Important Notices and Disclaimers......Page 2
Additional Notices And Disclaimers
......Page 3
Contents
......Page 5
90 Introduction......Page 25
100 Definitions
......Page 29
110 Requirements for Electrical Installations
......Page 37
200 Use and Identification of Grounded
Conductors......Page 49
210
Branch Circuits......Page 51
215
Feeders......Page 62
220
Branch-Circuit, Feeder, and Service Calculations......Page 64
225
Outside Branch Circuits and Feeders......Page 74
230
Services......Page 81
240
Overcurrent Protection......Page 91
250
Grounding and Bonding......Page 103
Table 250.66 Grounding Electrode Conductor for
Alternating-Current Systems......Page 118
Table 250.122 Minimum Size Equipment Grounding
Conductors for Grounding Raceway and Equipment......Page 128
280
Surge Arresters, Over 1 kV......Page 134
285
Surge-Protective Devices (SPDs),1 kV or Less......Page 136
300
Wiring Methods......Page 138
310
Conductors for General Wiring......Page 150
Table 310.15(B)(3)(a) Adjustment Factors for More Than
Three Current-Carrying Conductors in a Raceway or Cable......Page 155
Table 310.15(B)(16
) Allowable Ampacities of Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth......Page 157
312 Cabinets, Cutout Boxes, and Meter
Socket Enclosures......Page 176
314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures
......Page 180
Table 314.16 Box Fill
......Page 182
320
Armored Cable: Type AC......Page 189
322
Flat Cable Assemblies: Type FC......Page 190
324
Flat Conductor Cable: Type FCC......Page 192
326
Integrated Gas Spacer Cable: Type IGS......Page 194
330
Metal-Clad Cable: Type MC......Page 195
332 Mineral-Insulated, Metal-Sheathed
Cable: Type MI......Page 197
334 Nonmetallic-Sheathed Cable: Types NM,
NMC, and NMS......Page 199
336
Power and Control Tray Cable: Type TC......Page 201
338 Service-Entrance Cable:
Types SE and USE......Page 203
340 Underground Feeder and Branch-Circuit
Cable: Type UF......Page 204
342
Intermediate Metal Conduit: Type IMC......Page 205
344
Rigid Metal Conduit: Type RMC......Page 206
348
Flexible Metal Conduit: Type FMC......Page 208
350 Liquidtight Flexible Metal Conduit:
Type LFMC......Page 210
352 Rigid Polyvinyl Chloride Conduit: Type
PVC......Page 211
353
High Density Polyethylene Conduit:Type HDPE Conduit......Page 214
354 Nonmetallic Underground Conduit with
Conductors: Type NUCC......Page 215
355 Reinforced Thermosetting Resin
Conduit: Type RTRC......Page 216
356
Liquidtight Flexible NonmetallicConduit: Type LFNC......Page 219
358
Electrical Metallic Tubing: Type EMT......Page 221
360
Flexible Metallic Tubing: Type FMT......Page 222
362
Electrical Nonmetallic Tubing:Type ENT......Page 223
366
Auxiliary Gutters......Page 225
368
Busways......Page 227
370
Cablebus......Page 230
372
Cellular Concrete Floor Raceways......Page 231
374
Cellular Metal Floor Raceways......Page 232
376
Metal Wireways......Page 233
378
Nonmetallic Wireways......Page 234
380
Multioutlet Assembly......Page 235
382
Nonmetallic Extensions......Page 236
384
Strut-Type Channel Raceway......Page 238
386
Surface Metal Raceways......Page 239
388
Surface Nonmetallic Raceways......Page 240
390
Underfloor Raceways......Page 241
392
Cable Trays......Page 242
394
Concealed Knob-and-Tube Wiring......Page 249
396
Messenger-Supported Wiring......Page 250
398
Open Wiring on Insulators......Page 251
399
Outdoor Overhead Conductors over 600Volts......Page 253
400
Flexible Cords and Cables......Page 254
402
Fixture Wires......Page 265
404 Switches
......Page 269
406 Receptacles, Cord Connectors, and
Attachment Plugs (Caps)......Page 273
408
Switchboards and Panelboards......Page 277
409
Industrial Control Panels......Page 281
410
Luminaires, Lampholders, and Lamps......Page 283
411 Lighting Systems Operating at
30 Volts or Less......Page 292
422
Appliances......Page 293
424
Fixed Electric Space-Heating Equipment......Page 298
426 Fixed Outdoor Electric Deicing and Snow-Melting Equipment
......Page 307
427
Fixed Electric Heating Equipment for Pipelines and Vessels......Page 310
430
Motors, Motor Circuits, and Controllers......Page 313
Table 430.248 Full-Load Currents in Amperes, Single-Phase
Alternating-Current Motors......Page 340
440
Air-Conditioning and Refrigerating Equipment......Page 343
450
Transformers and Transformer Vaults (Including Secondary Ties)......Page 351
455
Phase Converters......Page 358
460
Capacitors......Page 360
470
Resistors and Reactors......Page 361
480
Storage Batteries......Page 362
490
Equipment, Over 600 Volts, Nominal......Page 363
500
Hazardous (Classified) Locations, Classes I, II, and III, Divisions 1 and 2......Page 370
501
Class I Locations......Page 379
502
Class II Locations......Page 389
503
Class III Locations......Page 394
504
Intrinsically Safe Systems......Page 397
505
Zone 0, 1, and 2 Locations......Page 400
506
Zone 20, 21, and 22 Locations for Combustible Dusts or Ignitible Fibers/Flyings......Page 415
511
Commercial Garages, Repair and Storage......Page 422
513
Aircraft Hangars......Page 425
514
Motor Fuel Dispensing Facilities......Page 428
515
Bulk Storage Plants......Page 432
516
Spray Application, Dipping, and Coating Processes......Page 437
517
Health Care Facilities......Page 443
518
Assembly Occupancies......Page 461
520
Theaters, Audience Areas of Motion Picture and Television Studios, Performance Areas, and Similar Locations......Page 462
522
Control Systems for Permanent Amusement Attractions......Page 471
525
Carnivals, Circuses, Fairs, and Similar Events......Page 473
530
Motion Picture and Television Studios and Similar Locations......Page 475
540
Motion Picture Projection Rooms......Page 479
545
Manufactured Buildings......Page 480
547
Agricultural Buildings......Page 481
550
Mobile Homes, Manufactured Homes, and Mobile Home Parks......Page 484
551
Recreational Vehicles and Recreational Vehicle Parks......Page 493
552
Park Trailers......Page 506
553
Floating Buildings......Page 515
555
Marinas and Boatyards......Page 516
590
Temporary Installations......Page 519
600
Electric Signs and Outline Lighting......Page 522
604
Manufactured Wiring Systems......Page 528
605
Office Furnishings (Consisting of Lighting Accessories and Wired Partitions)......Page 529
610
Cranes and Hoists......Page 530
620
Elevators, Dumbwaiters, Escalators, Moving Walks, Platform Lifts, and Stairway Chairlifts......Page 535
625
Electric Vehicle Charging System......Page 546
626
Electrified Truck Parking Spaces......Page 550
630
Electric Welders......Page 555
640
Audio Signal Processing, Amplification, and Reproduction Equipment......Page 557
645
Information Technology Equipment......Page 562
647
Sensitive Electronic Equipment......Page 566
650
Pipe Organs......Page 567
660
X-Ray Equipment......Page 568
665
Induction and Dielectric Heating Equipment......Page 570
668
Electrolytic Cells......Page 571
669
Electroplating......Page 574
670
Industrial Machinery......Page 575
675
Electrically Driven or Controlled Irrigation Machines......Page 576
680
Swimming Pools, Fountains, and Similar Installations......Page 578
682
Natural and Artificially Made Bodies of Water......Page 593
685
Integrated Electrical Systems......Page 595
690
Solar Photovoltaic (PV) Systems......Page 596
692
Fuel Cell Systems......Page 610
694
Small Wind Electric Systems......Page 613
695
Fire Pumps......Page 619
700
Emergency Systems......Page 625
701
Legally Required Standby Systems......Page 630
702
Optional Standby Systems......Page 633
705
Interconnected Electric Power Production Sources......Page 634
708
Critical Operations Power Systems (COPS)......Page 638
720
Circuits and Equipment Operating at Less Than 50 Volts......Page 643
725
Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits......Page 644
727
Instrumentation Tray Cable: Type ITC......Page 653
760
Fire Alarm Systems......Page 654
770
Optical Fiber Cables and Raceways......Page 663
800
Communications Circuits......Page 672
810
Radio and Television Equipment......Page 685
820
Community Antenna Television and Radio Distribution Systems......Page 689
830
Network-Powered Broadband Communications Systems......Page 698
840
Premises-Powered Broadband Communications Systems......Page 710
Table 2 Radius of Conduit and Tubing Bends
......Page 714
Table 4 Dimensions and Percent Area of Conduit and Tubing
......Page 715
Table 5 Dimensions of Insulated Conductors and Fixture Wires
......Page 719
Table 8 Conductor Properties
......Page 724
Table 9 Alternating-Current Resistance and Reactance for 600-Volt Cables, 3-Phase, 60 Hz, 75ยฐC (167ยฐF) โ Three Single Conductors in Conduit
......Page 725
Table 10 Conductor Stranding......Page 726
Table 11(A) Class 2 and Class 3 Alternating-Current Power Source Limitations
......Page 727
Tables 12(A) and 12(B) PLFA
Power Source Limitations......Page 729
Informative Annex A Product Safety Standards
......Page 730
Informative Annex B Application Information for Ampacity Calculation
......Page 733
Informative Annex C Conduit and Tubing Fill Tables for Conductors
and Fixture Wires of the Same Size......Page 747
Informative Annex D Examples
......Page 807
Informative Annex E Types of Construction
......Page 817
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
......Page 819
Informative Annex G Supervisory Control and Data Acquisition (SCADA)
......Page 822
Informative Annex H Administration and Enforcement
......Page 824
Informative Annex I Recommended Tightening Torque Tables from UL Standard 486A-B
......Page 831
Index
......Page 833
Formal Interpretations
......Page 874
FORM FOR PROPOSAL FOR 2014 NATIONAL ELECTRICAL CODEยฎ
......Page 878