IEEE 1349-2011

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IEEE Guide for Application of Electric Motors in Class I, Division 2 and Class I, Zone 2 Hazardous (Classified) Locations

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IEEE	2011

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Description

Revision Standard – Active. Three-phase and single-phase AC synchronous and induction electric motors in ratings 0.18 kW (1/4 hp) and larger are covered in this guide. Primary emphasis is on the use of open or nonexplosionproof or nonflameproof enclosed motors in Class I, Division 2 and Class I, Zone 2 locations as covered in NFPA 70-2011. Surface temperature test methods and sine wave and non-sine wave applications are covered. Precautions against excessive surface temperatures and sparking are included. To mitigate hot surface temperatures and sparking, this document provides guidance for selecting, operating, and maintaining motors in Class I, Division 2 and Class I, Zone 2 locations. This guide does not cover AC wound rotor motors and DC electric motors. Motors installed in locations other than Class I, Division 2 and Class I, Zone 2 as covered in NFPA 70-2011 are not covered in this guide. This document is not a specification and is not intended to be used as a specification for purchasing motors. The voltage breaks in this document are 1000 V and less, and over 1000 V.

PDF Catalog

PDF Pages	PDF Title
1	IEEE Std 1349-2011 Front Cover
7	Introduction Notice to users Laws and regulations Copyrights Updating of IEEE documents
8	Errata Interpretations Patents
9	Participants
12	Contents
14	Important Notice 1. Overview
15	1.1 Scope 1.2 Purpose 1.3 Background
16	1.4 Industry experience 2. Normative references
17	3. Definitions, acronyms, and abbreviations 3.1 Definitions
21	3.2 Acronyms and abbreviations
22	4. Phenomenon of a motor as a possible ignition source
23	4.1 Ignition overview 4.2 Ignition components
24	4.3 Gas AIT and group designation 4.4 Gas ingress
26	5. Common applications
27	5.1 Common application conditions
28	5.2 Surface temperatures 5.3 Sparking 5.4 General equipment considerations 5.4.1 Enclosures
29	5.4.2 Fans and ventilation systems 5.4.3 Accessories
30	5.4.3.1 Heaters 5.4.3.2 Surge arresters and capacitors 5.4.3.3 Brakes
31	5.4.3.4 Shaft grounding brushes and insulated bearings 5.4.3.5 Nameplate markings
32	5.5 Application considerations for motors 1000 V and below 5.5.1 Single-phase motors
33	5.5.2 Three-phase motors 5.5.3 Specification information 5.6 Application considerations for motors above 1000 V
34	5.6.1 Heat source considerations 5.6.2 Sparking considerations 5.6.2.1 Sparking across bearing lubrication 5.6.2.2 Joints and clearances
35	5.6.2.3 Rotors 5.6.2.4 Insulation systems for motors over 6 kV 5.6.3 Separate lube oil systems
36	5.7 Application considerations for synchronous motors
37	5.7.1 Brushless synchronous motor components
39	5.7.2 External excitation control panel 6. Uncommon application considerations 6.1 High or low ambient temperature 6.2 High altitudes
40	6.3 Nonsinusoidal power or adjustable speed operations 6.3.1 Effect of adjustable speed drives 6.3.1.1 Increased temperature due to harmonics 6.3.1.2 Increased temperature due to reduced speed 6.3.1.3 Common-mode voltages
41	6.3.2 Common adjustable speed drive applications
42	6.3.3 Uncommon adjustable speed drive applications 6.3.4 Referenced specifications for adjustable speed drives applications
43	6.4 Duty cycle other than continuous 6.5 Excessive starts 6.6 High inertia load
44	6.7 NEMA Design C or D and low inrush motors 6.8 Voltage and frequency variation
45	6.9 Overload 6.9.1 Overload heating 6.9.2 Operating above base nameplate, but within the service factor 6.9.3 Overload device settings impact
46	6.9.4 Motor stator temperature protection 6.10 Atmospheres with an AIT at or less than those of Table 1 6.11 Motor exposed surface temperature above Table 1 values or above Class B rise
47	6.12 Other considerations 6.12.1 Pressurization, purging, or ventilation 6.12.2 Use of gas detection equipment
48	7. Operation and maintenance considerations 7.1 Commissioning considerations
49	7.2 Maintenance considerations 7.2.1 General 7.2.2 Motor prefailure symptoms
50	7.2.3 Rewind/repair considerations 8. Preferred motor internal surface temperature test methods
51	8.1 Preferred motor rotor surface temperature test methods 8.1.1 Heat-sensitive paint method 8.1.2 Heat-sensitive labels method 8.1.3 Rotor thermocouple/thermistor method 8.2 Motor surface temperature test procedures
52	8.2.1 Heat-sensitive paint test method procedure
53	8.2.2 Heat-sensitive label test method procedure
54	8.2.3 Rotor thermocouple/thermistor test methods 8.2.3.1 Rotor thermocouple with slip ring
55	8.2.3.2 Rotor thermocouple without slip ring 8.2.3.3 Rotor thermocouple with wireless transducer 8.2.3.4 Rotor thermocouple with data logger
56	8.2.3.5 Thermocouples on rotor surface through stator vents at shutdown
57	Annex A (informative) Bibliography
61	Annex B (informative) Regulations and standards for motors used in areas where flammable gases or vapors may be present B.1 Occupational Safety and Health Administration (OSHA) B.2 National Fire Protection Association
62	B.3 American Petroleum Institute B.4 International standards B.4.1 British Standards Institution
63	B.4.2 Canadian Standards Association International B.4.3 European Committee for Electrotechnical Standards B.4.4 International Electrotechnical Commission
64	Annex C (informative) AIT and group designations for Class I materials C.1 AITs C.1.1 Test methods and why results differ
66	C.1.2 History of AIT in the NEC C.1.3 NEC temperature identification numbers
68	C.1.4 Gases and vapors, heavier-than-air and lighter-than-air
69	Annex D (informative) Motor enclosure types and protection techniques
70	D.1 Open motor (IP00, IC01) D.1.1 Open dripproof motor (IP12, IC01) D.1.2 Open externally ventilated motor (IP12/13, IC06) D.1.3 Open pipe-ventilated motor (IP12/13, IC11/17)
71	D.1.4 Weather-protected Type I motor (IP23, IC01) D.1.5 Weather-protected Type II motor (IPW24, IC01) D.2 Totally enclosed motor D.2.1 Totally enclosed nonventilated motor (IP44/54, IC410) D.2.2 Totally enclosed fan-cooled motor (IP44/54, IC411) D.2.3 Explosionproof motor (IP44/54, IC411, AEx “d”) D.2.4 Totally enclosed pipe-ventilated motor (IP44, IC31/37)
72	D.2.5 Totally enclosed water-to-air cooled motor (IP44/54, IC81W) D.2.6 Totally enclosed air-to-air cooled motor (IP44/54, IC611/616) D.2.7 Totally enclosed air-over motor (IP54, IC417) D.3 Zone protection methods
73	D.3.1 Flameproof—“d” D.3.2 Increased safety—“e”
74	D.3.3 Purged and pressurized— “p” D.3.4 Non-sparking— “n”
75	D.3.5 Intrinsically safe— “ia” or “ib”
76	Annex E (informative) Motor information tables
80	Annex F (informative) Multisection motor inspection procedure
81	Annex G (informative) Motor sparking considerations G.1 General
82	G.2 Motors over 1000 V G.2.1 Air gap between the rotor and stator G.2.2 Stator winding discharges
83	G.2.3 Rotor components G.2.3.1 Rotor ducts G.2.3.2 Rotor design G.2.3.3 Rotor attachment G.2.3.4 Broken or open bars and end rings
84	G.2.4 Multisection enclosures
88	Annex H (informative) Surface temperature study results and considerations H.1 Hot motor surfaces H.1.1 Enclosures H.1.2 Rotor
89	H.1.3 Stator H.2 Surface temperature study results
90	H.2.1 AIT test results H.2.1.1 Phase 1 AIT test results on TEFC and ODP motors
93	H.2.1.2 Phase 2 AIT test results on ODP motors
94	H.2.2 Working Group motor surface temperature test results H.2.2.1 TEFC energy efficient motors
95	H.2.2.2 TEFC standard efficiency motors
96	H.2.2.3 ODP standard efficiency motors H.2.3 Independent manufacturers’ tests and calculations
108	H.2.4 Independent manufacturers’ tests using ASDs
115	H.3 Temperature test observations H.3.1 AIT observations
116	H.3.2 Surface temperature observations sinusoidal power H.3.3 Surface temperature observations non-sinusoidal power
118	Annex I (informative) Motor surface temperature test methods and limitations
119	I.1 Infrared method I.1.1 Infrared thermometer through motor endshield I.1.2 Infrared camera through stator vents I.1.3 Infrared borescope
120	I.2 Thermocouples placed in the air gap I.3 Hot versus cold slip
121	I.4 Stator thermocouples I.5 Thermodynamic computer model Annex J (informative) Event history

Additional information

Standard Title	IEEE Guide for Application of Electric Motors in Class I, Division 2 and Class I, Zone 2 Hazardous (Classified) Locations
Published Code	IEEE
Publication Date	2011

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