Stay competitive and up-to-code! The 2005 NFPA 70: National Electrical Code ® is today's blueprint for electrical fire safety. Reduce the risk of fire and electric shock hazards, and boost confidence in your electrical installations with the 2005 National Electrical Code . Already directly adopted in many states, this important NEC ® edition is fully up-to-date with industry practices, new equipment, and advancements in technology. It's the vital link between electrical equipment installation and safe use by consumers. Major revisions in the 2005 NEC work to improve protection of people and property : Expanded requirements for ground-fault circuit-interrupters (GFCI) call for wider use of these devices in homes, businesses, and public spaces New requirements for arc-fault circuit-interrupters (AFCI) First-time Article 409 introduces rules for industrial control panels First-time Article 506 presents a zone hazardous area classification system for combustible dusts and ignitible fibers and flyings First-time Article 682 covers natural and artificially made bodies of water not classified as swimming pools or fountains First-time Article 353 governs installations using HDPE conduit Reorganized electrical calculation requirements in Article 220: Branch Circuit, Feeder and Service Calculations New requirements for identification of ungrounded branch circuit and feeder conductors protect electricians and maintenance personnel Developed by NFPA, the National Electrical Code has long been the world's most widely adopted safety code. Order the 2005 edition of the NEC direct from the source! This Softbound edition is the #1 choice of contractors and installers industrywide. (Softbound, 792 pages, 2005) TABLE OF CONTENTS NFPA 70 National Electrical Code 2005 Edition ARTICLE 90 Introduction Chapter 1 General ARTICLE 100 Definitions I. General II. Over 600 Volts, Nominal ARTICLE 110 Requirements for Electrical Installations I. General II. 600 Volts, Nominal, or Less III. Over 600 Volts, Nominal IV. Tunnel Installations over 600 Volts, Nominal V. Manholes and Other Electric Enclosures Intended for Personnel Entry, All Voltages Chapter 2 Wiring and Protection ARTICLE 200 Use and Identification of Grounded Conductors ARTICLE 210 Branch Circuits I. General Provisions II. Branch-Circuit Ratings III. Required Outlets ARTICLE 215 Feeders ARTICLE 220 Branch-Circuit, Feeder, and Service Calculations I. General II. Branch Circuit Load Calculations III. Feeder and Service Load Calculations IV. Optional Feeder and Service Load Calculations V. Farm Load Calculation ARTICLE 225 Outside Branch Circuits and Feeders I. General II. More Than One Building or Other Structure III. Over 600 Volts ARTICLE 230 Services I. General II. Overhead Service-Drop Conductors III. Underground Service-Lateral Conductors IV. Service-Entrance Conductors V. Service Equipment - General VI. Service Equipment - Disconnecting Means VII. Service Equipment - Overcurrent Protection VIII. Services Exceeding 600 Volts, Nominal ARTICLE 240 Overcurrent Protection I. General II. Location III. Enclosures IV. Disconnecting and Guarding V. Plug Fuses, Fuseholders, and Adapters VI. Cartridge Fuses and Fuseholders VII. Circuit Breakers VIII. Supervised Industrial Installations IX. Overcurrent Protection Over 600 Volts, Nominal ARTICLE 250 Grounding and Bonding I. General II. System Grounding III. Grounding Electrode System and Grounding Electrode Conductor IV. Enclosure, Raceway, and Service Cable Grounding V. Bonding VI. Equipment Grounding and Equipment Grounding Conductors VII. Methods of Equipment Grounding VIII. Direct-Current Systems IX. Instruments, Meters, and Relays X. Grounding of Systems and Circuits of 1 kV and Over (High Voltage) ARTICLE 280 Surge Arresters I. General II. Installation III. Connecting Surge Arresters ARTICLE 285 Transient Voltage Surge Suppressors: TVSSs I. General II. Installation III. Connecting Transient Voltage Surge Suppressors Chapter 3 Wiring Methods and Materials ARTICLE 300 Wiring Methods I. General Requirements II. Requirements for Over 600 Volts, Nominal ARTICLE 310 Conductors for General Wiring ARTICLE 312 Cabinets, Cutout Boxes, and Meter Socket Enclosures I. Installation II. Construction Specifications ARTICLE 314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures I. Scope and General II. Installation III. Construction Specifications IV. Pull and Junction Boxes for Use on Systems Over 600 Volts, Nominal ARTICLE 320 Armored Cable: Type AC I. General II. Installation III. Construction Specifications ARTICLE 322 Flat Cable Assemblies: Type FC I. General II. Installation III. Construction ARTICLE 324 Flat Conductor Cable: Type FCC I. General II. Installation III. Construction ARTICLE 326 Integrated Gas Spacer Cable: Type IGS I. General II. Installation III. Construction Specifications ARTICLE 328 Medium Voltage Cable: Type MV I. General II. Installation III. Construction Specifications ARTICLE 330 Metal-Clad Cable: Type MC I. General II. Installation III. Construction Specifications ARTICLE 332 Mineral-Insulated, Metal-Sheathed Cable: Type MI I. General II. Installation III. Construction Specifications ARTICLE 334 Nonmetallic-Sheathed Cable: Types NM, NMC, and NMS I. General II. Installation III. Construction Specifications ARTICLE 336 Power and Control Tray Cable: Type TC I. General II. Installation III. Construction Specifications ARTICLE 338 Service-Entrance Cable: Types SE and USE I. General II. Installation III. Construction ARTICLE 340 Underground Feeder and Branch-Circuit Cable: Type UF I. General II. Installation III. Construction Specifications ARTICLE 342 Intermediate Metal Conduit: Type IMC I. General II. Installation III. Construction Specifications ARTICLE 344 Rigid Metal Conduit: Type RMC I. General II. Installation III. Construction Specifications ARTICLE 348 Flexible Metal Conduit: Type FMC I. General II. Installation ARTICLE 350 Liquidtight Flexible Metal Conduit: Type LFMC I. General II. Installation III. Construction Specifications ARTICLE 352 Rigid Nonmetallic Conduit: Type RNC I. General II. Installation III. Construction Specifications ARTICLE 353 High Density Polyethylene Conduit: Type HDPE Conduit I. General II. Installation III. Construction Specifications ARTICLE 354 Nonmetallic Underground Conduit with Conductors: Type NUCC I. General II. Installation III. Construction Specifications ARTICLE 356 Liquidtight Flexible Nonmetallic Conduit: Type LFNC I. General II. Installation III. Construction Specifications ARTICLE 358 Electrical Metallic Tubing: Type EMT I. General II. Installation III. Construction Specifications ARTICLE 360 Flexible Metallic Tubing: Type FMT I. General II. Installation III. Construction Specifications ARTICLE 362 Electrical Nonmetallic Tubing: Type ENT I. General II. Installation III. Construction Specifications ARTICLE 366 Auxiliary Gutters I. General II. Installation III. Construction Specifications ARTICLE 368 Busways I. General Requirements II. Installation III. Construction IV. Requirements for Over 600 Volts, Nominal ARTICLE 370 Cablebus ARTICLE 372 Cellular Concrete Floor Raceways ARTICLE 374 Cellular Metal Floor Raceways I. Installation II. Construction Specifications ARTICLE 376 Metal Wireways I. General II. Installation III. Construction Specifications ARTICLE 378 Nonmetallic Wireways I. General II. Installation III. Construction Specifications ARTICLE 380 Multioutlet Assembly ARTICLE 382 Nonmetallic Extensions I. General II. Installation ARTICLE 384 Strut-Type Channel Raceway I. General II. Installation III. Construction Specifications ARTICLE 386 Surface Metal Raceways I. General II. Installation III. Construction Specifications ARTICLE 388 Surface Nonmetallic Raceways I. General II. Installation III. Construction Specifications ARTICLE 390 Underfloor Raceways ARTICLE 392 Cable Trays ARTICLE 394 Concealed Knob-and-Tube Wiring I. General II. Installation III. Construction Specifications ARTICLE 396 Messenger Supported Wiring I. General II. Installation ARTICLE 398 Open Wiring on Insulators I. General II. Installation III. Construction Specifications Chapter 4 Equipment for General Use ARTICLE 400 Flexible Cords and Cables I. General II. Construction Specifications III. Portable Cables Over 600 Volts, Nominal ARTICLE 402 Fixture Wires ARTICLE 404 Switches I. Installation II. Construction Specifications ARTICLE 406 Receptacles, Cord Connectors, and Attachment Plugs (Caps) ARTICLE 408 Switchboards and Panelboards I. General II. Switchboards III. Panelboards IV. Construction Specifications ARTICLE 409 Industrial Control Panels I. General II. Installation III. Construction Specifications ARTICLE 410 Luminaires (Lighting Fixtures), Lampholders, and Lamps I. General II. Luminaire (Fixture) Locations III. Provisions at Luminaire (Fixture) Outlet Boxes, Canopies, and Pans IV. Luminaire (Fixture) Supports V. Grounding VI. Wiring of Luminaires (Fixtures) VII. Construction of Luminaires (Fixtures) VIII. Installation of Lampholders IX. Construction of Lampholders X. Lamps and Auxiliary Equipment XI. Special Provisions for Flush and Recessed Luminaires (Fixtures) XII. Construction of Flush and Recessed Luminaires (Fixtures) XIII. Special Provisions for Electric-Discharge Lighting Systems of 1000 Volts or Less XIV. Special Provisions for Electric-Discharge Lighting Systems of More Than 1000 Volts XV. Lighting Track XVI. Decorative Lighting and Similar Accessories ARTICLE 411 Lighting Systems Operating at 30 Volts or Less ARTICLE 422 Appliances I. General II. Installation III. Disconnecting Means IV. Construction V. Marking ARTICLE 424 Fixed Electric Space-Heating Equipment I. General II. Installation III. Control and Protection of Fixed Electric Space-Heating Equipment IV. Marking of Heating Equipment V. Electric Space-Heating Cables VI. Duct Heaters VII. Resistance-Type Boilers VIII. Electrode-Type Boilers IX. Electric Radiant Heating Panels and Heating Panel Sets ARTICLE 426 Fixed Outdoor Electric Deicing and Snow-Melting Equipment I. General II. Installation III. Resistance Heating Elements IV. Impedance Heating V. Skin-Effect Heating VI. Control and Protection ARTICLE 427 Fixed Electric Heating Equipment for Pipelines and Vessels I. General II. Installation III. Resistance Heating Elements IV. Impedance Heating V. Induction Heating VI. Skin-Effect Heating VII. Control and Protection ARTICLE 430 Motors, Motor Circuits, and Controllers I. General II. Motor Circuit Conductors III. Motor and Branch-Circuit Overload Protection IV. Motor Branch-Circuit Short-Circuit and Ground-Fault Protection V. Motor Feeder Short-Circuit and Ground-Fault Protection VI. Motor Control Circuits VII. Motor Controllers VIII. Motor Control Centers IX. Disconnecting Means X. Adjustable-Speed Drive Systems XI. Over 600 Volts, Nominal XII. Protection of Live Parts - All Voltages XIII. Grounding - All Voltages XIV. Tables ARTICLE 440 Air-Conditioning and Refrigerating Equipment I. General II. Disconnecting Means III. Branch-Circuit Short-Circuit and Ground-Fault Protection IV. Branch-Circuit Conductors V. Controllers for Motor-Compressors VI. Motor-Compressor and Branch-Circuit Overload Protection VII. Provisions for Room Air Conditioners ARTICLE 445 Generators ARTICLE 450 Transformers and Transformer Vaults (Including Secondary Ties) I. General Provisions II. Specific Provisions Applicable to Different Types of Transformers III. Transformer Vaults ARTICLE 455 Phase Converters I. General II. Specific Provisions Applicable to Different Types of Phase Converters ARTICLE 460 Capacitors I. 600 Volts, Nominal, and Under II. Over 600 Volts, Nominal ARTICLE 470 Resistors and Reactors I. 600 Volts, Nominal, and Under II. Over 600 Volts, Nominal ARTICLE 480 Storage Batteries ARTICLE 490 Equipment, Over 600 Volts, Nominal I. General II. Equipment - Specific Provisions III. Equipment - Metal-Enclosed Power Switchgear and Industrial Control Assemblies IV. Mobile and Portable Equipment V. Electrode-Type Boilers Chapter 5 Special Occupancies ARTICLE 500 Hazardous (Classified) Locations, Classes I, II, and III, Divisions 1 and 2 ARTICLE 501 Class I Locations I. General II. Wiring III. Equipment ARTICLE 502 Class II Locations I. General II. Wiring III. Equipment ARTICLE 503 Class III Locations I. General II. Wiring III. Equipment ARTICLE 504 Intrinsically Safe Systems ARTICLE 505 Class I, Zone 0, 1, and 2 Locations ARTICLE 506 Zone 20, 21, and 22 Locations for Combustible Dusts, Fibers, and Flyings ARTICLE 510 Hazardous (Classified) Locations - Specific ARTICLE 511 Commercial Garages, Repair and Storage ARTICLE 513 Aircraft Hangars ARTICLE 514 Motor Fuel Dispensing Facilities ARTICLE 515 Bulk Storage Plants ARTICLE 516 Spray Application, Dipping, and Coating Processes ARTICLE 517 Health Care Facilities I. General II. Wiring and Protection III. Essential Electrical System IV. Inhalation Anesthetizing Locations V. X-Ray Installations VI. Communications, Signaling Systems, Data Systems, Fire Alarm Systems, and Systems Less Than 120 Volts, Nominal VII. Isolated Power Systems ARTICLE 518 Assembly Occupancies ARTICLE 520 Theaters, Audience Areas of Motion Picture and Television Studios, Performance Areas, and Similar Locations I. General II. Fixed Stage Switchboards III. Fixed Stage Equipment Other Than Switchboards IV. Portable Switchboards on Stage V. Portable Stage Equipment Other Than Switchboards VI. Dressing Rooms VII. Grounding ARTICLE 525 Carnivals, Circuses, Fairs, and Similar Events I. General Requirements II. Power Sources III. Wiring Methods IV. Grounding and Bonding ARTICLE 530 Motion Picture and Television Studios and Similar Locations I. General II. Stage or Set III. Dressing Rooms IV. Viewing, Cutting, and Patching Tables V. Cellulose Nitrate Film Storage Vaults VI. Substations ARTICLE 540 Motion Picture Projection Rooms I. General II. Equipment and Projectors of the Professional Type III. Nonprofessional Projectors IV. Audio Signal Processing, Amplification, and Reproduction Equipment ARTICLE 545 Manufactured Buildings ARTICLE 547 Agricultural Buildings ARTICLE 550 Mobile Homes, Manufactured Homes, and Mobile Home Parks I. General II. Mobile and Manufactured Homes III. Services and Feeders ARTICLE 551 Recreational Vehicles and Recreational Vehicle Parks I. General II. Combination Electrical Systems III. Other Power Sources IV. Nominal 120-Volt or 120/240-Volt Systems V. Factory Tests VI. Recreational Vehicle Parks ARTICLE 552 Park Trailers I. General II. Low-Voltage Systems III. Combination Electrical Systems IV. Nominal 120-Volt or 120/240-Volt Systems V. Factory Tests ARTICLE 553 Floating Buildings I. General II. Services and Feeders III. Grounding ARTICLE 555 Marinas and Boatyards ARTICLE 590 Temporary Installations Chapter 6 Special Equipment ARTICLE 600 Electric Signs and Outline Lighting I. General II. Field-Installed Skeleton Tubing ARTICLE 604 Manufactured Wiring Systems ARTICLE 605 Office Furnishings (Consisting of Lighting Accessories and Wired Partitions) ARTICLE 610 Cranes and Hoists I. General II. Wiring III. Contact Conductors IV. Disconnecting Means V. Overcurrent Protection VI. Control VII. Grounding ARTICLE 620 Elevators, Dumbwaiters, Escalators, Moving Walks, Wheelchair Lifts, and Stairway Chair Lifts I. General II. Conductors III. Wiring IV. Installation of Conductors V. Traveling Cables VI. Disconnecting Means and Control VII. Overcurrent Protection VIII. Machine Rooms, Control Rooms, Machinery Spaces, and Control Spaces IX. Grounding X. Emergency and Standby Power Systems ARTICLE 625 Electric Vehicle Charging System I. General II. Wiring Methods III. Equipment Construction IV. Control and Protection V. Electric Vehicle Supply Equipment Locations ARTICLE 630 Electric Welders I. General II. Arc Welders III. Resistance Welders IV. Welding Cable ARTICLE 640 Audio Signal Processing, Amplification, and Reproduction Equipment I. General II. Permanent Audio System Installations III. Portable and Temporary Audio System Installations ARTICLE 645 Information Technology Equipment ARTICLE 647 Sensitive Electronic Equipment ARTICLE 650 Pipe Organs ARTICLE 660 X-Ray Equipment I. General II. Control III. Transformers and Capacitors IV. Guarding and Grounding ARTICLE 665 Induction and Dielectric Heating Equipment I. General II. Guarding, Grounding, and Labeling ARTICLE 668 Electrolytic Cells ARTICLE 669 Electroplating ARTICLE 670 Industrial Machinery ARTICLE 675 Electrically Driven or Controlled Irrigation Machines I. General II. Center Pivot Irrigation Machines ARTICLE 680 Swimming Pools, Fountains, and Similar Installations I. General II. Permanently Installed Pools III. Storable Pools IV. Spas and Hot Tubs V. Fountains VI. Pools and Tubs for Therapeutic Use VII. Hydromassage Bathtubs ARTICLE 682 Natural and Artificially Made Bodies of Water I. General II. Installation III. Grounding and Bonding ARTICLE 685 Integrated Electrical Systems I. General II. Orderly Shutdown ARTICLE 690 Solar Photovoltaic Systems I. General II. Circuit Requirements III. Disconnecting Means IV. Wiring Methods V. Grounding VI. Marking VII. Connection to Other Sources VIII. Storage Batteries IX. Systems Over 600 Volts ARTICLE 692 Fuel Cell Systems I. General II. Circuit Requirements III. Disconnecting Means IV. Wiring Methods V. Grounding VI. Marking VII. Connection to Other Circuits VIII. Outputs Over 600 Volts ARTICLE 695 Fire Pumps Chapter 7 Special Conditions ARTICLE 700 Emergency Systems I. General II. Circuit Wiring III. Sources of Power IV. Emergency System Circuits for Lighting and Power V. Control - Emergency Lighting Circuits VI. Overcurrent Protection ARTICLE 701 Legally Required Standby Systems I. General II. Circuit Wiring III. Sources of Power IV. Overcurrent Protection ARTICLE 702 Optional Standby Systems I. General II. Circuit Wiring III. Grounding IV. Sources of Power ARTICLE 705 Interconnected Electric Power Production Sources ARTICLE 720 Circuits and Equipment Operating at Less Than 50 Volts ARTICLE 725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits I. General II. Class 1 Circuits III. Class 2 and Class 3 Circuits IV. Listing Requirements ARTICLE 727 Instrumentation Tray Cable: Type ITC ARTICLE 760 Fire Alarm Systems I. General II. NonPower-Limited Fire Alarm (NPLFA) Circuits III. Power-Limited Fire Alarm (PLFA) Circuits IV. Listing Requirements ARTICLE 770 Optical Fiber Cables and Raceways I. General II. Protection III. Cables Within Buildings IV. Listing Requirements ARTICLE 780 Closed-Loop and Programmed Power Distribution Chapter 8 Communications Systems ARTICLE 800 Communications Circuits I. General II. Wires and Cables Outside and Entering Buildings III. Protection IV. Grounding Methods V. Communications Wires and Cables Within Buildings VI. Listing Requirements ARTICLE 810 Radio and Television Equipment I. General II. Receiving Equipment - Antenna Systems III. Amateur Transmitting and Receiving Stations - Antenna Systems IV. Interior Installation - Transmitting Stations ARTICLE 820 Community Antenna Television and Radio Distribution Systems I. General II. Cables Outside and Entering Buildings III. Protection IV. Grounding Methods V. Cables Within Buildings VI. Listing Requirements ARTICLE 830 Network-Powered Broadband Communications Systems I. General II. Cables Outside and Entering Buildings III. Protection IV. Grounding Methods V. Wiring Methods Within Buildings VI. Listing Requirements Chapter 9 Tables Annex A Product Safety Standards Annex B Application Information for Ampacity Calculation Annex C Conduit and Tubing Fill Tables for Conductors and Fixture Wires of the Same Size Annex D Examples Annex E Types of Construction Annex F Cross-Reference Tables Annex G Administration and Enforcement Formal Interpretation Tentative Interim Amendment Index