NFPA 70:2023

Chapter 1 General 100 Definitions 110 General Requirements for Electrical Installations Chapter 2 Wiring and Protection 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 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 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 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 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 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 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