Interpreting the National Electrical Code , Eighth Edition

Cover Page......Page 1
Title Page......Page 3
Copyright Page......Page 4
BRIEF CONTENTS......Page 5
CONTENTS......Page 7
SAMPLE CALCULATIONS......Page 16
INTERNATIONAL RESIDENTIAL CODE®......Page 17
TO THE STUDENT......Page 18
REVIEWERS......Page 19
ACKNOWLEDGMENTS......Page 20
Process of Revising the Code......Page 21
Example of String Multiplication......Page 22
AC and DC......Page 23
Metric Conversions......Page 24
Wire Dimensions......Page 25
Wire Resistance......Page 27
Ohm’s Law......Page 29
Circuits......Page 30
Power and Work Formulas......Page 32
Student Practice Problems......Page 34
Art. 100: Definitions......Page 36
Art. 110: Requirements for electrical installations......Page 37
Art. 200: Use and identification of grounded conductors......Page 38
Art. 300: Wiring methods......Page 39
Art. 310: Conductors for general wiring......Page 40
Art. 320: Armored cable......Page 41
Art. 328: Medium-voltage cable......Page 42
Art. 334: Nonmetallic-sheathed cable......Page 43
Art. 338: Service-entrance cable......Page 44
Ch. 9: Tables 8 and 9......Page 45
SIZING CONDUCTORS FOR A CIRCUIT......Page 46
USING THE CODE TO ANSWER QUESTIONS......Page 49
STUDENT CODE PRACTICE......Page 50
Art 100......Page 52
Art 110......Page 53
Art 200......Page 54
Art 210......Page 55
Art 310......Page 56
Art 334......Page 57
Art 338......Page 58
Art 590......Page 59
WORKSHEET NO. 1—BEGINNING GENERAL WIRING AND FUNDAMENTALS......Page 60
WORKSHEET NO. 1—ADVANCED GENERAL WIRING AND FUNDAMENTALS......Page 65
Art. 314: Outlet, device, pull, and junction boxes; conduit bodies; fittings; and handhole enclosures......Page 71
Art. 342: Intermediate metal conduit (IMC)......Page 72
Art. 356: Liquidtight flexible nonmetallic conduit (LFNC)......Page 73
Art. 352: Rigid Polyvinyl chloride conduit (PVC)......Page 74
Art. 362: Electrical nonmetallic tubing (ENT......Page 77
Art. 378: Nonmetallic wireways......Page 78
Ch. 9: Tables 1, 2, 4, 5, and 5A......Page 79
Protecting Conductors......Page 81
Neutral as a Current-Carrying Conductor......Page 82
Sizing Conductors......Page 84
Sizing Conduit and Tubing......Page 88
Sizing Conduit and Tubing Nipples......Page 89
Wireway Sizing......Page 90
Sizing Boxes......Page 91
Pull Boxes......Page 93
Conduit Bodies......Page 95
Sizing and Installing Parallel Conductor Sets......Page 96
Art 314......Page 98
Art 344......Page 99
Art 353......Page 100
Art 362......Page 101
Ch. 9......Page 102
WORKSHEET NO. 2—BEGINNING WIRE, RACEWAY, AND BOX SIZING......Page 103
WORKSHEET NO. 2—ADVANCED WIRE, RACEWAY, AND BOX SIZING......Page 108
Art. 210: Branch-circuits......Page 115
Art. 225: Outside branch-circuits and feeders......Page 121
Art. 400: Flexible cords and cables......Page 122
Art. 406: Receptacles, cord connectors, and attachment plugs......Page 123
Art. 410: Luminaires, lampholders, and lamps......Page 124
Art. 725: Class 1, 2, and 3 remote-control, signaling, and power-limited circuits......Page 125
Circuit and outlet requirements......Page 126
Electric range for a dwelling......Page 128
Art. 210......Page 131
Art. 406......Page 135
Art. 410......Page 136
Art. 424......Page 137
Art. 725......Page 138
WORKSHEET NO. 3—Beginning......Page 139
WORKSHEET NO. 3—Advanced......Page 144
Art. 215: Feeders......Page 149
Art. 220: Feeder and service calculations......Page 152
Art. 230: Services......Page 156
Annex D: Examples......Page 160
Example of a commercial service calculation......Page 161
Example of a single-family dwelling demand load......Page 163
Farm building demand load......Page 165
Art. 215......Page 166
Art. 220......Page 167
Art. 230......Page 168
WORKSHEET NO. 4—Beginning......Page 170
WORKSHEET NO. 4—Advanced......Page 174
Art. 250: Grounding and bonding......Page 179
Art. 285: Surge-protective devices (SPDs)......Page 184
Art. 680: Swimming pools, fountains, and similar installations......Page 186
Equipment grounding......Page 187
Sizing equipment grounding conductors......Page 188
Equipment grounding conductor size adjustments......Page 189
Electrical shock......Page 190
Grounding electrode......Page 191
Grounding and bonding for service with parallel conductors......Page 192
ELECTRICAL SYSTEM TYPES AND VOLTAGES......Page 193
Single-phase electrical systems......Page 194
Three-phase electrical......Page 195
High-impedance grounding......Page 196
Art. 250......Page 198
Art. 280......Page 201
Art. 680......Page 202
WORKSHEET NO. 5—Beginning......Page 206
WORKSHEET NO. 5—Advanced......Page 211
Art. 240: Overcurrent protection......Page 219
Art. 408: Switchboards and panelboards......Page 224
Art. 550: Mobile homes, manufactured homes, and mobile home parks......Page 225
Art. 551: Recreational vehicles and recreational vehicle parks......Page 226
Art. 552: Park trailers......Page 228
Symmetrical and asymmetrical......Page 229
How damage occurs......Page 230
Current limiting......Page 231
Feeder taps......Page 232
VOLTAGE DROP......Page 236
Art. 408......Page 239
Art. 550......Page 241
Art. 551......Page 243
WORKSHEET NO. 6—Beginning......Page 244
WORKSHEET NO. 6—Advanced......Page 249
Art. 409: Industrial control panels......Page 255
Art. 430: Motors, motor circuits, and controllers......Page 256
Art. 455: Phase converters......Page 257
Art. 460: Capacitors......Page 259
Annex D: Examples......Page 260
Motor nameplate and other information......Page 261
Methods of controlling motors......Page 262
Motor overload protection......Page 263
Remote control circuit wires......Page 265
Motor-circuit ex......Page 266
MOTOR-CONTROL CIRCUIT WIRING......Page 270
CONDENSATION IN MOTORS......Page 272
ADJUSTABLE-SPEED-DRIVES......Page 273
WYE-DELTA MOTOR STARTING......Page 274
Art. 430......Page 276
Art. 675......Page 278
WORKSHEET NO. 7—Beginning......Page 279
WORKSHEET NO. 7—Advanced......Page 284
Art. 450: Transformers and transformer vaults......Page 291
Voltage and turns ratio......Page 292
Transformer ratings......Page 293
Three-phase transformers......Page 294
Winding taps......Page 295
Boost and buck transformers......Page 297
K-rated transformers......Page 298
OVERCURRENT PROTECTION FOR TRANSFORMERS......Page 299
Overcurrent protection only on the primary (600 volts or less)......Page 300
Primary and secondary overcurrent protection (600 volts or less)......Page 302
Boost and buck transformer overcurrent protection......Page 305
TRANSFORMER TAPS......Page 306
TRANSFORMER GROUNDING......Page 310
Art. 450......Page 312
WORKSHEET NO. 8—Beginning......Page 313
WORKSHEET NO. 8—Advanced......Page 320
CODE DISCUSSION......Page 327
Art. 504: Intrinsically safe systems......Page 328
Art. 505: Class I, Zone 0, 1, and 2 locations......Page 329
Art. 506: Zone 20, 21, and 22 locations for combustile dusts or ignitible fibers/flyings......Page 331
Art. 514: Motor fuel dispensing facilities......Page 332
Types of hazardous locations......Page 333
Objectives of explosionproof enclosures......Page 334
Sealing fittings......Page 335
Dust-ignitionproof equipment......Page 337
Special occupancies......Page 338
Art. 501......Page 339
Art. 504......Page 340
Art. 506......Page 341
Art. 514......Page 342
Art. 516......Page 343
WORKSHEET NO. 9—Beginning......Page 344
WORKSHEET NO. 9—Advanced......Page 349
Art. 517: Health care facilities......Page 355
Definition of areas within a hospital......Page 359
Grounding in hospitals......Page 360
Ground-fault protection......Page 362
Art. 517......Page 363
WORKSHEET NO. 10—Beginning......Page 365
WORKSHEET NO. 10—Advanced......Page 369
Art. 445: Generators......Page 375
Art. 690: Solar photovoltaic systems......Page 376
Art. 695: Fire pumps......Page 377
Art. 700: Emergency systems......Page 378
Art. 702: Optional standby systems......Page 379
EMERGENCY ELECTRICAL SYSTEMS......Page 380
Fire alarm systems......Page 381
Wiring fire alarm systems......Page 382
Fire pumps......Page 384
ALTERNATE ELECTRICAL POWER SYSTEMS......Page 387
Solar photovoltaic systems......Page 388
Fuel cell systems......Page 391
Storage batteries......Page 393
Generators......Page 394
Connecting alternate power sources......Page 395
Grounding dc power sources......Page 396
Direct current rating......Page 397
Art. 690......Page 398
Art. 700......Page 400
Art. 705......Page 401
Art. 708......Page 403
Art. 760......Page 404
WORKSHEET NO. 11—Beginning......Page 406
WORKSHEET NO. 11—Advanced......Page 411
Art. 326: Integrated gas spacer cable......Page 417
Art. 370: Cablebus......Page 418
Art. 392: Cable trays......Page 419
Art. 427: Fixed electric heating equipment for pipelines and vessels......Page 421
Art. 630: Electric welders......Page 422
Art. 665: Induction and dielectric heating equipment......Page 424
Art. 727: Instrumentation tray cable, type ITC......Page 425
CABLE TRAY WIDTH AND CONDUCTOR AMPACITY......Page 426
Art. 427......Page 432
Art. 727......Page 433
Art. 770......Page 434
WORKSHEET NO. 12—Beginning......Page 436
WORKSHEET NO. 12—Advanced......Page 441
Art. 372: Cellular concrete floor raceways......Page 447
Art. 380: Multioutlet assembly......Page 448
Art. 384: Strut-type channel raceway......Page 449
Art. 600: Electric signs and outline lighting......Page 451
Art. 620: Elevators, dumbwaiters, escalators, moving walks, platform lifts, and stairway chairlifts......Page 452
Art. 647: Sensitive electronic equipment......Page 454
Art. 518......Page 458
Art. 600......Page 459
Art. 604......Page 460
Art. 620......Page 461
Art. 647......Page 462
WORKSHEET NO. 13—Beginning......Page 463
WORKSHEET NO. 13—Advanced......Page 468
Art. 520: Theaters, audience areas of motion picture and television studios, performance areas, and similar locations......Page 473
Art. 525: Carnivals, circuses, fairs, and similar events......Page 475
Art. 547: Agricultural buildings......Page 476
Art. 553: Floating buildings......Page 479
Art. 625: Electric vehicle charging system......Page 480
Art. 626: Electrified truck parking spaces......Page 481
Art. 682: Natural and artificially made bodies of water......Page 482
Art. 800: Communications circuits......Page 483
Art. 520......Page 485
Art. 522......Page 486
Art. 547......Page 487
Art. 555......Page 488
Art. 626......Page 489
Art. 800......Page 490
Art. 830......Page 491
WORKSHEET NO. 14—Beginning......Page 492
WORKSHEET NO. 14—Advanced......Page 496
EVALUATION PROCESS......Page 501
WORKSHEET NO. 15—Beginning......Page 502
WORKSHEET NO. 15—Advanced......Page 511
Annexes, Metric Conversion Tables......Page 521
Answer Sheets......Page 523
A......Page 525
E......Page 527
I......Page 528
O......Page 529
Z......Page 530