About This Textbook...xi About the National Electrical Code...xv About the Authors and Illustrator...xix About the Team...xxi Article 90 Introduction to the National Electrical Code... 1 90.1 Purpose of the NEC... 2 Chapter 1 General... 5 Article 100 Definitions...7 Accessible, Readily (Readily Accessible)... 8 Adjustable Speed Drive... 8 Adjustable Speed Drive System...9 Cable Routing Assembly...9 Communications Equipment...10 Communications Raceway...10 Concealed...11 Control Circuit...11 Coordination (Selective)...12 Device...13 Effective Ground-Fault Current Path... 13 Electric-Discharge Lighting...14 Exposed (as applied to live parts)... 15 Ground-Fault Current Path...15 Grounding Conductor, Equipment (EGC)... 16 Hermetic Refrigerant Motor-Compressor... 17 Intersystem Bonding Termination... 17 Lighting Track (Track Lighting)... 17 Location, Damp...18 Premises Wiring...18 Raceway...19 Retrofit Kit...20 Sealable Equipment... 20 Separately Derived System... 20 Voltage, Nominal... 21 Article 110 Requirements for Electrical Installations... 23 110.1 Scope... 23 110.14 Conductor Termination and Splicing... 24 110.16 Arc-Flash Hazard Warning... 25 110.21 Markings... 26 110.22 Identification of Disconnecting Means... 27 110.24 Available Fault Current... 27 110.25 Lockable Disconnecting Means... 28 110.26 Spaces About Electrical Equipment... 29 110.27 Guarding... 36 Chapter 2 Wiring and Protection... 37 Article 200 Use and Identification of Grounded [Neutral] Conductors... 39 200.4 Neutral Conductors... 40 200.6 Neutral Conductor Identification... 41 Article 210 Branch Circuits... 43 210.4 Multiwire Branch Circuits... 44 210.8 GFCI Protection... 45 210.12 Arc-Fault Circuit-Interrupter Protection... 49 210.17 Electric Vehicle Branch Circuit... 51 210.19 Conductor Sizing... 52 210.22 Permissible Loads, Individual Branch Circuits... 53 210.50 General... 53 210.52 Dwelling Unit Receptacle Outlet Requirements... 54 210.62 Show Windows... 58 210.64 Electrical Service Areas... 58 Article 215 Feeders... 61 215.2 Minimum Rating... 61 Mike Holt Enterprises, Inc. www.mikeholt.com 888.NEC.CODE (632.2633) v
Article 220 Branch-Circuit, Feeder, and Service Calculations...65 220.3 Application of Other Articles... 65 220.12 General Lighting...66 220.14 Other Loads All Occupancies... 67 Article 225 Outside Branch Circuits and Feeders...69 225.17 Masts as Supports...69 225.27 Raceway Seal...71 225.36 Type...71 Article 230 Services... 73 230.6 Conductors Considered Outside a Building... 74 230.26 Point of Attachment...75 230.28 Service Masts Used as Supports... 75 230.42 Size and Rating...77 Article 240 Overcurrent Protection... 79 240.21 Overcurrent Protection Location in Circuit... 80 Article 250 Grounding and Bonding... 83 250.8 Termination of Grounding and Bonding Conductors... 83 250.10 Protection of Fittings... 84 250.21 Ungrounded Systems 50V to 1,000V... 84 250.24 Service Equipment Grounding and Bonding... 85 250.62 Grounding Electrode Conductor... 85 250.64 Grounding Electrode Conductor Installation... 86 250.66 Sizing Grounding Electrode Conductor... 89 250.68 Termination to the Grounding Electrode... 90 250.100 Bonding in Hazardous (Classified) Locations... 92 250.102 Bonding Conductors and Jumpers... 92 250.119 Identification of Equipment Grounding Conductors... 94 250.121 Use of Equipment Grounding Conductors... 96 250.122 Sizing Equipment Grounding Conductor... 97 250.130 Replacing Nongrounding Receptacles... 98 Article 285 Surge Protective Devices (SPDs)... 101 285.1 Scope...102 285.13 Type 4 and Other Component Type SPDs... 102 Chapter 3 Wiring Methods and Materials... 103 Article 300 General Requirements for Wiring Methods and Materials... 107 300.1 Scope... 107 300.5 Underground Installations... 108 300.6 Protection Against Corrosion and Deterioration... 109 300.22 Wiring in Ducts Not for Air Handling, Fabricated Ducts for Environmental Air, and Other Spaces for Environmental Air (Plenums)... 109 Article 310 Conductors for General Wiring... 113 310.15 Conductor Ampacity... 114 Article 312 Cabinets, Cutout Boxes, and Meter Socket Enclosures... 125 312.5 Enclosures... 125 312.8 Enclosures With Splices, Taps, and Feed-Through Conductors... 126 Article 314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; and Handhole Enclosures... 129 314.15 Damp or Wet Locations... 129 314.17 Conductors That Enter Boxes or Conduit Bodies... 130 314.23 Support of Boxes and Conduit Bodies... 130 314.25 Covers and Canopies... 131 314.27 Outlet Box... 132 314.29 Wiring to be Accessible... 134 Article 320 Armored Cable (Type AC)... 135 320.23 In Accessible Attics or Roof Spaces... 135 Article 330 Metal-Clad Cable (Type MC)... 137 330.10 Uses Permitted... 137 330.30 Securing and Supporting... 138 Article 334 Nonmetallic-Sheathed Cable (Types NM and NMC)... 141 334.10 Uses Permitted... 141 334.12 Uses Not Permitted... 142 vi Mike Holt s Illustrated Guide to Changes to the NEC 2014
Article 338 Service-Entrance Cable (Types SE and USE)... 145 338.10 Uses Permitted...145 Article 344 Rigid Metal Conduit (Type RMC)... 147 344.30 Securing and Supporting... 147 344.100 Construction...148 Article 348 Flexible Metal Conduit (Type FMC)... 149 348.30 Securing and Supporting... 149 Article 350 Liquidtight Flexible Metal Conduit (Type LFMC)...151 350.30 Securing and Supporting... 151 350.42 Fittings...152 Article 352 Rigid Polyvinyl Chloride Conduit (Type PVC)...153 352.2 Definition Rigid Polyvinyl Chloride Conduit (PVC)... 153 Article 356 Liquidtight Flexible Nonmetallic Conduit (Type LFNC)...155 356.30 Securing and Supporting... 155 Article 376 Metal Wireways... 157 376.22 Number of Conductors and Ampacity... 157 376.56 Splices, Taps, and Power Distribution Blocks... 158 Article 386 Surface Metal Raceways... 161 386.30 Securing and Supporting... 161 Article 392 Cable Trays... 163 392.60 Equipment Grounding Conductor... 163 Article 393 Low Voltage Suspended Ceiling Power Distribution Systems... 165 Chapter 4 Equipment for General Use...167 Article 400 Flexible Cords and Flexible Cables... 169 400.23 Equipment Grounding Conductor Identification... 169 Article 404 Switches... 171 404.2 Switch Connections... 171 404.10 Mounting Snap Switches... 173 Article 406 Receptacles, Cord Connectors, and Attachment Plugs (Caps)... 175 406.3 Receptacle Rating and Type... 175 406.4 General Installation Requirements... 176 406.5 Receptacle Mounting... 177 406.9 Receptacles in Damp or Wet Locations... 178 406.12 Tamper-Resistant Receptacles... 180 406.15 Dimmer-Controlled Receptacles... 181 Article 408 Switchboards and Panelboards... 183 408.4 Field Identification... 183 Article 410 Luminaires, Lampholders, and Lamps... 185 410.6 Listing Required... 185 410.10 Luminaires in Specific Locations... 186 410.130 General... 186 410.151 Installation... 187 Article 411 Lighting Systems Operating at 30V or Less and Lighting Equipment Connected to Class-2 Power Sources... 189 Article 422 Appliances... 191 422.5 Ground-Fault Circuit-Interrupter (GFCI) Protection... 191 422.16 Flexible Cords... 191 422.19 Space for Conductors... 192 422.20 Outlet Boxes to Be Covered... 192 422.21 Covering of Combustible Material at Outlet Boxes... 192 422.23 Tire Inflation and Automotive Vacuum Machines... 193 422.51 Vending Machines... 193 Article 430 Motors, Motor Circuits, and Controllers... 195 430.102 Disconnect Requirement... 195 Article 440 Air-Conditioning and Refrigeration Equipment... 197 440.14 Location... 197 Mike Holt Enterprises, Inc. www.mikeholt.com 888.NEC.CODE (632.2633) vii
Article 445 Generators...199 445.11 Marking...199 445.16 Bushings...200 445.20 Ground-Fault Circuit Interrupter Protection for Receptacles on 15 kw or Smaller Portable Generators... 201 Article 450 Transformers... 203 450.10 Grounding and Bonding...203 450.11 Marking...204 450.14 Disconnecting Means...204 Article 525 Carnivals, Circuses, Fairs, and Similar Events... 237 525.32 Equipment Grounding Conductor Continuity Assurance... 237 Article 547 Agricultural Buildings... 239 547.2 Definitions Equipotential Plane... 239 547.5 Wiring Methods... 240 Article 555 Marinas and Boatyards... 241 555.2 Definitions Marine Power Outlet... 241 555.15 Grounding... 242 Chapter 5 Special Occupancies... 207 Article 500 Hazardous (Classified) Locations... 211 500.8 Equipment...212 Article 501 Class I Hazardous (Classified) Locations...213 501.10 Wiring Methods...213 501.15 Raceway and Cable Seals... 216 501.30 Grounding and Bonding...221 501.145 Receptacles and Attachment Plugs... 222 Article 502 Class II Hazardous (Classified) Locations...225 502.10 Wiring Methods...225 502.130 Luminaires...226 502.140 Flexible Cords...227 502.145 Receptacles and Attachment Plugs... 228 Article 503 Class III Hazardous (Classified) Locations...229 503.10 Wiring Methods...229 Article 514 Motor Fuel Dispensing Facilities... 231 514.3 Classification of Locations...231 Article 517 Health Care Facilities... 233 517.2 Definitions Patient Care Space... 234 517.16 Isolated Ground Receptacles... 235 517.18 General Care Areas...235 Article 590 Temporary Installations... 243 590.4 General... 243 590.6 Ground-Fault Protection for Personnel... 244 Chapter 6 Special Equipment... 245 Article 600 Electric Signs and Outline Lighting... 247 600.3 Listing... 247 600.4 Markings... 248 600.6 Disconnecting Means... 248 600.7 Grounding and Bonding... 250 600.21 Ballasts, Transformers, Class 2 Power Sources, and Electronic Power Supplies... 250 Article 620 Elevators, Escalators, and Moving Walks... 253 620.51 Disconnecting Means... 254 Article 640 Audio Signal Processing, Amplification, and Reproduction Equipment... 255 640.1 Scope... 255 640.10 Audio Systems Near Bodies of Water... 256 Article 645 Information Technology Equipment... 257 645.14 System Grounding... 257 viii Mike Holt s Illustrated Guide to Changes to the NEC 2014
Article 646 Modular Data Centers... 259 Article 680 Swimming Pools, Spas, Hot Tubs, Fountains, and Similar Installations... 261 680.2 Definitions Storable Swimming Pool... 262 680.8 Overhead Conductor Clearance... 262 680.11 Equipment Rooms and Pits... 263 680.12 Maintenance Disconnecting Means... 263 680.21 Motors...264 680.22 Lighting, Receptacles, and Equipment... 264 680.26 Equipotential Bonding...266 Part III. Storable Swimming Pools, Storable Spas, and Storable Hot Tubs...267 680.42 Outdoor Installations...267 680.43 Indoor Installations...268 680.57 Signs in or Adjacent to Fountains... 269 680.74 Equipotential Bonding...269 Chapter 7 Special Conditions... 271 Article 700 Emergency Systems... 273 700.8 Surge Protection...273 700.12 General Requirements...274 700.16 Emergency Illumination...276 700.19 Multiwire Branch Circuits...276 700.27 Ground-Fault Protection of Equipment... 277 700.28 Selective Coordination...277 Article 701 Legally Required Standby Systems...279 701.12 General Requirements... 279 701.26 Ground-Fault Protection of Equipment... 280 701.27 Selective Coordination... 280 Article 725 Remote-Control, Signaling, and Power-Limited Circuits... 285 725.3 Other Articles... 285 725.135 Installation of Class 2, Class 3, and PLTC Cables... 286 725.139 Conductors of Different Circuits in the Same Cable, Enclosure, Cable Tray, Raceway, or Cable Routing Assembly... 287 725.154 Applications of Class 2 and Class 3 Cables... 289 Article 760 Fire Alarm Systems... 291 760.3 Other Articles... 291 760.32 Fire Alarm Circuit Cables Extending Beyond a Building... 291 760.135 Installation of PLFA Cables in Buildings... 292 760.139 Power-Limited Fire Alarm Circuits, Class 2, Class 3, and Communications Circuits... 292 760.154 Applications of Power-Limited Fire Alarm Cables (PLFA)... 293 Article 770 Optical Fiber Cables and Raceways... 295 770.2 Definitions Innerduct... 295 770.2 Definitions Optical Fiber Cable... 296 770.2 Definitions Point of Entrance... 296 770.12 Innerduct... 296 770.24 Mechanical Execution of Work... 297 770.48 Unlisted Cables Entering Buildings... 298 770.49 Metallic Entrance Conduit Grounding... 299 770.110 Raceways and Cable Routing Assemblies for Optical Fiber Cables... 299 770.113 Installation of Optical Fiber Cables... 300 770.133 Installation of Optical Fiber Cables... 301 Article 702 Optional Standby Systems... 281 702.7 Signs...281 702.12 Outdoor Generator Sets...282 Mike Holt Enterprises, Inc. www.mikeholt.com 888.NEC.CODE (632.2633) ix
Chapter 8 Communications Systems... 303 Article 800 Communications Circuits... 305 800.2 Definitions Innerduct...306 800.2 Definitions Point of Entrance... 306 800.12 Innerduct...307 800.24 Mechanical Execution of Work... 307 800.49 Metallic Entrance Conduit Grounding... 308 800.110 Raceways and Cable Routing Assemblies for Communications Wires and Cables... 309 800.113 Installation of Communications Cables, Communications Raceways, and Cable Routing Assemblies... 310 800.133 Installation of Communications Cables... 311 800.154 Applications of Communications Cables, Communications Raceways, and Cable Routing Assemblies... 312 Annex J ADA Standards for Accessible Design... 321 final exam for Changes to the NEC 2014... 323 Index... 341 Article 810 Radio and Television Equipment... 315 810.6 Antenna Lead-In Protectors... 315 810.7 Grounding Devices...315 Article 820 Community Antenna Television (CATV) and Radio Distribution Systems... 317 820.2 Definitions Point of Entrance... 317 820.24 Mechanical Execution of Work... 318 820.49 Metallic Entrance Conduit Grounding... 319 820.110 Raceways for Coaxial Cables... 319 x Mike Holt s Illustrated Guide to Changes to the NEC 2014