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Hundreds of changes in the 2017 edition NEC® bring you up-to-code and ready to address new sources of electrical power.
Throughout the United States and around the world, NFPA 70®: National Electrical Code® (NEC) sets the foundation for electrical safety in residential, commercial, and industrial occupancies. The 2017 edition of this trusted Code presents the latest comprehensive regulations for electrical wiring, overcurrent protection, grounding, and installation of equipment.
NFPA 70: NEC has been published since 1897, and a rigorous process of review keeps it up-to-date with new technologies. In fact, more than 4,000 public inputs and 1,500 comments went into the 2017 NEC alone. Hundreds of updates and five all-new articles pave the way to a safe and efficient electrical future.
Major additions reflect the continuing growth in renewable power technology.
The newest NEC addresses the advancement of privately owned wind and solar power generation and distribution equipment -- including coverage of higher voltage systems that were once only the utilities' domain. The new consumer role is a major factor in energy decentralization, and expanded NEC coverage is vital for designers, engineers, contractors, and AHJs.
Other NEC revisions protect the public and workers from deadly hazards.
Be prepared to protect lives and property in the ever-changing electrical landscape. Order the 2017 National Electrical Code.
Work with the latest requirements governing public and private buildings, homes, and structures; outdoor yards and lots; utility equipment; installations that connect to the power grid; and consumer-owned power generation systems and equipment. The 2017 NEC is better aligned with the safe work practices in NFPA 70E®: Standard for Electrical Safety in the Workplace®. (Softbound, 888 pp., 2017)
Interested in other editions of the NEC? Use the drop down menu above to select the edition year you need.
NFPA 70® National Electrical Code®, 2017 Edition
Chapter 1 General 100 Definitions 110 Requirements for Electrical Installations
Chapter 2 Wiring and Protection 200 Use and Identification of Grounded Conductors 210 Branch Circuits 215 Feeders 220 Branch-Circuit, Feeder, and Service Load Calculations 225 Outside Branch Circuits and Feeders 230 Services 240 Overcurrent Protection 250 Grounding and Bonding 280 Surge Arresters, Over 1000 Volts 285 Surge-Protective Devices (SPDs), 1000 Volts or Less
Chapter 3 Wiring Methods and Materials 300 General Requirements for Wiring Methods and Materials 310 Conductors for General Wiring 312 Cabinets, Cutout Boxes, and Meter Socket Enclosures 314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures 320 Armored Cable: Type AC 322 Flat Cable Assemblies: Type FC 324 Flat Conductor Cable: Type FCC 326 Integrated Gas Spacer Cable: Type IGS 328 Medium Voltage Cable: Type MV 330 Metal-Clad Cable: Type MC 332 Mineral-Insulated, Metal-Sheathed Cable: Type MI 334 Nonmetallic-Sheathed Cable: Types NM, NMC, and NMS 336 Power and Control Tray Cable: Type TC 338 Service-Entrance Cable: Types SE and USE 340 Underground Feeder and Branch-Circuit Cable: Type UF 342 Intermediate Metal Conduit: Type IMC 344 Rigid Metal Conduit: Type RMC 348 Flexible Metal Conduit: Type FMC 350 Liquidtight Flexible Metal Conduit: Type LFMC 352 Rigid Polyvinyl Chloride Conduit: Type PVC 353 High Density Polyethylene Conduit: Type HDPE Conduit 354 Nonmetallic Underground Conduit with Conductors: Type NUCC 355 Reinforced Thermosetting Resin Conduit: Type RTRC 356 Liquidtight Flexible Nonmetallic Conduit: Type LFNC 358 Electrical Metallic Tubing: Type EMT 360 Flexible Metallic Tubing: Type FMT 362 Electrical Nonmetallic Tubing: Type ENT 366 Auxiliary Gutters 368 Busways 370 Cablebus 372 Cellular Concrete Floor Raceways 374 Cellular Metal Floor Raceways 376 Metal Wireways 378 Nonmetallic Wireways 380 Multioutlet Assembly 382 Nonmetallic Extensions 384 Strut-Type Channel Raceway 386 Surface Metal Raceways 388 Surface Nonmetallic Raceways 390 Underfloor Raceways 392 Cable Trays 393 Low-Voltage Suspended Ceiling Power Distribution Systems 394 Concealed Knob-and-Tube Wiring 396 Messenger-Supported Wiring 398 Open Wiring on Insulators 399 Outdoor Overhead Conductors over 1000 Volts
Chapter 4 Equipment for General Use 400 Flexible Cords and Flexible Cables 402 Fixture Wires 404 Switches 406 Receptacles, Cord Connectors, and Attachment Plugs (Caps) 408 Switchboards, Switchgear, and Panelboards 409 Industrial Control Panels 410 Luminaires, Lampholders, and Lamps 411 Low-Voltage Lighting 422 Appliances 424 Fixed Electric Space-Heating Equipment 425 Fixed Resistance and Electrode Industrial Process Heating Equipment 426 Fixed Outdoor Electric Deicing and Snow-Melting Equipment 427 Fixed Electric Heating Equipment for Pipelines and Vessels 430 Motors, Motor Circuits, and Controllers 440 Air-Conditioning and Refrigerating Equipment 445 Generators 450 Transformers and Transformer Vaults (Including Secondary Ties) 455 Phase Converters 460 Capacitors 470 Resistors and Reactors 480 Storage Batteries 490 Equipment Over 1000 Volts, Nominal
Chapter 5 Special Occupancies 500 Hazardous (Classified) Locations, Classes I, II, and III, Divisions 1 and 2 501 Class I Locations 502 Class II Locations 503 Class III Locations 504 Intrinsically Safe Systems 505 Zone 0, 1, and 2 Locations 506 Zone 20, 21, and 22 Locations for Combustible Dusts or Ignitible Fibers/Flyings 510 Hazardous (Classified) Locations - Specific 511 Commercial Garages, Repair and Storage 513 Aircraft Hangars 514 Motor Fuel Dispensing Facilities 515 Bulk Storage Plants 516 Spray Application, Dipping, Coating, and Printing Processes Using Flammable or Combustible Materials 517 Health Care Facilities 518 Assembly Occupancies 520 Theaters, Audience Areas of Motion Picture and Television Studios, Performance Areas, and Similar Locations 522 Control Systems for Permanent Amusement Attractions 525 Carnivals, Circuses, Fairs, and Similar Events 530 Motion Picture and Television Studios and Similar Locations 540 Motion Picture Projection Rooms 545 Manufactured Buildings 547 Agricultural Buildings 550 Mobile Homes, Manufactured Homes, and Mobile Home Parks 551 Recreational Vehicles and Recreational Vehicle Parks 552 Park Trailers 553 Floating Buildings 555 Marinas, Boatyards, and Commercial and Noncommercial Docking Facilities 590 Temporary Installations
Chapter 6 Special Equipment 600 Electric Signs and Outline Lighting 604 Manufactured Wiring Systems 605 Office Furnishings 610 Cranes and Hoists 620 Elevators, Dumbwaiters, Escalators, Moving Walks, Platform Lifts, and Stairway Chairlifts 625 Electric Vehicle Charging System 626 Electrified Truck Parking Spaces 630 Electric Welders 640 Audio Signal Processing, Amplification, and Reproduction Equipment 645 Information Technology Equipment 646 Modular Data Centers 647 Sensitive Electronic Equipment 650 Pipe Organs 660 X-Ray Equipment 665 Induction and Dielectric Heating Equipment 668 Electrolytic Cells 669 Electroplating 670 Industrial Machinery 675 Electrically Driven or Controlled Irrigation Machines 680 Swimming Pools, Fountains, and Similar Installations 682 Natural and Artificially Made Bodies of Water 685 Integrated Electrical Systems 690 Solar Photovoltaic (PV) Systems 691 Large-Scale Photovoltaic (PV) Electric Power Production Facility 692 Fuel Cell Systems 694 Wind Electric Systems 695 Fire Pumps
Chapter 7 Special Conditions 700 Emergency Systems 701 Legally Required Standby Systems 702 Optional Standby Systems 705 Interconnected Electric Power Production Sources 706 Energy Storage Systems 708 Critical Operations Power Systems (COPS) 710 Stand-Alone Systems 712 Direct Current Microgrids 720 Circuits and Equipment Operating at Less Than 50 Volts 725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits 727 Instrumentation Tray Cable: Type ITC 728 Fire-Resistive Cable Systems 750 Energy Management Systems 760 Fire Alarm Systems 770 Optical Fiber Cables
Chapter 8 Communications Systems 800 Communications Circuits 810 Radio and Television Equipment 820 Community Antenna Television and Radio Distribution Systems 830 Network-Powered Broadband Communications Systems 840 Premises-Powered Broadband Communications Systems
Chapter 9 Tables Informative Annex A Product Safety Standards Informative Annex B Application Information for Ampacity Calculation Informative Annex C Conduit and Tubing Fill Tables for Conductors and Fixture Wires of the Same Size Informative Annex D Examples Informative Annex E Types of Construction 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 Informative Annex G Supervisory Control and Data Acquisition (SCADA) Informative Annex H Administration and Enforcement Informative Annex I Recommended Tightening Torque Tables from UL Standard 486A-B Informative Annex J ADA Standards for Accessible Design Index
NFPA 70®: National Electrical Code® (NEC®) is the basis for electrical safety that has saved countless lives.
Adopted in all 50 states, the NEC helps protect people and property from electrical hazards involving wiring and equipment. Comprehensive provisions address electrical installations in virtually all buildings -- including commercial, residential, and industrial occupancies. Revisions to the NEC are industry-driven, based on public proposals and comments. Each editio n of the Code builds on the next, through consensus-based changes that reflect the evolving needs of the field, emerging technologies, and new information about electrical safety.
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Boost your referencing power with NFPA®'s best-selling NEC® Tabs for your NEC Code or NEC Handbook.
Invest in this easy way to save time on every electrical job. Self-adhesive NEC Tabs affix to the edition your copy of NFPA 70®: National Electrical Code® or NEC Handbook, so you can flip open your book to the latest electrical safety information.
NEC Tabs highlight electrical topics by Code article and name including:
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NFPA®'s Redline PDF contains both the current NFPA document and a Redline version of the document which shows changes from the previous edition marked in color. With the Redline you can quickly spot changed sections and tell specifically what has been changed from the previous edition, saving time and confusion.
Sample (NEC® 2014)
411.2411.3 Definition. Low-Voltage Lighting Systems.
(A) General. Lighting Ssystems Ooperating at 30 Volts- volts or Less. A lighting system consisting less shall consist of an isolating power supply, the low-voltage luminaires, and associated equipment that are all identified for the use. The output circuits of the power supply are shall be rated for not more than 25 amperes and operate at 30 volts (42.4 volts peak) or lessmaximum under all load conditions.
(B) Class 2. Listed Class 2 lighting equipment shall be rated in conformance with Chapter 9, Table 11(A) or Table 11(B).
411.3411.4 Listing Required. Lighting systems operating at 30 volts or less shall comply with 411.3(A)411.4(A) or
411.3(B).411.4(B). Class 2 power sources and lighting equipment connected to Class 2 power sources shall be llisted.
All-new NEC® Reference Cards provide fast and easy access to the most essential NEC tables for electrical contractors and installers.
Keep installations right on the money with 13 frequently referenced NEC tables printed on durable waterproof NEC Reference Cards. Based on the 2017 edition of NFPA 70®: National Electrical Code®, double-sided Reference Cards are lightweight and compact enough to fit into a pocket. They also easily attach to your belt or toolbox using the 1" ring-clip (included). Carry all the cards or just those you need on a particular job.
Save time and improve accuracy with handy access to the NEC tables that contractors and installers reference most often in the field:
Includes 13 cards, 3.5" x 5.5" each, 2017