Batteries Not Over 250 Volts
419	480.8 Racks and Trays 480.9 Battery Locations 480.10 Vents ARTICLE 490 Equipment Over 1000 Volts, Nominal I. General 490.1 Scope
420	490.2 Definition 490.3 Oil-Filled Equipment II. Equipment — Specific Provisions 490.21 Circuit-Interrupting Devices
422	490.22 Isolating Means 490.23 Voltage Regulators 490.24 Minimum Space Separation 490.25 Backfeed III. Equipment — 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 With in Compartments 490.34 Clearance for Cable Conductors Entering Enclosure 490.35 Accessibility of Energized Parts
423	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
424	490.42 Interlocks — Interrupter Switches 490.43 Stored Energy for Opening 490.44 Fused Interrupter Switches 490.45 Circuit Breakers — Interlocks 490.46 Circuit Breaker Locking 490.47 Switchgear Used as Service Equipment 490.48 Substations
425	IV. Mobile and Portable Equipment 490.51 General 490.52 Overcurrent Protection 490.53 Enclosures
426	490.54 Collector Rings 490.55 Power Cable Connections to Mobile Machines 490.56 High-Voltage Portable Cable for Main Power Supply V. Electrode-Type Boilers 490.70 General 490.71 Electrical Supply System 490.72 Branch-Circuit Requirements 490.73 Pressure and Temperature Limit Control 490.74 Bonding
437	Chapter 5 Special Occupancies ARTICLE 500 Hazardous (Classified) Locations, Classes I, II, and III, Divisions 1 and 2 500.1 Scope — Articles 500 Through 504 500.2 Definitions
438	500.3 Other Articles 500.4 General
439	500.5 Classifications of Locations
442	500.7 Protection Techniques
443	500.8 Equipment
446	ARTICLE 501 Class I Locations I. General 501.1 Scope 501.5 Zone Equipment II. Wiring 501.10 Wiring Methods
447	501.15 Sealing and Drainage
451	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 2 501.35 Surge Protection
452	III. Equipment 501.100 Transformers and Capacitors 501.105 Meters, Instruments, and Relays
453	501.115 Switches, Circuit Breakers, Motor Controllers, and Fuses 501.125 Motors and Generators
454	501.130 Luminaires
455	501.135 Utilization Equipment 501.140 Flexible Cords, Class I, Divisions 1 and 2
456	501.145 Receptacles and Attachment Plugs, Class I, Divisions 1 and 2 501.150 Signaling, Alarm, Remote-Control, and Communications Systems ARTICLE 502 Class II Locations I. General 502.1 Scope 502.5 Explosionproof Equipment 502.6 Zone Equipment
457	II. Wiring 502.10 Wiring Methods
458	502.15 Sealing, Class 502.25 Uninsulated Exposed Parts, Class II, Divisions 1 and 2 502.30 Grounding and Bonding, Class II, Divisions 1 and 2 502.35 Surge Protection — Class II, Divisions 1 and 2 III. Equipment 502.100 Transformers and Capacitors
459	502.115 Switches, Circuit Breakers, Motor Controllers, and Fuses 502.120 Control Transformers and Resistors 502.125 Motors and Generators
460	502.128 Ventilating Piping 502.130 Luminaires
461	502.135 Utilization Equipment 502.140 Flexible Cords — Class II, Divisions 1 and 2 502.145 Receptacles and Attachment Plugs
462	ARTICLE 503 Class III Locations I. General 503.1 Scope 503.5 General 503.6 Zone Equipment II. Wiring 503.10 Wiring Methods
463	503.25 Uninsulated Exposed Parts, Class III, Divisions 1 and 2 503.30 Grounding and Bonding — Class III, Divisions 1 and 2 III. Equipment 503.100 Transformers and Capacitors — Class III, Divisions 1 and 2
464	503.115 Switches, Circuit Breakers, Motor Controllers, and Fuses — Class III, Divisions 1 and 2 503.120 Control Transformers and Resistors — Class III, Divisions 1 and 2 503.125 Motors and Generators — Class III, Divisions 1 and 2 503.128 Ventilating Piping — Class III, Divisions 1 and 2 503.130 Luminaires — Class III, Divisions 1 and 2 503.135 Utilization Equipment — Class III, Divisions 1 and 2 503.140 Flexible Cords — Class III, Divisions 1 and 2
465	503.145 Receptacles and Attachment Plugs — Class III, Divisions 1 and 2 503.150 Signaling, Alarm, Remote-Control, and Local Loudspeaker Intercommunications Systems — Class III, Divisions 1 and 2. 503.155 Electric Cranes, Hoists, and Similar Equipment — Class III, Divisions 1 and 2 503.160 Storage Battery Charging Equipment — Class III, Divisions 1 and 2 ARTICLE 504 Intrinsically Safe Systems 504.1 Scope 504.2 Definitions
466	504.3 Application of Other Articles 504.4 Equipment 504.10 Equipment Installation
467	504.20 Wiring Methods 504.30 Separation of Intrinsically Safe Conductors
468	504.50 Grounding 504.60 Bonding ARTICLE 505 Zone 0, 1, and 2 Locations 505.1 Scope
469	505.2 Definitions
470	505.3 Other Articles 505.4 General
471	505.5 Classifications of Locations
472	505.6 Material Groups 505.7 Special Precaution
473	505.8 Protection Techniques
474	505.9 Equipment
476	505.15 Wiring Methods
478	505.16 Sealing and Drainage
481	505.17 Flexible Cords and Connections
482	505.18 Conductors and Conductor Insulation 505.19 Uninsulated Exposed Parts 505.20 Equipment Requirements
483	505.22 Increased Safety “e” Motors and Generators 505.25 Grounding and Bonding 505.26 Process Sealing
484	ARTICLE 506 Zone 20, 21, and 22 Locations for Combustible Dusts or Ignitible Fibers/Flyings 506.1 Scope 506.2 Definitions
486	506.3 Other Articles 506.4 General 506.5 Classification of Locations
487	506.6 Material Groups 506.7 Special Precaution
488	506.8 Protection Techniques 506.9 Equipment Requirements
491	506.16 Sealing 506.17 Flexible Cords 506.20 Equipment Installation
492	506.25 Grounding and Bonding ARTICLE 510 Hazardous (Classified) Locations — Specific 510.1 Scope 510.2 General ARTICLE 511 Commercial Garages, Repair and Storage 511.1 Scope 511.2 Definitions
493	511.3 Area Classification, General
494	511.4 Wiring and Equipment in Class I Locations 511.7 Wiring and Equipment Installed Above Class I Locations
495	511.9 Sealing 511.10 Special Equipment 511.12 Ground-Fault Circuit-Interrupter Protection for Personnel 511.16 Grounding and Bonding Requirements ARTICLE 513 Aircraft Hangars 513.1 Scope 513.2 Definitions 513.3 Classification of Locations
496	513.4 Wiring and Equipment in Class I Locations 513.7 Wiring and Equipment Not Installed in Class I Locations 513.8 Underground Wiring 513.9 Sealing
497	513.10 Special Equipment
498	513.16 Grounding and Bonding Requirements ARTICLE 514 Motor Fuel Dispensing Facilities 514.1 Scope 514.2 Definition 514.3 Classification of Locations
502	514.4 Wiring and Equipment Installed in Class I Locations 514.7 Wiring and Equipment Above Class I Locations 514.8 Underground Wiring
503	514.9 Sealing 514.11 Circuit Disconnects 514.13 Provisions for Maintenance and Service of Dispensing Equipment ARTICLE 515 Bulk Storage Plants 515.1 Scope 515.3 Class I Locations 515.4 Wiring and Equipment Located in Class I Locations 515.7 Wiring and Equipment Above Class I Locations. (A) Fixed Wiring
507	515.8 Underground Wiring 515.9 Sealing 515.10 Special Equipment — Gasoline Dispensers 515.16 Grounding and Bonding
508	ARTICLE 516 Spray Application, Dipping, Coating, and Printing Processes Using Flammable Combustible Materials 516.1 Scope 516.2 Definitions 516.3 Classification of Locations
513	516.4 Wiring and Equipment in Class I Locations
515	516.7 Wiring and Equipment Not Within Classified Locations 516.10 Special Equipment
517	ARTICLE 517 Health Care Facilities I. General 517.1 Scope 517.2 Definitions
520	517.4 [OSHPD 1, 2 & 4] II. Wiring and Protection 517.10 Applicability 517.10.1 [OSHPD 1, 2, 3, & 4] Applicability 517.11 General Installation — Construction Criteria 517.12 Wiring Methods 517.13 Grounding of Receptacles and Fixed Electrical Equipment in Patient Care Areas
521	517.14 Panelboard Bonding 517.16 Use of Isolated Ground Receptacles 517.17 Ground-Fault Protection 517.18 General Care Areas
522	517.19 Critical Care Areas
523	517.20 Wet Procedure Locations 517.21 Ground-Fault Circuit-Interrupter Protection for Personnel 517.22 [OSHPD 1, 2, 3 & 4] Artificial Lighting 517.24 [OSHPD 1, 2, 3, & 4] Mobile Medical Facilities III. Essential Electrical System 517.25 Scope
524	517.26 Application of Other Articles 517.30 Essential Electrical Systems for Hospitals
526	517.31 Branches Requiring Automatic Connection 517.32 Life Safety Branch 517.33 Critical Branch
527	517.34 Equipment Branch Connection to Alternate Power Source
528	517.35 Sources of Power 517.40 Essential Electrical Systems for Nursing Homes and Limited Care Facilities 517.41 Essential Electrical Systems
529	517.42 Automatic Connection to Life Safety Branch
530	517.43 Connection to Critical Branch 517.44 Sources of Power
531	517.45 Essential Electrical Systems for Other Health Care Facilities IV. Inhalation Anesthetizing Locations 517.60 Anesthetizing Location Classification 517.61 Wiring and Equipment
532	517.62 Grounding 517.63 Grounded Power Systems in Anesthetizing Locations
533	517.64 Low-Voltage Equipment and Instruments V. X-Ray Installations 517.70 Applicability 517.71 Connection to Supply Circuit
534	517.72 Disconnecting Means 517.73 Rating of Supply Conductors and Overcurrent Protection 517.74 Control Circuit Conductors 517.75 Equipment Installations 517.76 Transformers and Capacitors 517.77 Installation of High-Tension X-Ray Cables 517.78 Guarding and Grounding VI. Communications, Signaling Systems, Data Systems, Fire Alarm Systems, and Systems Less Than 120 Volts, Nominal
535	517.80 Patient Care Area 517.81 Other-Than-Patient-Care Areas 517.82 Signal Transmission Between Appliances 517.123 [OSHPD 1, 2, 3, & 4] Call Systems
536	VII. Isolated Power Systems 517.160 Isolated Power Systems
537	ARTICLE 518 Assembly Occupancies 518.1 Scope 518.2 General Classification 518.3 Other Articles 518.4 Wiring Methods
538	518.5 Supply ARTICLE 520 Theaters, Audience Areas of Motion Picture and Television Studios, Performance Areas, and Similar Locations I. General 520.1 Scope 520.2 Definitions
539	520.3 Motion Picture Projectors 520.4 Audio Signal Processing, Amplification, and Reproduction Equipment. 520.5 Wiring Methods 520.6 Number of Conductors in Raceway 520.7 Enclosing and Guarding Live Parts 520.8 Emergency Systems 520.9 Branch Circuits 520.10 Portable Equipment Used Outdoors II. Fixed Stage Switchboards 520.21 General 520.25 Dimmers
540	520.26 Type of Switchboard 520.27 Stage Switchboard Feeders III. Fixed Stage Equipment Other Than Switchboards 520.40 Stage Lighting Hoists 520.42 Conductor Insulation 520.43 Footlights
541	520.44 Borders, Proscenium Sidelights, Drop Boxes, and Connector Strips 520.45 Receptacles 520.46 Connector Strips, Drop Boxes, Floor Pockets, and Other Outlet Enclosures 520.47 Backstage Lamps (Bare Bulbs)
542	520.48 Curtain Machines 520.49 Smoke Ventilator Control IV. Portable Switchboards on Stage 520.50 Road Show Connection Panel (A Type of Patch Panel) 520.51 Supply 520.52 Overcurrent Protection for Branch Circuits 520.53 Construction and Feeders
544	V. Portable Stage Equipment Other Than Switchboards 520.61 Arc Lamps 520.62 Portable Power Distribution Units
545	520.63 Bracket Fixture Wiring 520.64 Portable Strips 520.65 Festoons 520.66 Special Effects 520.67 Multipole Branch-Circuit Cable Connectors 520.68 Conductors for Portables
546	520.69 Adapters VI. Dressing Rooms 520.71 Pendant Lampholders 520.72 Lamp Guards 520.73 Switches Required VII. Grounding 520.81 Grounding ARTICLE 522 Control Systems for Permanent Amusement Attractions I. General 522.1 Scope 522.2 Definitions
547	522.5 Voltage Limitations 522.7 Maintenance II. Control Circuits 522.10 Power Sources for Control Circuits III. Control Circuit Wiring Methods 522.20 Conductors, Busbars, and Slip Rings 522.21 Conductor Sizing 522.22 Conductor Ampacity 522.23 Overcurrent Protection for Conductors 522.24 Conductors of Different Circuits in the Same Cable, Cable Tray, Enclosure, or Raceway
548	522.25 Ungrounded Control Circuits 522.28 Control Circuits in Wet Locations ARTICLE 525 Carnivals, Circuses, Fairs, and Similar Events I. General Requirements 525.1 Scope 525.2 Definitions 525.3 Other Articles
549	525.5 Overhead Conductor Clearances 525.6 Protection of Electrical Equipment II. Power Sources 525.10 Services 525.11 Multiple Sources of Supply III. Wiring Methods 525.20 Wiring Methods 525.21 Rides, Tents, and Concessions
550	525.22 Portable Distribution or Termination Boxes 525.23 Ground-Fault Circuit-Interrupter (GFCI) Protection IV. Grounding and Bonding 525.30 Equipment Bonding 525.31 Equipment Grounding 525.32 Equipment Grounding Conductor Continuity Assurance ARTICLE 530 Motion Picture and Television Studios and Similar Locations I. General 530.1 Scope 530.2 Definitions
551	530.6 Portable Equipment II. Stage or Set 530.11 Permanent Wiring 530.12 Portable Wiring 530.13 Stage Lighting and Effects Control
552	530.14 Plugging Boxes 530.15 Enclosing and Guarding Live Parts 530.16 Portable Luminaires 530.17 Portable Arc Lamps 530.18 Overcurrent Protection — General
553	530.19 Sizing of Feeder Conductors for Television Studio Sets 530.20 Grounding 530.21 Plugs and Receptacles 530.22 Single-Pole Separable Connectors 530.23 Branch Circuits III. Dressing Rooms 530.31 Dressing Rooms
554	IV. Viewing, Cutting, and Patching Tables 530.41 Lamps at Tables 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 VI. Substations 530.61 Substations 530.62 Portable Substations 530.63 Overcurrent Protection of Direct-Current Generators 530.64 Direct-Current Switchboards ARTICLE 540 Motion Picture Projection Rooms I. General 540.1 Scope 540.2 Definitions II. Equipment and Projectors of the Professional Type 540.10 Motion Picture Projection Room Required 540.11 Location of Associated Electrical Equipment
555	540.12 Work Space 540.13 Conductor Size 540.14 Conductors on Lamps and Hot Equipment 540.15 Flexible Cords 540.20 Listing Requirements 540.21 Marking III. Nonprofessional Projectors 540.31 Motion Picture Projection Room Not Required 540.32 Listing Requirements IV. Audio Signal Processing, Amplification, and Reproduction Equipment 540.50 Audio Signal Processing, Amplification, and Reproduction Equipment
556	ARTICLE 545 Manufactured Buildings 545.1 Scope 545.2 Definitions 545.4 Wiring Methods 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 545.10 Receptacle or Switch with Integral Enclosure 545.11 Bonding and Grounding 545.12 Grounding Electrode Conductor 545.13 Component Interconnections
557	ARTICLE 547 Agricultural Buildings 547.1 Scope 547.2 Definitions 547.3 Other Articles 547.4 Surface Temperatures 547.5 Wiring Methods
558	547.6 Switches, Receptacles, Circuit Breakers, Controllers, and Fuses 547.7 Motors 547.8 Luminaires 547.9 Electrical Supply to Building(s) or Structure(s) from a Distribution Point
559	547.10 Equipotential Planes and Bonding of Equipotential Planes ARTICLE 550 Mobile Homes, Manufactured Homes, and Mobile Home Parks I. General 550.1 Scope 550.2 Definitions
560	550.4 General Requirements II. Mobile and Manufactured Homes 550.10 Power Supply
561	550.11 Disconnecting Means and Branch-Circuit Protective Equipment
562	550.12 Branch Circuits
563	550.13 Receptacle Outlets
564	550.14 Luminaires and Appliances 550.15 Wiring Methods and Materials
565	550.16 Grounding
566	550.17 Testing 550.18 Calculations
567	550.19 Interconnection of Multiple-Section Mobile or Manufactured Home Units 550.20 Outdoor Outlets, Luminaires, Air-Cooling Equipment, and So Forth 550.25 Arc-Fault Circuit-Interrupter Protection III. Services and Feeders 550.30 Distribution System 550.31 Allowable Demand Factors 550.32 Service Equipment
568	550.33 Feeder
569	ARTICLE 551 Recreational Vehicles and Recreational Vehicle Parks I. General 551.1 Scope 551.2 Definitions
570	551.4 General Requirements II. Combination Electrical Systems 551.20 Combination Electrical Systems III. Other Power Sources 551.30 Generator Installations
571	551.31 Multiple Supply Source 551.32 Other Sources 551.33 Alternate Source Restrictions IV. Nominal 120-Volt or 120/240-Volt Systems 551.40 120-Volt or 120/240-Volt, Nominal, Systems
572	551.41 Receptacle Outlets Required 551.42 Branch Circuits Required
573	551.43 Branch-Circuit Protection 551.44 Power-Supply Assembly 551.45 Panelboard 551.46 Means for Connecting to Power Supply
575	551.47 Wiring Methods
577	551.48 Conductors and Boxes 551.49 Grounded Conductors 551.50 Connection of Terminals and Splices 551.51 Switches 551.52 Receptacles 551.53 Luminaires and Other Equipment 551.54 Grounding
578	551.55 Interior Equipment Grounding 551.56 Bonding of Non—Current-Carrying Metal Parts
579	551.57 Appliance Accessibility and Fastening V. Factory Tests 551.60 Factory Tests (Electrical) VI. Recreational Vehicle Parks 551.71 Type Receptacles Provided 551.72 Distribution System 551.73 Calculated Load
580	551.74 Overcurrent Protection 551.75 Grounding 551.76 Grounding — Recreational Vehicle Site Supply Equipment 551.77 Recreational Vehicle Site Supply Equipment
581	551.78 Protection of Outdoor Equipment 551.79 Clearance for Overhead Conductors 551.80 Underground Service, Feeder, Branch-Circuit, and Recreational Vehicle Site Feeder-Circuit Conductors 551.81 Receptacles ARTICLE 552 Park Trailers I. General 552.1 Scope 552.2 Definition 552.4 General Requirements
582	II. Low-Voltage Systems 552.10 Low-Voltage Systems
583	III. Combination Electrical Systems 552.20 Combination Electrical Systems IV. Nominal 120-Volt or 120/240-Volt Systems 552.40 120-Volt or 120/240-Volt, Nominal, Systems
584	552.41 Receptacle Outlets Required 552.43 Power Supply
585	552.44 Cord
586	552.45 Panelboard 552.46 Branch Circuits 552.47 Calculations
587	552.48 Wiring Methods
588	552.49 Maximum Number of Conductors in Boxes 552.50 Grounded Conductors 552.51 Connection of Terminals and Splices 552.52 Switches
589	552.53 Receptacles 552.54 Luminaires 552.55 Grounding 552.56 Interior Equipment Grounding 552.57 Bonding of Non—Current-Carrying Metal Parts
590	552.58 Appliance Accessibility and Fastening 552.59 Outdoor Outlets, Fixtures, Including Luminaires, Air-Cooling Equipment, and So On V. Factory Tests 552.60 Factory Tests (Electrical) ARTICLE 553 Floating Buildings I. General 553.1 Scope
591	553.2 Definition II. Services and Feeders 553.4 Location of Service Equipment 553.5 Service Conductors 553.6 Feeder Conductors 553.7 Installation of Services and Feeders III. Grounding 553.8 General Requirements 553.9 Insulated Neutral 553.10 Equipment Grounding 553.11 Bonding of Non—Current-Carrying Metal Parts ARTICLE 555 Marinas and Boatyards 555.1 Scope
592	555.2 Definitions 555.3 Ground-Fault Protection 555.4 Distribution System 555.5 Transformers 555.7 Location of Service Equipment 555.9 Electrical Connections 555.10 Electrical Equipment Enclosures 555.11 Circuit Breakers, Switches, Panelboards, and Marine Power Outlets 555.12 Load Calculations for Service and Feeder Conductors 555.13 Wiring Methods and Installation
593	555.15 Grounding
594	555.17 Disconnecting Means for Shore Power Connection(s). 555.19 Receptacles 555.21 Motor Fuel Dispensing Stations — Hazardous (Classified) Locations 555.22 Repair Facilities — Hazardous (Classified) Locations.
595	555.23 Marine Hoists, Railways, Cranes, and Monorails ARTICLE 590 Temporary Installations 590.1 Scope 590.2 All Wiring Installations 590.3 Time Constraints 590.4 General
596	590.5 Listing of Decorative Lighting 590.6 Ground-Fault Protection for Personnel
597	590.7 Guarding
604	Chapter 6 Special Equipment ARTICLE 600 Electric Signs and Outline Lighting I. General 600.1 Scope 600.2 Definitions 600.3 Listing 600.4 Markings 600.5 Branch Circuits
605	600.6 Disconnects 600.7 Grounding and Bonding
606	600.8 Enclosures 600.9 Location
607	600.10 Portable or Mobile Signs 600.12 Field-Installed Secondary Wiring 600.21 Ballasts, Transformers, Electronic Power Supplies, and Class 2 Power Sources. 600.22 Ballasts 600.23 Transformers and Electronic Power Supplies
608	600.24 Class 2 Power Sources II. Field-Installed Skeleton Tubing, Outline Lighting, and Secondary Wiring 600.30 Applicability 600.31 Neon Secondary-Circuit Wiring, 1000 Volts or Less, Nominal 600.32 Neon Secondary-Circuit Wiring, over 1000 Volts, Nominal
609	600.33 LED Sign Illumination Systems, Secondary Wiring 600.41 Neon Tubing 600.42 Electrode Connections
610	ARTICLE 604 Manufactured Wiring Systems 604.1 Scope 604.2 Definition 604.4 Uses Permitted 604.5 Uses Not Permitted 604.6 Construction
611	604.7 Installation ARTICLE 605 Office Furnishings 605.1 Scope 605.2 Definition 605.3 General 605.4 Wireways 605.5 Office Furnishing Interconnections
612	605.6 Lighting Accessories 605.7 Fixed-Type Office Furnishings 605.8 Freestanding-Type Office Furnishings 605.9 Freestanding-Type Office Furnishings, Cord- and Plug-Connected ARTICLE 610 Cranes and Hoists I. General 610.1 Scope 610.2 Definition 610.3 Special Requirements for Particular Locations
613	II. Wiring 610.11 Wiring Method 610.12 Raceway or Cable Terminal Fittings 610.13 Types of Conductors 610.14 Rating and Size of Conductors
615	610.15 Common Return III. Contact Conductors 610.21 Installation of Contact Conductors
616	610.22 Collectors IV. Disconnecting Means 610.31 Runway Conductor Disconnecting Means 610.32 Disconnecting Means for Cranes and Monorail Hoists 610.33 Rating of Disconnecting Means V. Overcurrent Protection 610.41 Feeders, Runway Conductors
617	610.42 Branch-Circuit Short-Circuit and Ground-Fault Protection 610.43 Overload Protection VI. Control 610.51 Separate Controllers 610.53 Overcurrent Protection 610.55 Limit Switch 610.57 Clearance
618	VII. Grounding 610.61 Grounding ARTICLE 620 Elevators, Dumbwaiters, Escalators, Moving Walks, Platform Lifts, and Stairway Chairlifts I. General 620.1 Scope 620.2 Definitions
619	620.3 Voltage Limitations 620.4 Live Parts Enclosed 620.5 Working Clearances
620	II. Conductors 620.11 Insulation of Conductors 620.12 Minimum Size of Conductors 620.13 Feeder and Branch-Circuit Conductors
621	620.14 Feeder Demand Factor 620.15 Motor Controller Rating III. Wiring 620.21 Wiring Methods
623	620.22 Branch Circuits for Car Lighting, Receptacle(s), Ventilation, Heating, and Air-Conditioning 620.23 Branch Circuits for Machine Room or Control Room/Machinery Space or Control Space Lighting and Receptacle(s) 620.24 Branch Circuit for Hoistway Pit Lighting and Receptacle(s)
624	620.25 Branch Circuits for Other Utilization Equipment 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 620.38 Electrical Equipment in Garages and Similar Occupancies V. Traveling Cables 620.41 Suspension of Traveling Cables
625	620.42 Hazardous (Classified) Locations 620.43 Location of and Protection for Cables 620.44 Installation of Traveling Cables VI. Disconnecting Means and Control 620.51 Disconnecting Means
626	620.52 Power from More Than One Source 620.53 Car Light, Receptacle(s), and Ventilation Disconnecting Means 620.54 Heating and Air-Conditioning Disconnecting Means
627	620.55 Utilization Equipment Disconnecting Means VII. Overcurrent Protection 620.61 Overcurrent Protection 620.62 Selective Coordination VIII. Machine Rooms, Control Rooms, Machinery Spaces, and Control Spaces 620.71 Guarding Equipment IX. Grounding 620.81 Metal Raceways Attached to Cars 620.82 Electric Elevators
628	620.83 Nonelectric Elevators 620.84 Escalators, Moving Walks, Platform Lifts, and Stairway Chairlifts 620.85 Ground-Fault Circuit-Interrupter Protection for Personnel X. Emergency and Standby Power Systems 620.91 Emergency and Standby Power Systems ARTICLE 625 Electric Vehicle Charging System I. General 625.1 Scope 625.1.1 [HCD 1][BSC-CG] Electric Vehicle (EV) Charging for New Construction 625.2 Definitions
629	625.4 Voltages 625.5 Listed II. Equipment Construction 625.10 Electric Vehicle Coupler 625.15 Markings
630	625.16 Means of Coupling 625.17 Cords and Cables 625.18 Interlock 625.19 Automatic De-Energization of Cable 625.22 Personnel Protection System III. Installation 625.40 Overcurrent Protection
631	625.41 Rating 625.42 Disconnecting Means 625.44 Electric Vehicle Supply Equipment Connection 625.46 Loss of Primary Source 625.48 Interactive Systems 625.50 Location 625.52 Ventilation
632	ARTICLE 626 Electrified Truck Parking Spaces I. General 626.1 Scope 626.2 Definitions
634	626.3 Other Articles 626.4 General Requirements II. Electrified Truck Parking Space Electrical Wiring Systems 626.10 Branch Circuits 626.11 Feeder and Service Load Calculations III. Electrified Truck Parking Space Supply Equipment 626.22 Wiring Methods and Materials
635	626.23 Overhead Gantry or Cable Management System 626.24 Electrified Truck Parking Space Supply Equipment Connection Means
636	626.25 Separable Power-Supply Cable Assembly
637	626.26 Loss of Primary Power 626.27 Interactive Systems IV. Transport Refrigerated Units (TRUs) 626.30 Transport Refrigerated Units 626.31 Disconnecting Means and Receptacles 626.32 Separable Power Supply Cable Assembly
638	ARTICLE 630 Electric Welders I. General 630.1 Scope II. Arc Welders 630.11 Ampacity of Supply Conductors 630.12 Overcurrent Protection
639	630.13 Disconnecting Means 630.14 Marking 630.15 Grounding of Welder Secondary Circuit III. Resistance Welders 630.31 Ampacity of Supply Conductors 630.32 Overcurrent Protection
640	630.33 Disconnecting Means 630.34 Marking IV. Welding Cable 630.41 Conductors 630.42 Installation ARTICLE 640 Audio Signal Processing, Amplification, and Reproduction Equipment I. General 640.1 Scope 640.2 Definitions
641	640.3 Locations and Other Articles
642	640.4 Protection of Electrical Equipment 640.5 Access to Electrical Equipment Behind Panels Designed to Allow Access 640.6 Mechanical Execution of Work 640.7 Grounding. 640.8 Grouping of Conductors 640.9 Wiring Methods
643	640.10 Audio Systems Near Bodies of Water II. Permanent Audio System Installations 640.21 Use of Flexible Cords and Cables
644	640.22 Wiring of Equipment Racks and Enclosures 640.23 Conduit or Tubing 640.24 Wireways, Gutters, and Auxiliary Gutters 640.25 Loudspeaker Installation in Fire Resistance-Rated Partitions, Walls, and Ceilings III. Portable and Temporary Audio System Installations 640.41 Multipole Branch-Circuit Cable Connectors 640.42 Use of Flexible Cords and Cables
645	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
646	645.3 Other Articles 645.4 Special Requirements for Information Technology Equipment Room 645.5 Supply Circuits and Interconnecting Cables
648	645.6 Cables Not in Information Technology Equipment Room 645.10 Disconnecting Means 645.11 Uninterruptible Power Supplies (UPSs) 645.14 System Grounding 645.15 Equipment Grounding and Bonding 645.16 Marking
649	645.17 Power Distribution Units 645.25 Engineering Supervision 645.27 Selective Coordination ARTICLE 646 Modular Data Centers I. General 646.1 Scope 646.2 Definitions 646.3 Other Articles
650	646.4 Applicable Requirements 646.5 Nameplate Data
651	646.6 Supply Conductors and Overcurrent Protection 646.7 Short-Circuit Current Rating 646.8 Field-Wiring Compartments 646.9 Flexible Power Cords and Cables for Connecting Equipment Enclosures of an MDC System
652	II. Equipment 646.10 Electrical Supply and Distribution 646.11 Distribution Transformers 646.12 Receptacles 646.13 Other Electrical Equipment 646.14 Installation and Use III. Lighting 646.15 General Illumination 646.16 Emergency Lighting 646.17 Emergency Lighting Circuits IV. Workspace 646.18 General 646.19 Entrance to and Egress from Working Space
653	646.20 Working Space for ITE 646.21 Work Areas and Working Space Around Batteries 646.22 Workspace for Routine Service and Maintenance ARTICLE 647 Sensitive Electronic Equipment 647.1 Scope 647.3 General 647.4 Wiring Methods
654	647.5 Three-Phase Systems 647.6 Grounding 647.7 Receptacles 647.8 Lighting Equipment ARTICLE 650 Pipe Organs 650.1 Scope 650.3 Other Articles
655	650.4 Source of Energy 650.5 Grounding 650.6 Conductors 650.7 Installation of Conductors 650.8 Overcurrent Protection ARTICLE 660 X-Ray Equipment I. General 660.1 Scope 660.2 Definitions 660.3 Hazardous (Classified) Locations 660.4 Connection to Supply Circuit
656	660.5 Disconnecting Means 660.6 Rating of Supply Conductors and Overcurrent Protection 660.7 Wiring Terminals 660.9 Minimum Size of Conductors 660.10 Equipment Installations II. Control 660.20 Fixed and Stationary Equipment 660.21 Portable and Mobile Equipment 660.23 Industrial and Commercial Laboratory Equipment 660.24 Independent Control
657	III. Transformers and Capacitors 660.35 General 660.36 Capacitors IV. Guarding and Grounding 660.47 General 660.48 Grounding ARTICLE 665 Induction and Dielectric Heating Equipment I. General 665.1 Scope 665.2 Definitions 665.4 Hazardous (Classified) Locations 665.5 Output Circuit 665.7 Remote Control 665.10 Ampacity of Supply Conductors
658	665.11 Overcurrent Protection 665.12 Disconnecting Means II. Guarding, Grounding, and Labeling 665.19 Component Interconnection 665.20 Enclosures 665.21 Control Panels 665.22 Access to Internal Equipment 665.23 Warning Labels or Signs 665.24 Capacitors 665.25 Dielectric Heating Applicator Shielding 665.26 Grounding and Bonding 665.27 Marking
659	ARTICLE 668 Electrolytic Cells 668.1 Scope 668.2 Definitions 668.3 Other Articles 668.10 Cell Line Working Zone
660	668.11 Direct-Current Cell Line Process Power Supply 668.12 Cell Line Conductors 668.13 Disconnecting Means 668.14 Shunting Means 668.15 Grounding 668.20 Portable Electrical Equipment 668.21 Power-Supply Circuits and Receptacles for Portable Electrical Equipment
661	668.30 Fixed and Portable Electrical Equipment 668.31 Auxiliary Nonelectrical Connections 668.32 Cranes and Hoists 668.40 Enclosures ARTICLE 669 Electroplating 669.1 Scope 669.3 General 669.5 Branch-Circuit Conductors 669.6 Wiring Methods
662	669.7 Warning Signs 669.8 Disconnecting Means 669.9 Overcurrent Protection ARTICLE 670 Industrial Machinery 670.1 Scope 670.2 Definition 670.3 Machine Nameplate Data 670.4 Supply Conductors and Overcurrent Protection
663	670.5 Short-Circuit Current Rating ARTICLE 675 Electrically Driven or Controlled Irrigation Machines I. General 675.1 Scope 675.2 Definitions 675.4 Irrigation Cable 675.5 More Than Three Conductors in a Raceway or Cable 675.6 Marking on Main Control Panel
664	675.7 Equivalent Current Ratings 675.8 Disconnecting Means 675.9 Branch-Circuit Conductors 675.10 Several Motors on One Branch Circuit 675.11 Collector Rings
665	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 II. Center Pivot Irrigation Machines 675.21 General 675.22 Equivalent Current Ratings ARTICLE 680 Swimming Pools, Fountains, and Similar Installations I. General 680.1 Scope 680.2 Definitions
666	680.3 Other Articles
667	680.4 Approval of Equipment 680.5 Ground-Fault Circuit Interrupters 680.6 Grounding 680.7 Cord-and-Plug-Connected Equipment 680.8 Overhead Conductor Clearances 680.9 Electric Pool Water Heaters
668	680.10 Underground Wiring Location 680.11 Equipment Rooms and Pits 680.12 Maintenance Disconnecting Means 680.13 Gas Chlorination Equipment Rooms [DPH] 680.14 Emergency Switch for Spa Pools. [DPH] II. Permanently Installed Pools 680.20 General
669	680.21 Motors 680.22 Lighting, Receptacles, and Equipment
670	680.23 Underwater Luminaires
672	680.24 Junction Boxes and Electrical Enclosures for Transformers or Ground-Fault Circuit Interrupters
673	680.25 Feeders 680.26 Equipotential Bonding
675	680.27 Specialized Pool Equipment III. Storable Pools, Storable Spas, and Storable Hot Tubs 680.30 General 680.31 Pumps 680.32 Ground-Fault Circuit Interrupters Required
676	680.33 Luminaires 680.34 Receptacle Locations IV. Spas and Hot Tubs 680.40 General 680.41 Emergency Switch for Spas and Hot Tubs 680.42 Outdoor Installations
677	680.43 Indoor Installations
678	680.44 Protection V. Fountains 680.50 General 680.51 Luminaires, Submersible Pumps, and Other Submersible Equipment 680.52 Junction Boxes and Other Enclosures
679	680.53 Bonding 680.54 Grounding 680.55 Methods of Grounding 680.56 Cord-and-Plug-Connected Equipment 680.57 Signs
680	680.58 GFCI Protection for Adjacent Receptacle Outlets VI. Pools and Tubs for Therapeutic Use 680.60 General 680.61 Permanently Installed Therapeutic Pools 680.62 Therapeutic Tubs (Hydrotherapeutic Tanks) VII. Hydromassage Bathtubs 680.70 General
681	680.71 Protection 680.72 Other Electrical Equipment 680.73 Accessibility 680.74 Bonding ARTICLE 682 Natural and Artificially Made Bodies of Water I. General 682.1 Scope 682.2 Definitions 682.3 Other Articles
682	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) 682.15 Ground-Fault Circuit-Interrupter (GFCI) Protection III. Grounding and Bonding 682.30 Grounding 682.31 Equipment Grounding Conductors 682.32 Bonding of Non—Current-Carrying Metal Parts 682.33 Equipotential Planes and Bonding of Equipotential Planes
683	ARTICLE 685 Integrated Electrical Systems I. General 685.1 Scope 685.3 Application of Other Articles II. Orderly Shutdown 685.10 Location of Overcurrent Devices in or on Premises 685.12 Direct-Current System Grounding 685.14 Ungrounded Control Circuits
684	ARTICLE 690 Solar Photovoltaic (PV) Systems I. General 690.1 Scope 690.2 Definitions
685	690.3 Other Articles 690.4 General Requirements
686	690.5 Ground-Fault Protection 690.6 Alternating-Current (ac) Modules II. Circuit Requirements 690.7 Maximum Voltage
687	690.8 Circuit Sizing and Current
688	690.9 Overcurrent Protection 690.10 Stand-Alone Systems
689	690.11 Arc-Fault Circuit Protection (Direct Current) 690.12 Rapid Shutdown of PV Systems on Buildings III. Disconnecting Means 690.13 Building or Other Structure Supplied by a Photovoltaic System 690.15 Disconnection of Photovoltaic Equipment
690	690.16 Fuses 690.17 Disconnect Type
691	690.18 Installation and Service of an Array IV. Wiring Methods 690.31 Methods Permitted
693	690.32 Component Interconnections 690.33 Connectors 690.34 Access to Boxes 690.35 Ungrounded Photovoltaic Power Systems
694	V. Grounding 690.41 System Grounding 690.42 Point of System Grounding Connection 690.43 Equipment Grounding 690.45 Size of Equipment Grounding Conductors
695	690.46 Array Equipment Grounding Conductors 690.47 Grounding Electrode System
696	690.48 Continuity of Equipment Grounding Systems 690.49 Continuity of Photovoltaic Source and Output Circuit Grounded Conductors 690.50 Equipment Bonding Jumpers VI. Marking 690.51 Modules 690.52 Alternating-Current Photovoltaic Modules 690.53 Direct-Current Photovoltaic Power Source 690.54 Interactive System Point of Interconnection 690.55 Photovoltaic Power Systems Employing Energy Storage 690.56 Identification of Power Sources
697	VII. Connection to Other Sources 690.57 Load Disconnect 690.60 Identified Interactive Equipment 690.61 Loss of Interactive System Power 690.63 Unbalanced Interconnections 690.64 Point of Connection VIII. Storage Batteries 690.71 Installation
698	690.72 Charge Control 690.74 Battery Interconnections
699	IX. Systems over 1000 Volts 690.80 General 690.81 Listing 690.85 Definitions X. Electric Vehicle Charging 690.90 General 690.91 Charging Equipment ARTICLE 692 Fuel Cell Systems I. General 692.1 Scope 692.2 Definitions 692.3 Other Articles 692.4 Installation
700	692.6 Listing Requirement II. Circuit Requirements 692.8 Circuit Sizing and Current 692.9 Overcurrent Protection 692.10 Stand-Alone Systems III. Disconnecting Means 692.13 All Conductors 692.17 Switch or Circuit Breaker IV. Wiring Methods 692.31 Wiring Systems
701	V. Grounding 692.41 System Grounding 692.44 Equipment Grounding Conductor 692.45 Size of Equipment Grounding Conductor 692.47 Grounding Electrode System VI. Marking 692.53 Fuel Cell Power Sources 692.54 Fuel Shut-Off 692.56 Stored Energy 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 VIII. Outputs over 1000 Volts 692.80 General ARTICLE 694 Wind Electric Systems I. General 694.1 Scope
702	694.2 Definitions 694.3 Other Articles. 694.7 Installation
703	II. Circuit Requirements 694.10 Maximum Voltage 694.12 Circuit Sizing and Current 694.15 Overcurrent Protection
704	694.18 Stand-Alone Systems III. Disconnecting Means 694.20 All Conductors 694.22 Additional Provisions
705	694.23 Turbine Shutdown 694.24 Disconnection of Wind Electric System Equipment. 694.26 Fuses 694.28 Installation and Service of a Wind Turbine IV. Wiring Methods 694.30 Permitted Methods V. Grounding 694.40 Equipment Grounding
706	VI. Marking 694.50 Interactive System Point of Interconnection 694.52 Power Systems Employing Energy Storage 694.54 Identification of Power Sources 694.56 Instructions for Disabling Turbine VII. Connection to Other Sources 694.60 Identified Interactive Equipment 694.62 Installation 694.66 Operating Voltage Range 694.68 Point of Connection VIII. Systems over 1000 Volts 694.80 General 694.85 Cable and Equipment Ratings
707	ARTICLE 695 Fire Pumps 695.1 Scope 695.2 Definitions 695.3 Power Source(s) for Electric Motor-Driven Fire Pumps
708	695.4 Continuity of Power
709	695.5 Transformers
710	695.6 Power Wiring
711	695.7 Voltage Drop 695.10 Listed Equipment 695.12 Equipment Location
712	695.14 Control Wiring
717	Chapter 7 Special Conditions ARTICLE 700 Emergency Systems I. General 700.1 Scope 700.2 Definitions 700.3 Tests and Maintenance 700.4 Capacity
718	700.5 Transfer Equipment 700.6 Signals 700.7 Signs 700.8 Surge Protection II. Circuit Wiring 700.10 Wiring, Emergency System
719	III. Sources of Power 700.12 General Requirements
721	IV. Emergency System Circuits for Lighting and Power 700.15 Loads on Emergency Branch Circuits 700.16 Emergency Illumination 700.17 Branch Circuits for Emergency Lighting
722	700.18 Circuits for Emergency Power 700.19 Multiwire Branch Circuits V. Control — 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 Luminaires 700.25 Automatic Load Control Relay VI. Overcurrent Protection 700.26 Accessibility 700.27 Ground-Fault Protection of Equipment 700.28 Selective Coordination ARTICLE 701 Legally Required Standby Systems I. General 701.1 Scope
723	701.2 Definition 701.3 Tests and Maintenance 701.4 Capacity and Rating 701.5 Transfer Equipment 701.6 Signals
724	701.7 Signs II. Circuit Wiring 701.10 Wiring Legally Required Standby Systems III. Sources of Power 701.12 General Requirements
725	IV. Overcurrent Protection 701.25 Accessibility 701.26 Ground-Fault Protection of Equipment
726	ARTICLE 702 Optional Standby Systems I. General 702.1 Scope 702.2 Definition 702.4 Capacity and Rating 702.5 Transfer Equipment 702.6 Signals
727	702.7 Signs II. Wiring 702.10 Wiring Optional Standby Systems 702.11 Portable Generator Grounding 702.12 Outdoor Generator Sets ARTICLE 705 Interconnected Electric Power Production Sources I. General 705.1 Scope 705.2 Definitions
728	705.3 Other Articles 705.4 Equipment Approval 705.6 System Installation 705.10 Directory 705.12 Point of Connection
729	705.14 Output Characteristics 705.16 Interrupting and Short-Circuit Current Rating 705.20 Disconnecting Means, Sources 705.21 Disconnecting Means, Equipment 705.22 Disconnect Device 705.30 Overcurrent Protection
730	705.31 Location of Overcurrent Protection 705.32 Ground-Fault Protection 705.40 Loss of Primary Source 705.42 Loss of 3-Phase Primary Source 705.50 Grounding II. Utility-Interactive Inverters 705.60 Circuit Sizing and Current
731	705.65 Overcurrent Protection 705.70 Utility-Interactive Inverters Mounted in Not-Readily-Accessible Locations. 705.80 Utility-Interactive Power Systems Employing Energy Storage 705.100 Unbalanced Interconnections
732	III. Generators 705.130 Overcurrent Protection 705.143 Synchronous Generators ARTICLE 708 Critical Operations Power Systems (COPS) I. General 708.1 Scope 708.2 Definitions
733	708.4 Risk Assessment. 708.5 Physical Security 708.6 Testing and Maintenance 708.8 Commissioning II. Circuit Wiring and Equipment 708.10 Feeder and Branch Circuit Wiring
734	708.11 Branch Circuit and 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
735	III. Power Sources and Connection 708.20 Sources of Power
736	708.21 Ventilation 708.22 Capacity of Power Sources 708.24 Transfer Equipment 708.30 Branch Circuits Supplied by COPS IV. Overcurrent Protection 708.50 Accessibility 708.52 Ground-Fault Protection of Equipment
737	708.54 Selective Coordination V. System Performance and Analysis 708.64 Emergency Operations Plan 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 720.5 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 I. General 725.1 Scope
738	725.2 Definitions 725.3 Other Articles 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
739	725.31 Safety-Control Equipment 725.35 Class 1, Class 2, and Class 3 Circuit Requirements II. Class 1 Circuits 725.41 Class 1 Circuit Classifications and Power Source Requirements 725.43 Class 1 Circuit Overcurrent Protection 725.45 Class 1 Circuit Overcurrent Device Location
740	725.46 Class 1 Circuit Wiring Methods 725.48 Conductors of Different Circuits in the Same Cable, Cable Tray, Enclosure, or Raceway 725.49 Class 1 Circuit Conductors
741	725.51 Number of Conductors in Cable Trays and Raceway, and Ampacity Adjustment 725.52 Circuits Extending Beyond One Building III. Class 2 and Class 3 Circuits 725.121 Power Sources for Class 2 and Class 3 Circuits 725.124 Circuit Marking
742	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 725.133 Installation of Conductors and Equipment in Cables, Compartments, Cable Trays, Enclosures, Manholes, Outlet Boxes, Device Boxes, Raceways, and Cable Routing Assemblies for Class 2 and Class 3 Circuits 725.135 Installation of Class 2, Class 3, and PLTC Cables
744	725.136 Separation from Electric Light, Power, Class 1, Non—Power-Limited Fire Alarm Circuit Conductors, and Medium-Power Network-Powered Broadband Communications Cables
745	725.139 Installation of Conductors of Different Circuits in the Same Cable, Enclosure, Cable Tray, Raceway, or Cable Routing Assembly
746	725.141 Installation of Circuit Conductors Extending Beyond One Building. 725.143 Support of Conductors 725.154 Applications of Listed Class 2, Class 3, and PLTC Cables IV. Listing Requirements 725.179 Listing and Marking of Class 2, Class 3, and Type PLTC Cables; Communications Raceways; and Cable Routing Assemblies
750	ARTICLE 727 Instrumentation Tray Cable: Type ITC 727.1 Scope 727.2 Definition
751	727.3 Other Articles 727.4 Uses Permitted 727.5 Uses Not Permitted 727.6 Construction 727.7 Marking 727.8 Allowable Ampacity 727.9 Overcurrent Protection 727.10 Bends ARTICLE 728 Fire-Resistive Cable Systems 728.1 Scope 728.2 Definition 728.3 Other Articles 728.4 General
752	728.5 Installations 728.60 Grounding 728.120 Marking ARTICLE 750 Energy Management Systems 750.1 Scope 750.2 Definitions 750.20 Alternate Power Sources 750.30 Load Management
753	ARTICLE 760 Fire Alarm Systems I. General 760.1 Scope 760.1.1 Equipment and Systems 760.2 Definitions 760.3 Other Articles
754	760.21 Access to Electrical Equipment Behind Panels Designed to Allow Access 760.24 Mechanical Execution of Work 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 II. Non—Power-Limited Fire Alarm (NPLFA) Circuits 760.41 NPLFA Circuit Power Source Requirements 760.43 NPLFA Circuit Overcurrent Protection 760.45 NPLFA Circuit Overcurrent Device Location
755	760.46 NPLFA Circuit Wiring 760.48 Conductors of Different Circuits in Same Cable, Enclosure, or Raceway 760.51 Number of Conductors in Cable Trays and Raceways, and Ampacity Adjustment Factors
756	760.53 Multiconductor NPLFA Cables III. Power-Limited Fire Alarm (PLFA) Circuits 760.121 Power Sources for PLFA Circuits
757	760.124 Circuit Marking 760.127 Wiring Methods on Supply Side of the PLFA Power Source 760.130 Wiring Methods and Materials on Load Side of the PLFA Power Source 760.133 Installation of Conductors and Equipment in Cables, Compartments, Cable Trays, Enclosures, Manholes, Outlet Boxes, Device Boxes, and Raceways for Power-Limited Circuits 760.135 Installation of PLFA Cables in Buildings
759	760.136 Separation from Electric Light, Power, Class 1, NPLFA, and Medium-Power Network-Powered Broadband Communications Circuit Conductors 760.139 Installation of Conductors of Different PLFA Circuits, Class 2, Class 3, and Communications Circuits in the Same Cable, Enclosure, Cable Tray, Raceway, or Cable Routing Assembly.
760	760.142 Conductor Size 760.143 Support of Conductors 760.145 Current-Carrying Continuous Line-Type Fire Detectors 760.154 Applications of Listed PLFA Cables IV. Listing Requirements 760.176 Listing and Marking of NPLFA Cables
762	760.179 Listing and Marking of PLFA Cables and Insulated Continuous Line-Type Fire Detectors
764	ARTICLE 770 Optical Fiber Cables and Raceways I. General 770.1 Scope 770.2 Definitions 770.3 Other Articles
765	770.12 Innerduct for Optical Fiber 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 II. Cables Outside and Entering Buildings 770.47 Underground Optical Fiber Cables Entering Buildings. 770.48 Unlisted Cables and Raceways Entering Buildings
766	770.49 Metallic Entrance Conduit Grounding III. Protection 770.93 Grounding or Interruption of Non—Current-Carrying Metallic Members of Optical Fiber Cables IV. Grounding Methods 770.100 Entrance Cable Bonding and Grounding
767	770.106 Grounding and Bonding of Entrance Cables at Mobile Homes V. Installation Methods Within Buildings 770.110 Raceways and Cable Routing Assemblies for Optical Fiber Cables
768	770.113 Installation of Optical Fiber Cables
769	770.114 Grounding 770.133 Installation of Optical Fibers and Electrical Conductors
770	770.154 Applications of Listed Optical Fiber Cables VI. Listing Requirements 770.179 Optical Fiber Cables
773	770.180 Grounding Devices
776	Chapter 8 Communications Systems ARTICLE 800 Communications Circuits I. General 800.1 Scope 800.2 Definitions
777	800.3 Other Articles 800.12 Innerduct 800.18 Installation of 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
778	II. Wires and Cables Outside and Entering Buildings 800.44 Overhead (Aerial) Communications Wires and Cables 800.47 Underground Communications Wires and Cables Entering Buildings 800.48 Unlisted Cables Entering Buildings 800.49 Metallic Entrance Conduit Grounding
779	800.50 Circuits Requiring Primary Protectors 800.53 Lightning Conductors III. Protection 800.90 Protective Devices
780	800.93 Grounding or Interruption of Metallic Sheath Members of Communications Cables IV. Grounding Methods 800.100 Cable and Primary Protector Bonding and Grounding
782	800.106 Primary Protector Grounding and Bonding at Mobile Homes V. Installation Methods Within Buildings 800.110 Raceways and Cable Routing Assemblies for Communications Wires and Cables 800.113 Installation of Communications Wires, Cables and Raceways, and Cable Routing Assemblies
785	800.133 Installation of Communications Wires, Cables, and Equipment.
786	800.154 Applications of Listed Communications Wires, Cables and Raceways, and Listed Cable Routing Assemblies 800.156 Dwelling Unit Communications Outlet VI. Listing Requirements 800.170 Equipment
790	800.173 Drop Wire and Cable 800.179 Communications Wires and Cables
792	800.180 Grounding Devices 800.182 Communications Raceways and Cable Routing Assemblies ARTICLE 810 Radio and Television Equipment 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
793	II. Receiving Equipment — 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 — Receiving Station. 810.17 Size of Lead-in — Receiving Station 810.18 Clearances — Receiving Stations
794	810.19 Electrical Supply Circuits Used in Lieu of Antenna — Receiving Stations 810.20 Antenna Discharge Units — Receiving Stations. 810.21 Bonding Conductors and Grounding Electrode Conductors — Receiving Stations
795	III. Amateur and Citizen Band Transmitting and 810.51 Other Sections 810.52 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 — Transmitting Stations
796	810.58 Bonding Conductors and Grounding Electrode Conductors — Amateur and Citizen Band Transmitting and Receiving Stations IV. Interior Installation — Transmitting Stations 810.70 Clearance from Other Conductors 810.71 General ARTICLE 820 Community Antenna Television and Radio Distribution Systems I. General 820.1 Scope 820.2 Definitions
797	820.3 Other Articles 820.15 Power Limitations 820.21 Access to Electrical Equipment Behind Panels Designed to Allow Access 820.24 Mechanical Execution of Work 820.25 Abandoned Cables 820.26 Spread of Fire or Products of Combustion
798	II. Coaxial Cables Outside and Entering Buildings 820.44 Overhead (Aerial) Coaxial Cables 820.47 Underground Coaxial Cables Entering Buildings
799	820.48 Unlisted Cables Entering Buildings 820.49 Metallic Entrance Conduit Grounding III. Protection 820.93 Grounding of the Outer Conductive Shield of Coaxial Cables. IV. Grounding Methods 820.100 Cable Bonding and Grounding
801	820.103 Equipment Grounding 820.106 Grounding and Bonding at Mobile Homes V. Installation Methods Within Buildings 820.110 Raceways and Cable Routing Assemblies for Coaxial Cables 820.113 Installation of Coaxial Cables
803	820.133 Installation of Coaxial Cables and Equipment 820.154 Applications of Listed CATV Cables
805	VI. Listing Requirements 820.179 Coaxial Cables
806	ARTICLE 830 Network-Powered Broadband Communications Systems I. General 830.1 Scope 830.2 Definitions 830.3 Other Articles
807	830.15 Power Limitations 830.21 Access to Electrical Equipment Behind Panels Designed to Allow Access 830.24 Mechanical Execution of Work 830.25 Abandoned Cables 830.26 Spread of Fire or Products of Combustion
808	II. Cables Outside and Entering Buildings 830.40 Entrance Cables 830.44 Overhead (Aerial) Cables
809	830.47 Underground Network-Powered Broadband Communications Cables Entering Buildings
810	830.49 Metallic Entrance Conduit Grounding III. Protection 830.90 Primary Electrical Protection
811	830.93 Grounding or Interruption of Metallic Members of Network-Powered Broadband Communications Cables
812	IV. Grounding Methods 830.100 Cable, Network Interface Unit, and Primary Protector Bonding and Grounding
813	830.106 Grounding and Bonding at Mobile Homes V. Installation Methods Within Buildings 830.110 Raceways and Cable Routing Assemblies for Network-Powered Broadband Communications Cables
814	830.113 Installation of Network-Powered Broadband Communications Cables
815	830.133 Installation of Network-Powered Broadband Communications Cables and Equipment
816	VI. Listing Requirements 830.179 Network-Powered Broadband Communications Equipment and Cables
818	830.180 Grounding Devices
819	ARTICLE 840 Premises-Powered Broadband Communications Systems I. General 840.1 Scope 840.2 Definitions 840.3 Other Articles 840.21 Access to Electrical Equipment Behind Panels Designed to Allow Access 840.24 Mechanical Execution of Work 840.25 Abandoned Cables 840.26 Spread of Fire or Products of Combustion II. Cables Outside and Entering Buildings 840.44 Overhead Optical Fiber Cables
820	840.47 Underground Optical Fiber Cables Entering Buildings 840.48 Unlisted Cables and Raceways Entering Buildings 840.49 Metallic Entrance Conduit Grounding III. Protection 840.90 Protective Devices 840.93 Grounding or Interruption IV. Grounding Methods 840.100 ONT and Optical Fiber Cable Grounding
821	840.101 Premises Circuits Not Leaving the Building 840.106 Grounding and Bonding at Mobile Homes V. Installation Methods Within Buildings 840.110 Raceways for Premises-Powered Broadband Communications Optical Fiber Cables 840.113 Installation Past the ONT 840.133 Installation of Optical Fibers and Electrical Conductors Associated with Premises-Powered Broadband Communications Systems 840.154 Applications of Listed Optical Fiber Cables and Raceways VI. Listing Requirements 840.170 Equipment and Cables
822	840.180 Grounding Devices
825	Chapter 9 Tables Table 1 Percent of Cross Section of Conduit and Tubing for Conductors and Cables Table 2 Radius of Conduit and Tubing Bends
826	Table 4 Dimensions and Percent Area of Conduit and Tubing (Areas of Conduit or Tubing for the Combinations of Wires Permitted in Table 1, Chapter 9)
830	Table 5 Dimensions of Insulated Conductors and Fixture Wires
834	Table 5A Compact Copper and Aluminum Building Wire Nominal Dimensions* and Areas
835	Table 8 Conductor Properties
836	Table 9 Alternating-Current Resistance and Reactance for 600-Volt Cables, 3-Phase, 60 Hz, 75°C (167°F) — Three Single Conductors in Conduit
837	Table 10 Conductor Stranding
838	Table 11(A) Class 2 and Class 3 Alternating-Current Power Source Limitations
839	Table 11(B) Class 2 and Class 3 Direct-Current Power Source Limitation
840	Table 12(A) and Table 12(B) Table 12(A) PLFA Alternating-Current Power Source Limitations Table 12(B) PLFA Direct-Current Power Source Limitations
843	Informative Annex A Product Safety Standards
847	Informative Annex B Application Information for Ampacity Calculation B.310.15(B)(1) Equation Application Information B.310.15(B)(2) Typical Applications Covered by Tables B.310.15(B)(3) Criteria Modifications B.310.15(B)(4) Electrical Ducts B.310.15(B)(5) Table B.310.15(B)(2)(6) and Table B.310.15(B)(2)(7). B.310.15(B)(6) Electrical Ducts Used in Figure B.310.15(B)(2)(2)
848	B.310.15(B)(7) Examples Showing Use of Figure B.310.15(B)(2)(1) for Electrical Duct Bank Ampacity Modifications
861	Informative Annex C Conduit and Tubing Fill Tables for Conductors and Fixture Wires of the Same Size
862	Table C.1 Maximum Number of Conductors or Fixture Wires in Electrical Metallic Tubing (EMT) (Based on Chapter 9: Table 1, Table 4, and Table 5)
865	Table C.1(A) Maximum Number of Conductors or Fixture Wires in Electrical Metallic Tubing (EMT) (Based on Chapter 9: Table 1, Table 4, and Table 5A)
866	Table C.2 Maximum Number of Conductors or Fixture Wires in Electrical Nonmetallic Tubing (ENT) (Based on Chapter 9: Table 1, Table 4, and Table 5)
869	Table C.2(A) Maximum Number of Conductors or Fixture Wires in Electrical Nonmetallic Tubing (ENT) (Based on Chapter 9: Table 1, Table 4, and Table 5A)
870	Table C.3 Maximum Number of Conductors or Fixture Wires in Flexible Metal Conduit (FMC) (Based on Chapter 9: Table 1, Table 4, and Table 5)
874	Table C.4 Maximum Number of Conductors or Fixture Wires in Intermediate Metal Conduit (IMC) (Based on Chapter 9: Table 1, Table 4, and Table 5)
878	Table C.5 Maximum Number of Conductors or Fixture Wires in Liquidtight Flexible Nonmetallic Conduit (Type LFNC-B*) (Based on Chapter 9: Table 1, Table 4, and Table 5)
881	Table C.5(A) Maximum Number of Conductors or Fixture Wires in Liquidtight Flexible Nonmetallic Conduit (Type LFNC-B) (Type LFNC-B) (Based on Chapter 9: Table 1, Table 4, and Table 5A)
882	Table C.6 Maximum Number of Conductors or Fixture Wires in Liquidtight Flexible Nonmetallic Conduit (Type LFNC-A) (Based on Chapter 9: Table 1, Table 4, and Table 5)
885	Table C.6(A) Maximum Number of Conductors or Fixture Wires in Liquidtight Flexible Nonmetallic Conduit (Type LFNC-A) (Based on Chapter 9: Table 1, Table 4, and Table 5A)
886	Table C.7 Maximum Number of Conductors or Fixture Wires in Liquidtight Flexible Metal Conduit (LFMC) (Based on Chapter 9: Table 1, Table 4, and Table 5)
889	Table C.7(A) Maximum Number of Conductors or Fixture Wires in Liquidtight Flexible Metal Conduit (LFMC) (Based on Chapter 9: Table 1, Table 4, and Table 5A)
890	Table C.8 Maximum Number of Conductors or Fixture Wires in Rigid Metal Conduit (RMC) (Based on Chapter 9: Table 1, Table 4, and Table 5)
893	Table C.8(A) Maximum Number of Conductors or Fixture Wires in Rigid Metal Conduit (RMC) (Based on Chapter 9: Table 1, Table 4, and Table 5A)
894	Table C.9 Maximum Number of Conductors or Fixture Wires in Rigid PVC Conduit, Schedule 80 (Based on Chapter 9: Table 1, Table 4, and Table 5)
898	Table C.10 Maximum Number of Conductors or Fixture Wires in Rigid PVC Conduit, Schedule 40 and HDPE Conduit (Based on Chapter 9: Table 1, Table 4, and Table 5)
901	Table C.10(A) Maximum Number of Conductors or Fixture Wires in Rigid PVC Conduit, Schedule 40 and HDPE Conduit (Based on Chapter 9: Table 1, Table 4, and Table 5A)
902	Table C.11 Maximum Number of Conductors or Fixture Wires in Type A, Rigid PVC Conduit (Based on Chapter 9: Table 1, Table 4, and Table 5)
905	Table C.11(A) Maximum Number of Conductors or Fixture Wires in Type A, Rigid PVC Conduit (Based on Chapter 9: Table 1, Table 4, and Table 5A)
906	Table C.12 Maximum Number of Conductors or Fixture Wires in Type EB, PVC Conduit (Based on Chapter 9: Table 1, Table 4, and Table 5)
909	Table C.12(A) Maximum Number of Conductors or Fixture Wires in Type EB, PVC Conduit (Based on Chapter 9: Table 1, Table 4, and Table 5A)
910	Informative Annex D Examples Example D1(a) One-Family Dwelling Example D1(b) One-Family Dwelling Example D2(a) Optional Calculation for One-Family Dwelling, Heating Larger Than Air Conditioning
911	Example D2(b) Optional Calculation for One-Family Dwelling, Air Conditioning Larger Than Heating Example D2(c) Optional Calculation for One-Family Dwelling with Heat Pump (Single-Phase, 240/120-Volt Service)
912	Example D3 Store Building Example D3(a) Industrial Feeders in a Common Raceway
913	Example D4(a) Multifamily Dwelling
914	Example D4(b) Optional Calculation for Multifamily Dwelling
915	Example D5(a) Multifamily Dwelling Served at 208Y/120 Volts, Three Phase Example D5(b) Optional Calculation for Multifamily Dwelling Served at 208Y/120 Volts, Three Phase
916	Example D6 Maximum Demand for Range Loads Example D7 Sizing of Service Conductors for Dwelling(s)
917	Example D9 Feeder Ampacity Determination for Generator Field Control Example D10 Feeder Ampacity Determination for Adjustable Speed Drive Control Example D11 Mobile Home
918	Example D12 Park Trailer Example D13 Cable Tray Calculations D13(a) Multiconductor Cables 4/0 AWG and Larger D13(b) Multiconductor Cables Smaller Than 4/0 AWG
919	D13(c) Single Conductor Cables 1/0 AWG through 4/0 AWG D13(d) Single Conductor Cables 250 kcmil through 900 kcmil
920	Informative Annex E Types of Construction
922	Informative Annex F Availability and Reliability for Critical Operations Power Systems; and Development and Implementation of Functional Performance Tests (FPTs) for Critical Operations Power Systems I. Availability and Reliability for Critical Operations Power Systems
923	II. Development and Implementation of Functional Performance Tests (FPTs) for Critical Operations Power Systems Development of FPT
925	Informative Annex G Supervisory Control and Data Acquisition (SCADA)
927	Informative Annex H Administration and Enforcement 80.1 Scope 80.2 Definitions 80.3 Purpose 80.5 Adoption 80.7 Title 80.9 Application 80.11 Occupancy of Building or Structure 80.13 Authority
928	80.15 Electrical Board
930	80.17 Records and Reports 80.19 Permits and Approvals
931	80.21 Plans Review
932	80.23 Notice of Violations, Penalties 80.25 Connection to Electricity Supply
933	80.27 Inspector’s Qualifications 80.29 Liability for Damages 80.31 Validity 80.33 Repeal of Conflicting Acts 80.35 Effective Date
934	Informative Annex I Recommended Tightening Torque Tables from UL Standard 486A-B Table I.1 Tightening Torque for Screws Table I.2 Tightening Torque for Slotted Head Screws Smaller Than No. 10 Intended for Use with 8 AWG (8.4 mm²) or Smaller Conductors
935	Table I.3 Tightening Torque for Screws with Recessed Allen or Square Drives
936	Informative Annex J ADA Standards for Accessible Design J.1 Protruding Objects J.2 Protrusion Limits J.3 Post-Mounted Objects J.4 Vertical Clearance J.5 Required Clear Width
937	J.6 Forward Reach J.6.1 Unobstructed J.6.2 Obstructed High Reach J.7 Side Reach J.7.1 Unobstructed J.7.2 Obstructed High Reach
939	Index
982	HISTORY NOTE APPENDIX
984	NFPA 70® National Electrical Code® 2014 Edition: Tentative Interim Amendments Tentative Interim Amendment 14-2
985	Tentative Interim Amendment 14-3
987	Tentative Interim Amendment 14-4
988	Tentative Interim Amendment 14-5
989	Tentative Interim Amendment 14-6
990	Sequence of Events Leading to Issuance of This NFPA Committee Document
992	Information on the NFPA Standards Development Process

Published By	Publication Date	Number of Pages
CA	2016


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Standard Title	California Electrical Code, Title 24, Part 3 (W/ ERRATA & SUPPLEMENT)
Published Code	CA
Publication Date	2016

CA ElectricalCode 2016

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