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 Load Calculations 225 Outside Branch Circuits and Feeders 230 Services 240 Overcurrent Protection 242 Overvoltage Protection 250 Grounding and Bonding Chapter 3 Wiring Methods and Materials 300 General Requirements for Wiring Methods and Materials 310 Conductors for General Wiring 311 Medium Voltage Conductors and Cable 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 330 Metal-Clad Cable: Type MC 332 Mineral-Insulated, Metal-Sheathed Cable: Type MI 334 Nonmetallic-Sheathed Cable: Types NM and NMC 336 Power and Control Tray Cable: Type TC337 Type P Cable 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 Trays393 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 1000Volts 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 1000Volts, Nominal Chapter 5 Special Occupancies 500 Hazardous (Classified) Locations, ClassesI, II, andIII, Divisions1 and2 501 ClassI Locations 502 ClassII Locations 503 ClassIII Locations 504 Intrinsically Safe Systems 505 Zone 0, 1, and 2Locations 506 Zone 20, 21, and 22Locations 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 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 Lighting604 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 Supply Stations 692 Fuel Cell Systems 694 Wind Electric Systems 695 Fire Pumps Chapter 7 Special Conditions 700 Emergency Systems 701 Legally Required Standby Systems702 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 50Volts 725 Class1, Class2, and Class3 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 General Requirements for Communications Systems 805 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, 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-B Informative Annex J: ADA Standards for Accessible Design Index