NFPA 70: National Electrical Code (NEC)

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2014 NFPA 70




2014 NFPA 70 Handbook

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Many new and revised requirements in the 2014 NEC® impact residential, commercial, and industrial electrical installations.

The 2014 NFPA 70®: NEC® covers the latest requirements on electrical wiring and equipment installation issues, including minimum provisions for the use of connections, voltage markings, conductors, and cables. Chapters address specific circumstances surrounding special occupancies and industrial equipment and machines. It also contains specific details on the safe installation and use of communications and signaling conductors.

All requirements in the National Electrical Code® are confirmed through a rigorous process of comprehensive review, markup, annotation and revision. The NEC has been published since 1897, and in that time the code and its accompanying National Electrical Code Handbook have undergone radical restructuring to reflect the latest electrical and wiring technologies.

The 2014 edition of the NEC has been revised to include important changes such as:

  • Expanded AFCI and GFCI protection in homes
  • Continued emphasis on making installations safe for electrical workers
  • Coverage of new methods to distribute low voltage power
  • New approaches toward ensuring safety of photovoltaic (PV) electric systems
  • Changes to the long-standing voltage thresholds used in the Code
  • Plus hundreds of others that allow for the safe implementation of the latest in electrical system and equipment technology.

Stay ahead with the 2014 NEC's safety updates and time-tested, trusted guidance.

Electrical hazards result in many thousands of accidents in residences and commercial spaces each year. NFPA 70: National Electrical Code is the nation's singular code for safe electrical installation. Over its 100+ years of publication, the NEC has become the most trusted electrical standard throughout much of the world, lending considerable weight to its authoritative collection of code requirements. As time moves forward, so does the NEC.The 2014 edition added four all-new Articles on growing technologies such as:

  • Low Voltage Direct Current Distribution Systems (Article 393)
  • Modular Data Centers (Article 646)
  • Fire Resistive Cable Systems (Article 728)
  • Energy Management Systems (Article 750)

The NEC 70 provides the most comprehensive set of rules for all types of electrical wiring and equipment.

The Code's charter is broad, covering electrical conductors, equipment, and raceways for a wide array of spaces and premises. This includes all public and private buildings, homes, and structures; outdoor yards and lots; installations that connect to the power grid; and utility equipment. Major changes in the NEC also respond to electrical safety concerns with respect to NFPA 70E®: Standard for Electrical Safety in the Workplace®, such as new centralized locking requirements, field marking of equipment, and hazard warning labels.

Get up-to-code with the new 2014 National Electrical Code from NFPA!

NFPA 70 is the foundation of all electrical wiring and practice in the United States, and going without the latest edition creates a needless risk. Protect lives and property from electrical dangers and buy the 2014 National Electrical Code today. (Softbound, 910 pp., 2014)

NFPA 70® National Electrical Code® 2014 Edition

90 Introduction
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 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 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 Lighting Systems Operating at 30 Volts or Less and Lighting Equipment Connected to Class-2 Power Sources
422 Appliances
424 Fixed Electric Space-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 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 and Boatyards
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
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
708 Critical Operations Power Systems (COPS)
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 and Raceways
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 BApplication 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

Editor-in-Chief: Mark W. Earley

Editors: Christopher D. Coache, Mark Cloutier, and Gil Moniz

The 2014 National Electrical Code® Handbook from NFPA® explains today's NEC® in full. There's nothing else like it!

A one-stop source of National Electrical Code information, the 2014 NEC Handbook from NFPA does much more than bring you up-to-code -- it also explains the reasoning behind NFPA 70®: NEC concepts, provides real-world examples, and gives you the background behind Code revisions, so you can work with authority.

Trust the only NEC Code reference that has it all:

  • Complete 2014 NEC text for convenient reference
  • Explanations from experts involved with NEC development
  • First-time commentary on four new articles that expand NEC coverage to address industry needs
  • Commentary on important changes involving AFCIs and GFCIs, electrical worker safety, and green energy systems
  • Full-color photos and visuals such as schematics, floor plans, flow charts, and cross-sectional graphics
  • Extracted data from other NFPA documents and UL White Book

Written by experts who are at the center of the NEC development process.

The 2014 NEC Handbook is loaded with essential information about Code application, from the experts who know the NEC best. Revised NEC text is highlighted in yellow to make Code changes stand out. Commentary and examples are printed in blue. Vertical rules alert you to new articles, figures, and tables; and bullets signal deletions.

Insightful, comprehensive, and dependable, no other source compares with the 2014 NEC Handbook!

Work with the authority trusted by electrical contractors, engineers, electricians, safety officials, inspectors, and architects nationwide. Order your 2014 NEC Handbook today from NFPA. (Hardbound, 1270 pp., 2014)

NFPA 70® National Electrical Code® Handbook 2014 Edition

Preface

Acknowledgments

About the Editors

90 Introduction
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 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 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 Lighting Systems Operating at 30 Volts or Less and Lighting Equipment Connected to Class-2 Power Sources
422 Appliances
424 Fixed Electric Space-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 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 and Boatyards
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
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
708 Critical Operations Power Systems (COPS)
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 and Raceways
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 BApplication 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
<strong>Important information about NFPA codes and standards available</strong>

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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.

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Sample (NFPA 10, 2010)

5.3.2.7* Wheeled fire extinguishers shall be considered for hazard protection where fulfillment of the following requirementsis necessary: in areas in which a fire risk assessment has shown the following:

(4) (1) High hazard areas are present.

(5) (2) Limited available personnel Limited available personnel are present, thereby requiring an extinguisher that has the following features:

(1) (a) High agent flow rates

(2) (b) Increased agent stream range

(3) (c) Increased agent capacity