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NFPA 70: National Electrical Code (NEC), 2023
- Important Notices and Disclaimers
- Additional Important Notices and Disclaimers
- 90 Introduction
- Chapter 1 General [Go to Page]
- 100 Definitions
- 110 General Requirements for Electrical Installations
- Chapter 2 Wiring and Protection [Go to Page]
- 200 Use and Identification of Grounded Conductors
- 210 Branch Circuits Not Over 1000 Volts ac, 1500 Volts dc, Nominal
- 215 Feeders
- 220 Branch-Circuit, Feeder, and Service Load Calculations
- 225 Outside Branch Circuits and Feeders
- 230 Services
- 235 Branch Circuits, Feeders, and Services Over 1000 Volts ac, 1500 Volts dc, Nominal
- 240 Overcurrent Protection
- 242 Overvoltage Protection
- 245 Overcurrent Protection for Systems Rated Over 1000 Volts ac, 1500 Volts dc
- 250 Grounding and Bonding
- Chapter 3 Wiring Methods and Materials [Go to Page]
- 300 General Requirements for Wiring Methods and Materials
- 305 General Requirements for Wiring Methods and Materials for Systems Rated Over 1000 Volts ac, 1500 Volts dc, Nominal
- 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
- 315 Medium Voltage Conductors, Cable, Cable Joints, and Cable Terminations
- 320 Armored Cable: Type AC
- 322 Flat Cable Assemblies: Type FC
- 324 Flat Conductor Cable: Type FCC
- 326 Integrated Gas Spacer Cable: Type IGS
- 330 Metal-Clad Cable: Type MC
- 332 Mineral-Insulated, Metal-Sheathed Cable: Type MI
- 334 Nonmetallic-Sheathed Cable: Types NM and NMC
- 335 Instrumentation Tray Cable: Type ITC
- 336 Power and Control Tray Cable: Type TC
- 337 Type P Cable
- 338 Service-Entrance Cable: Types SE and USE
- 340 Underground Feeder and Branch-Circuit Cable: Type UF
- 342 Intermediate Metal Conduit (IMC)
- 344 Rigid Metal Conduit (RMC)
- 348 Flexible Metal Conduit (FMC)
- 350 Liquidtight Flexible Metal Conduit (LFMC)
- 352 Rigid Polyvinyl Chloride Conduit (PVC)
- 353 High Density Polyethylene Conduit (HDPE Conduit)
- 354 Nonmetallic Underground Conduit with Conductors (NUCC)
- 355 Reinforced Thermosetting Resin Conduit (RTRC)
- 356 Liquidtight Flexible Nonmetallic Conduit (LFNC)
- 358 Electrical Metallic Tubing (EMT)
- 360 Flexible Metallic Tubing (FMT)
- 362 Electrical Nonmetallic Tubing (ENT)
- 366 Auxiliary Gutters
- 368 Busways
- 369 Insulated Bus Pipe (IBP)/Tubular Covered Conductors (TCC) Systems
- 370 Cablebus
- 371 Flexible Bus Systems
- 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
- 395 Outdoor Overhead Conductors over 1000 Volts
- 396 Messenger-Supported Wiring
- 398 Open Wiring on Insulators
- Chapter 4 Equipment for General Use [Go to Page]
- 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 Stationary Standby Batteries
- 495 Equipment Over 1000 Volts ac, 1500 Volts dc, Nominal
- Chapter 5 Special Occupancies [Go to Page]
- 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
- 511 Commercial Garages, Repair and Storage
- 512 Cannabis Oil Equipment and Cannabis Oil Systems Using Flammable Materials
- 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 Remote Locations
- 540 Motion Picture Projection Rooms
- 545 Manufactured Buildings and Relocatable Structures
- 547 Agricultural Buildings
- 550 Mobile Homes, Manufactured Homes, and Mobile Home Parks
- 551 Recreational Vehicles and Recreational Vehicle Parks
- 552 Park Trailers
- 555 Marinas, Boatyards, Floating Buildings, and Commercial and Noncommercial Docking Facilities
- 590 Temporary Installations
- Chapter 6 Special Equipment [Go to Page]
- 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 Power Transfer 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 Supply Stations
- 692 Fuel Cell Systems
- 694 Wind Electric Systems
- 695 Fire Pumps
- Chapter 7 Special Conditions [Go to Page]
- 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
- 722 Cables for Power-Limited Circuits and Fault-Managed Power Circuits
- 724 Class 1 Power-Limited Circuits and Class 1 Power-Limited Remote-Control and Signaling Circuits
- 725 Class 2 and Class 3 Power-Limited Circuits
- 726 Class 4 Fault-Managed Power Systems
- 728 Fire-Resistive Cable Systems
- 750 Energy Management Systems
- 760 Fire Alarm Systems
- 770 Optical Fiber Cables
- Chapter 8 Communications Systems [Go to Page]
- 800 General Requirements for Communications Systems
- 805 Communications Circuits
- 810 Antenna Systems.
- 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, Tubing, and Cable Tray 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-486B
- Informative Annex J ADA Standards for Accessible Design
- Informative Annex K Use of Medical Electrical Equipment in Dwellings and Residential Board-and-Care Occupancies [Go to Page]
