NFPA 70: National Electrical Code (NEC) Handbook, 2011 Edition

Important Notices and Disclaimers......Page 2
Additional Notices And Disclaimers\r......Page 3
Contents\r......Page 5
90 Introduction......Page 25
100 Definitions\r......Page 29
110 Requirements for Electrical Installations\r......Page 37
200 Use and Identification of Grounded \rConductors......Page 49
210\rBranch Circuits......Page 51
215\rFeeders......Page 62
220\rBranch-Circuit, Feeder, and Service Calculations......Page 64
225\rOutside Branch Circuits and Feeders......Page 74
230\rServices......Page 81
240\rOvercurrent Protection......Page 91
250\rGrounding and Bonding......Page 103
Table 250.66 Grounding Electrode Conductor for\rAlternating-Current Systems......Page 118
Table 250.122 Minimum Size Equipment Grounding\rConductors for Grounding Raceway and Equipment......Page 128
280\rSurge Arresters, Over 1 kV......Page 134
285\rSurge-Protective Devices (SPDs),1 kV or Less......Page 136
300\rWiring Methods......Page 138
310\rConductors for General Wiring......Page 150
Table 310.15(B)(3)(a) Adjustment Factors for More Than\rThree Current-Carrying Conductors in a Raceway or Cable......Page 155
Table 310.15(B)(16\r) Allowable Ampacities of Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth......Page 157
312 Cabinets, Cutout Boxes, and Meter\rSocket Enclosures......Page 176
314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures\r......Page 180
Table 314.16 Box Fill\r......Page 182
320\rArmored Cable: Type AC......Page 189
322\rFlat Cable Assemblies: Type FC......Page 190
324\rFlat Conductor Cable: Type FCC......Page 192
326\rIntegrated Gas Spacer Cable: Type IGS......Page 194
330\rMetal-Clad Cable: Type MC......Page 195
332 Mineral-Insulated, Metal-Sheathed\rCable: Type MI......Page 197
334 Nonmetallic-Sheathed Cable: Types NM,\rNMC, and NMS......Page 199
336\rPower and Control Tray Cable: Type TC......Page 201
338 Service-Entrance Cable:\rTypes SE and USE......Page 203
340 Underground Feeder and Branch-Circuit\rCable: Type UF......Page 204
342\rIntermediate Metal Conduit: Type IMC......Page 205
344\rRigid Metal Conduit: Type RMC......Page 206
348\rFlexible Metal Conduit: Type FMC......Page 208
350 Liquidtight Flexible Metal Conduit:\rType LFMC......Page 210
352 Rigid Polyvinyl Chloride Conduit: Type\rPVC......Page 211
353\rHigh Density Polyethylene Conduit:Type HDPE Conduit......Page 214
354 Nonmetallic Underground Conduit with\rConductors: Type NUCC......Page 215
355 Reinforced Thermosetting Resin\rConduit: Type RTRC......Page 216
356\rLiquidtight Flexible NonmetallicConduit: Type LFNC......Page 219
358\rElectrical Metallic Tubing: Type EMT......Page 221
360\rFlexible Metallic Tubing: Type FMT......Page 222
362\rElectrical Nonmetallic Tubing:Type ENT......Page 223
366\rAuxiliary Gutters......Page 225
368\rBusways......Page 227
370\rCablebus......Page 230
372\rCellular Concrete Floor Raceways......Page 231
374\rCellular Metal Floor Raceways......Page 232
376\rMetal Wireways......Page 233
378\rNonmetallic Wireways......Page 234
380\rMultioutlet Assembly......Page 235
382\rNonmetallic Extensions......Page 236
384\rStrut-Type Channel Raceway......Page 238
386\rSurface Metal Raceways......Page 239
388\rSurface Nonmetallic Raceways......Page 240
390\rUnderfloor Raceways......Page 241
392\rCable Trays......Page 242
394\rConcealed Knob-and-Tube Wiring......Page 249
396\rMessenger-Supported Wiring......Page 250
398\rOpen Wiring on Insulators......Page 251
399\rOutdoor Overhead Conductors over 600Volts......Page 253
400\rFlexible Cords and Cables......Page 254
402\rFixture Wires......Page 265
404 Switches\r......Page 269
406 Receptacles, Cord Connectors, and \rAttachment Plugs (Caps)......Page 273
408\rSwitchboards and Panelboards......Page 277
409\rIndustrial Control Panels......Page 281
410\rLuminaires, Lampholders, and Lamps......Page 283
411 Lighting Systems Operating at\r30 Volts or Less......Page 292
422\rAppliances......Page 293
424\rFixed Electric Space-Heating Equipment......Page 298
426 Fixed Outdoor Electric Deicing and Snow-Melting Equipment\r......Page 307
427\rFixed Electric Heating Equipment for Pipelines and Vessels......Page 310
430\rMotors, Motor Circuits, and Controllers......Page 313
Table 430.248 Full-Load Currents in Amperes, Single-Phase\rAlternating-Current Motors......Page 340
440\rAir-Conditioning and Refrigerating Equipment......Page 343
450\rTransformers and Transformer Vaults (Including Secondary Ties)......Page 351
455\rPhase Converters......Page 358
460\rCapacitors......Page 360
470\rResistors and Reactors......Page 361
480\rStorage Batteries......Page 362
490\rEquipment, Over 600 Volts, Nominal......Page 363
500\rHazardous (Classified) Locations, Classes I, II, and III, Divisions 1 and 2......Page 370
501\rClass I Locations......Page 379
502\rClass II Locations......Page 389
503\rClass III Locations......Page 394
504\rIntrinsically Safe Systems......Page 397
505\rZone 0, 1, and 2 Locations......Page 400
506\rZone 20, 21, and 22 Locations for Combustible Dusts or Ignitible Fibers/Flyings......Page 415
511\rCommercial Garages, Repair and Storage......Page 422
513\rAircraft Hangars......Page 425
514\rMotor Fuel Dispensing Facilities......Page 428
515\rBulk Storage Plants......Page 432
516\rSpray Application, Dipping, and Coating Processes......Page 437
517\rHealth Care Facilities......Page 443
518\rAssembly Occupancies......Page 461
520\rTheaters, Audience Areas of Motion Picture and Television Studios, Performance Areas, and Similar Locations......Page 462
522\rControl Systems for Permanent Amusement Attractions......Page 471
525\rCarnivals, Circuses, Fairs, and Similar Events......Page 473
530\rMotion Picture and Television Studios and Similar Locations......Page 475
540\rMotion Picture Projection Rooms......Page 479
545\rManufactured Buildings......Page 480
547\rAgricultural Buildings......Page 481
550\rMobile Homes, Manufactured Homes, and Mobile Home Parks......Page 484
551\rRecreational Vehicles and Recreational Vehicle Parks......Page 493
552\rPark Trailers......Page 506
553\rFloating Buildings......Page 515
555\rMarinas and Boatyards......Page 516
590\rTemporary Installations......Page 519
600\rElectric Signs and Outline Lighting......Page 522
604\rManufactured Wiring Systems......Page 528
605\rOffice Furnishings (Consisting of Lighting Accessories and Wired Partitions)......Page 529
610\rCranes and Hoists......Page 530
620\rElevators, Dumbwaiters, Escalators, Moving Walks, Platform Lifts, and Stairway Chairlifts......Page 535
625\rElectric Vehicle Charging System......Page 546
626\rElectrified Truck Parking Spaces......Page 550
630\rElectric Welders......Page 555
640\rAudio Signal Processing, Amplification, and Reproduction Equipment......Page 557
645\rInformation Technology Equipment......Page 562
647\rSensitive Electronic Equipment......Page 566
650\rPipe Organs......Page 567
660\rX-Ray Equipment......Page 568
665\rInduction and Dielectric Heating Equipment......Page 570
668\rElectrolytic Cells......Page 571
669\rElectroplating......Page 574
670\rIndustrial Machinery......Page 575
675\rElectrically Driven or Controlled Irrigation Machines......Page 576
680\rSwimming Pools, Fountains, and Similar Installations......Page 578
682\rNatural and Artificially Made Bodies of Water......Page 593
685\rIntegrated Electrical Systems......Page 595
690\rSolar Photovoltaic (PV) Systems......Page 596
692\rFuel Cell Systems......Page 610
694\rSmall Wind Electric Systems......Page 613
695\rFire Pumps......Page 619
700\rEmergency Systems......Page 625
701\rLegally Required Standby Systems......Page 630
702\rOptional Standby Systems......Page 633
705\rInterconnected Electric Power Production Sources......Page 634
708\rCritical Operations Power Systems (COPS)......Page 638
720\rCircuits and Equipment Operating at Less Than 50 Volts......Page 643
725\rClass 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits......Page 644
727\rInstrumentation Tray Cable: Type ITC......Page 653
760\rFire Alarm Systems......Page 654
770\rOptical Fiber Cables and Raceways......Page 663
800\rCommunications Circuits......Page 672
810\rRadio and Television Equipment......Page 685
820\rCommunity Antenna Television and Radio Distribution Systems......Page 689
830\rNetwork-Powered Broadband Communications Systems......Page 698
840\rPremises-Powered Broadband Communications Systems......Page 710
Table 2 Radius of Conduit and Tubing Bends\r......Page 714
Table 4 Dimensions and Percent Area of Conduit and Tubing\r......Page 715
Table 5 Dimensions of Insulated Conductors and Fixture Wires\r......Page 719
Table 8 Conductor Properties\r......Page 724
Table 9 Alternating-Current Resistance and Reactance for 600-Volt Cables, 3-Phase, 60 Hz, 75°C (167°F) — Three Single Conductors in Conduit\r......Page 725
Table 10 Conductor Stranding......Page 726
Table 11(A) Class 2 and Class 3 Alternating-Current Power Source Limitations\r......Page 727
Tables 12(A) and 12(B) PLFA \rPower Source Limitations......Page 729
Informative Annex A Product Safety Standards\r......Page 730
Informative Annex B Application Information for Ampacity Calculation\r......Page 733
Informative Annex C Conduit and Tubing Fill Tables for Conductors\rand Fixture Wires of the Same Size......Page 747
Informative Annex D Examples\r......Page 807
Informative Annex E Types of Construction\r......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\r......Page 819
Informative Annex G Supervisory Control and Data Acquisition (SCADA)\r......Page 822
Informative Annex H Administration and Enforcement\r......Page 824
Informative Annex I Recommended Tightening Torque Tables from UL Standard 486A-B\r......Page 831
Index\r......Page 833
Formal Interpretations\r......Page 874
FORM FOR PROPOSAL FOR 2014 NATIONAL ELECTRICAL CODE®\r......Page 878