CONTENTS

1 9 Chapter 1 12I. 12II. Over 600 Volts, 19110 Requirements for Electrical 20I. 20II. 600 Volts, Nominal, or 25 III. Over 600 Volts, 27IV. Tunnel Installations over 600 Volts, 29V. Manholes and Other ElectricEnclosures Intended for PersonnelEntry, All 30 Chapter 2 Wiring and Protection200 Use and Identification of 32210 Branch 34I. General 34II. Branch-Circuit 38 III. Required 44220 Branch-Circuit, Feeder, and 47I. 47II. Branch-Circuit Load 47 III. Feeder and Service 50IV. Optional Feeder and Service 53V. Farm Load 56225 Outside Branch Circuits and 57I. 57II. More Than One Building or 59 III. Over 600 63I. 63II. Overhead Service-Drop 64 III. Underground 65IV. Service-Entrance 65V. Service Equipment 68VI. Service Equipment Disconnecting 68 VII. Service Equipment 70 VIII.

2 Services Exceeding 600 Volts, 71 ARTICLE240 Overcurrent 72I. 72II. Location. [ROP 10 16]..70 76 III. 79IV. Disconnecting and 80V. Plug Fuses, Fuseholders, 80VI. Cartridge Fuses and 81 VII. Circuit 81 VIII. Supervised Industrial 82IX. Overcurrent Protection Over 600 Volts, 84250 Grounding and 84I. 84II. System 88 III. Grounding Electrode System andGrounding Electrode 95IV. Enclosure, Raceway, and ServiceCable Connections [ROP 5 61]..70 99V. 99VI. Equipment Grounding andEquipment Grounding 103 VII. Methods of Equipment 107 VIII. Direct-Current 110IX. Instruments, Meters, and 111X. Grounding of Systems and Circuitsof 1 kV and Over (High Voltage)..70 111280 Surge Arresters, Over 1 kV [ROP 5 335]..70 113I. 113II. 114 III. Connecting Surge 114285 Surge-Protective Devices (SPDs), 1 kV orLess [ROP 5 349].

3 70 115I. 115II. 115 III. Connecting SPDs.[ROP 5 349]..70 115 Chapter 3 Wiring Methods and Materials300 Wiring 117I. General 117II. Requirements for Over 600 Volts, 126310 Conductors for General 128312 Cabinets, Cutout Boxes, and Meter 155I. 155II. Construction 156314 Outlet, Device, Pull, and Junction Boxes;Conduit Bodies; Fittings; and 158I. Scope and 158II. 159 CONTENTS2008 EditionNATIONAL ELECTRICAL CODE1 DRAFTE ditionARTICLEIII. Construction 165IV. Pull and Junction Boxes for Use onSystems Over 600 Volts, 166320 Armored Cable: Type 167I. 167II. 167 III. Construction 168322 Flat Cable Assemblies: Type 168I. 168II. 168 III. 169324 Flat Conductor Cable: Type 169I. 169II. 170 III. 171326 Integrated Gas Spacer Cable: Type 171I. 171II. 171 III. Construction 172328 Medium Voltage Cable: Type 172I.

4 172II. 173 III. Construction 173330 Metal-Clad Cable: Type 173I. 173II. 173 III. Construction 175332 Mineral-Insulated, Metal-Sheathed Cable:Type 175I. 175II. 175 III. Construction 176334 Nonmetallic-Sheathed Cable: Types NM,NMC, and 176I. 176II. 176 III. Construction 179336 Power and Control Tray Cable: Type 179I. 179II. 179 III. Construction 180338 Service-Entrance Cable: Types SE 180I. 180II. 180 III. 181340 Underground Feeder and Branch-CircuitCable: Type 181I. 181II. 182 ARTICLEIII. Construction 182342 Intermediate Metal Conduit: Type 182I. 182II. 182 III. Construction 184344 Rigid Metal Conduit: Type 184I. 184II. 184 III. Construction 186348 Flexible Metal Conduit: Type 186I. 186II. 186350 Liquidtight Flexible Metal Conduit: 188I. 188II. 188 III.

5 Construction 189352 Rigid Polyvinyl Chloride Conduit: TypePVC [ROP 8 53]..70 189I. 189II. 189 III. Construction 191353 High Density Polyethylene Conduit: TypeHDPE 192I. 192II. 192 III. Construction 193354 Nonmetallic Underground Conduit withConductors: Type 193I. 193II. 193 III. Construction 194355 Reinforced Thermosetting Resin Conduit:Type RTRC [ROP 8 78]..70 195I. 195II. 195 III. Construction 196356 Liquidtight Flexible Nonmetallic Conduit:Type 197I. 197II. 198 III. Construction 199358 Electrical Metallic Tubing: Type 199I. 199II. 199 III. Construction 200360 Flexible Metallic Tubing: Type 201I. 201II. 201 III. Construction 202362 Electrical Nonmetallic Tubing: Type 202I. 202II. 202 CONTENTS2008 EditionNATIONAL ELECTRICAL CODE2 DRAFTE ditionARTICLEIII. Construction 204366 Auxiliary 204I.

6 204II. 204 III. Construction 206I. General 206II. 206 III. 208IV. Requirements for Over 600 Volts, 209372 Cellular Concrete Floor 210374 Cellular Metal Floor 211I. 211II. Construction 211376 Metal 212I. 212II. 212 III. Construction 213378 Nonmetallic 213I. 213II. 213 III. Construction 214380 Multioutlet 214382 Nonmetallic 215I. 215II. 215 III. Construction Specifications(Concealable NonmetallicExtensions only) [ROP 7 98]..70 216384 Strut-Type Channel 217I. 217II. 217 III. Construction 218386 Surface Metal 218I. 218II. 218 III. Construction 219388 Surface Nonmetallic 219I. 219II. 219 III. Construction 220390 Underfloor 220392 Cable 221I. General [ROP 8 180]..70 221II. Installation [ROP 8 180]..70 221 III. Construction 228 ARTICLE394 Concealed Knob-and-Tube 228I.

7 228II. 228 III. Construction 229396 Messenger Supported 229I. 229II. 229398 Open Wiring on 230I. 230II. 230 III. Construction 232 Chapter 4 Equipment for General Use400 Flexible Cords and 233I. 233II. Construction 243 III. Portable Cables Over 600 Volts, 244402 Fixture 249I. 249II. Construction 252406 Receptacles, Cord Connectors, andAttachment Plugs (Caps)..70 252408 Switchboards and 255I. 255II. 256 III. 257IV. Construction 258409 Industrial Control 259I. 259II. 259 III. Construction 260410 Luminaires, Lampholders, and 261I. 261II. Luminaire Locations [ROP 18-70]..70 262 III. Provisions at Luminaire OutletBoxes, Canopies, and 263IV. Luminaire 264V. 264VI. Wiring of 265 VII. Construction of 267 VIII. Installation of 268IX. Construction of 268X. Lamps and Auxiliary 268XI.

8 Special Provisions for Flush andRecessed 268 XII. Construction of Flush and RecessedLuminaires[ROP 18-43]..70 269 XIII. Special Provisions forElectric-Discharge Lighting Systemsof 1000 Volts or 269 CONTENTS2008 EditionNATIONAL ELECTRICAL CODE3 DRAFTE ditionARTICLEXIV. Special Provisions forElectric-Discharge Lighting Systemsof More Than 1000 270XV. Lighting 271 XVI. Decorative Lighting and 272411 Lighting Systems Operating at 30 Volts 273I. 273II. 273 III. Disconnecting 276IV. 276V. 278424 Fixed Electric Space-Heating 278I. 278II. 278 III. Control and Protection of FixedElectric Space-Heating 279IV. Marking of Heating 281V. Electric Space-Heating 281VI. Duct 283 VII. Resistance-Type 283 VIII. Electrode-Type 284IX. Electric Radiant Heating Panels andHeating Panel 285426 Fixed Outdoor Electric Deicing andSnow-Melting 287I.

9 287II. 287 III. Resistance Heating 288IV. Impedance 289V. Skin-Effect 289VI. Control and 289427 Fixed Electric Heating Equipment forPipelines and 290I. 290II. 291 III. Resistance Heating 291IV. Impedance 292V. Induction 292VI. Skin-Effect 292 VII. Control and 293430 Motors, Motor Circuits, and 293I. 293II. Motor Circuit 299 III. Motor and Branch-Circuit 301IV. Motor Branch-Circuit Short-Circuitand Ground-Fault 305V. Motor Feeder Short-Circuit andGround-Fault 308VI. Motor Control 308 VII. Motor 310 VIII. Motor Control 312IX. Disconnecting 313X. Adjustable-Speed Drive 316 ARTICLEXI. Over 600 Volts, 317 XII. Protection of Live Parts 317 XIII. Grounding All 318 XIV. 319440 Air-Conditioning and 323I. 323II. Disconnecting 325 III. Branch-Circuit Short-Circuit andGround-Fault 326IV.

10 Branch-Circuit 327V. Controllers for 328VI. Motor-Compressor andBranch-Circuit Overload 328 VII. Provisions for Room 330450 Transformers and Transformer Vaults(Including Secondary Ties)..70 331I. General 331II. Specific Provisions Applicable toDifferent Types of 336 III. Transformer 337455 Phase 339I. 339II. Specific Provisions Applicable toDifferent Types of Phase 340I. 600 Volts, Nominal, and 340II. Over 600 Volts, 341470 Resistors and 342I. 600 Volts, Nominal, and 342II. Over 600 Volts, 342480 Storage 343490 Equipment, Over 600 Volts, 344I. 344II. Equipment Specific 344 III. Equipment Metal-EnclosedPower Switchgear and IndustrialControl 346IV. Mobile and Portable 349V. Electrode-Type 350 Chapter 5 Special Occupancies500 Hazardous (Classified) Locations, ClassesI, II, and III, Divisions 1 and 351501 Class I 360I.