1. Home
  2. Flashcards
  3. Preview

2017 NEC articles June 2024

  1. Chapter 1
    Chapter 1 — General

    • Article 100 Article 100 Definitions
    • Article 110 Article 110 Requirements for Electrical Installations
  2. Introduction
    • Article 90 - Introduction
  3. Chapter 2
    • Chapter 2 — Wiring and Protection

    • Article 200 Article 200 Use and Identification of Grounded Conductors
    • Article 210 Article 210 Branch Circuits
    • Article 215 Article 215 Feeders
    • Article 220 Article 220 Branch-Circuit, Feeder, and Service Load Calculations
    • Article 225 Article 225 Outside Branch Circuits and Feeders
    • Article 230 Article 230 Services
    • Article 240 Article 240 Overcurrent Protection
    • Article 250 Article 250 Grounding and Bonding
    • Article 280 Article 280 Surge Arresters, Over 1000 Volts
    • Article 285 Article 285 Surge-Protective Devices (SPDs), 1000 Volts or Less
  4. Chapter 3
    • Chapter 3 — Wiring Methods and Materials

    • Article 300 Article 300 General Requirements for Wiring Methods and Materials
    • Article 310 Article 310 Conductors for General Wiring
    • Article 312 Article 312 Cabinets, Cutout Boxes, and Meter Socket Enclosures
    • Article 314 Article 314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures
    • Article 320 Article 320 Armored Cable: Type AC
    • Article 322 Article 322 Flat Cable Assemblies: Type FC
    • Article 324 Article 324 Flat Conductor Cable: Type FCC
    • Article 326 Article 326 Integrated Gas Spacer Cable: Type IGS
    • Article 328 Article 328 Medium Voltage Cable: Type MV
    • Article 330 Article 330 Metal-Clad Cable: Type MC
    • Article 332 Article 332 Mineral-Insulated, Metal-Sheathed Cable: Type MI
    • Article 334 Article 334 Nonmetallic-Sheathed Cable: Types NM, NMC, and NMS
    • Article 336 Article 336 Power and Control Tray Cable: Type TC
    • Article 338 Article 338 Service-Entrance Cable: Types SE and USE
    • Article 340 Article 340 Underground Feeder and Branch-Circuit Cable: Type UF
    • Article 342 Article 342 Intermediate Metal Conduit: Type IMC
    • Article 344 Article 344 Rigid Metal Conduit: Type RMC
    • Article 348 Article 348 Flexible Metal Conduit: Type FMC
    • Article 350 Article 350 Liquidtight Flexible Metal Conduit: Type LFMC
    • Article 352 Article 352 Rigid Polyvinyl Chloride Conduit: Type PVC
    • Article 353 Article 353 High Density Polyethylene Conduit: Type HDPE Conduit
    • Article 354 Article 354 Nonmetallic Underground Conduit with Conductors: Type NUCC
    • Article 355 Article 355 Reinforced Thermosetting Resin Conduit: Type RTRC
    • Article 356 Article 356 Liquidtight Flexible Nonmetallic Conduit: Type LFNC
    • Article 358 Article 358 Electrical Metallic Tubing: Type EMT
    • Article 360 Article 360 Flexible Metallic Tubing: Type FMT
    • Article 362 Article 362 Electrical Nonmetallic Tubing: Type ENT
    • Article 366 Article 366 Auxiliary Gutters
    • Article 368 Article 368 Busways
    • Article 370 Article 370 Cablebus
    • Article 372 Article 372 Cellular Concrete Floor Raceways
    • Article 374 Article 374 Cellular Metal Floor Raceways
    • Article 376 Article 376 Metal Wireways
    • Article 378 Article 378 Nonmetallic Wireways
    • Article 380 Article 380 Multioutlet Assembly
    • Article 382 Article 382 Nonmetallic Extensions
    • Article 384 Article 384 Strut-Type Channel Raceway
    • Article 386 Article 386 Surface Metal Raceways
    • Article 388 Article 388 Surface Nonmetallic Raceways
    • Article 390 Article 390 Underfloor Raceways
    • Article 392 Article 392 Cable Trays
    • Article 393 Article 393 Low-Voltage Suspended Ceiling Power Distribution Systems
    • Article 394 Article 394 Concealed Knob-and-Tube Wiring
    • Article 396 Article 396 Messenger-Supported Wiring
    • Article 398 Article 398 Open Wiring on Insulators
    • Article 399 Article 399 Outdoor Overhead Conductors over 1000 Volts
  5. Chapter 4
    • Chapter 4 - Equipment for General Use

    • Article 400 Flexible Cords and Flexible Cables
    • Article 402 Fixture Wires
    • Article 404 Switches
    • Article 406 Receptacles, Cord Connectors, and Attachment Plugs (Caps)
    • Article 408 Switchboards, Switchgear, and Panelboards
    • Article 409 Industrial Control Panels
    • Article 410 Luminaires, Lampholders, and Lamps
    • Article 411 Low-Voltage Lighting
    • Article 422 Appliances
    • Article 424 Fixed Electric Space-Heating Equipment
    • Article 425 Fixed Resistance and Electrode Industrial Process Heating Equipment
    • Article 426 Fixed Outdoor Electric Deicing and Snow-Melting Equipment
    • Article 427 Fixed Electric Heating Equipment for Pipelines and Vessels
    • Article 430 Motors, Motor Circuits, and Controllers
    • Article 440 Air-Conditioning and Refrigerating Equipment
    • Article 445 Generators
    • Article 450 Transformers and Transformer Vaults (Including Secondary Ties)
    • Article 455 Phase Converters
    • Article 460 Capacitors
    • Article 470 Resistors and Reactors
    • Article 480 Storage Batteries
    • Article 490 Equipment Over 1000 Volts, Nominal
  6. Chapter 5
    • Chapter 5 - Special Occupancies
    • Article 500 Hazardous (Classified) Locations, Classes I, II, and III, Divisions 1 and 2
    • Article 501 Class I Locations
    • Article 502 Class II Locations
    • Article 503 Class III Locations
    • Article 504 Intrinsically Safe Systems
    • Article 505 Zone 0, 1, and 2 Locations
    • Article 506 Zone 20, 21, and 22 Locations for Combustible Dusts or Ignitible Fibers/Flyings
    • Article 510 Hazardous (Classified) Locations — Specific
    • Article 511 Commercial Garages, Repair and Storage
    • Article 513 Aircraft Hangars
    • Article 514 Motor Fuel Dispensing Facilities
    • Article 515 Bulk Storage Plants
    • Article 516 Spray Application, Dipping, Coating, and Printing Processes Using Flammable or Combustible Materials
    • Article 517 Health Care Facilities
    • Article 518 Assembly Occupancies
    • Article 520 Theaters, Audience Areas of Motion Picture and Television Studios, Performance Areas, and Similar Locations
    • Article 522 Control Systems for Permanent Amusement Attractions
    • Article 525 Carnivals, Circuses, Fairs, and Similar Events
    • Article 530 Motion Picture and Television Studios and Similar Locations
    • Article 540 Motion Picture Projection Rooms
    • Article 545 Manufactured Buildings
    • Article 547 Agricultural Buildings
    • Article 550 Mobile Homes, Manufactured Homes, and Mobile Home Parks
    • Article 551 Recreational Vehicles and Recreational Vehicle Parks
    • Article 552 Park Trailers
    • Article 553 Floating Buildings
    • Article 555 Marinas, Boatyards, and Commercial and Noncommercial Docking Facilities
    • Article 590 Temporary Installations
  7. Chapter 6
    • Chapter 6 - Special Equipment
    • Article 600 Electric Signs and Outline Lighting
    • Article 604 Manufactured Wiring Systems
    • Article 605 Office Furnishings
    • Article 610 Cranes and Hoists
    • Article 620 Elevators, Dumbwaiters, Escalators, Moving Walks, Platform Lifts, and Stairway Chairlifts
    • Article 625 Electric Vehicle Charging System
    • Article 626 Electrified Truck Parking Spaces
    • Article 630 Electric Welders
    • Article 640 Audio Signal Processing, Amplification, and Reproduction Equipment
    • Article 645 Information Technology Equipment
    • Article 646 Modular Data Centers
    • Article 647 Sensitive Electronic Equipment
    • Article 650 Pipe Organs
    • Article 660 X-Ray Equipment
    • Article 665 Induction and Dielectric Heating Equipment
    • Article 668 Electrolytic Cells
    • Article 669 Electroplating
    • Article 670 Industrial Machinery
    • Article 675 Electrically Driven or Controlled Irrigation Machines
    • Article 680 Swimming Pools, Fountains, and Similar Installations
    • Article 682 Natural and Artificially Made Bodies of Water
    • Article 685 Integrated Electrical Systems
    • Article 690 Solar Photovoltaic (PV) Systems
    • Article 691 Large-Scale Photovoltaic (PV) Electric Power Production Facility
    • Article 692 Fuel Cell Systems
    • Article 694 Wind Electric Systems
    • Article 695 Fire Pumps
  8. Chapter 7
    • Chapter 7 - Special Conditions

    • Article 700 Emergency Systems
    • Article 701 Legally Required Standby Systems
    • Article 702 Optional Standby Systems
    • Article 705 Interconnected Electric Power Production Sources
    • Article 706 Energy Storage Systems
    • Article 708 Critical Operations Power Systems (COPS)
    • Article 710 Stand-Alone Systems
    • Article 712 Direct Current Microgrids
    • Article 720 Circuits and Equipment Operating at Less Than 50 Volts
    • Article 725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits
    • Article 727 Instrumentation Tray Cable: Type ITC
    • Article 728 Fire-Resistive Cable Systems
    • Article 750 Energy Management Systems
    • Article 760 Fire Alarm Systems
    • Article 770 Optical Fiber Cables
  9. Chapter 8
    • Chapter 8 - Communications Systems

    • Article 800 Communications Circuits
    • Article 810 Radio and Television Equipment
    • Article 820 Community Antenna Television and Radio Distribution Systems
    • Article 830 Network-Powered Broadband Communications Systems
    • Article 840 Premises-Powered Broadband Communications Systems
  10. Chapter 9
    Chapter 9 - Tables

    • Article 362 — Electrical Nonmetallic Tubing (ENT)
    • Article 348 — Flexible Metal Conduit (FMC)
    • Article 342 — Intermediate Metal Conduit (IMC)
    • Article 356 — Liquidtight Flexible Nonmetallic Conduit (LFNC-A*)
    • Article 356 — Liquidtight Flexible Nonmetallic Conduit (LFNC-B*)
    • Article 356 — Liquidtight Flexible Nonmetallic Conduit (LFNC-C*)
    • Article 350 — Liquidtight Flexible Metal Conduit (LFMC)
    • Article 344 — Rigid Metal Conduit (RMC)
    • Article 352 — Rigid PVC Conduit (PVC), Schedule 80
    • Articles 352 and 353 — Rigid PVC Conduit (PVC), Schedule 40, and HDPE Conduit (HDPE)
    • Article 352 — Type A, Rigid PVC Conduit (PVC)
    • Article 352 — Type EB, Rigid PVC Conduit (PVC)
    • Dimensions of Insulated Conductors and Fixture Wires
    • Compact Copper and Aluminum Building Wire Nominal Dimensions* and Areas
    • Conductor Properties
    • Alternating-Current Resistance and Reactance for 600-Volt Cables, 3-Phase, 60 Hz, 75°C (167°F) — Three Single Conductors in Conduit
    • Conductor Stranding
    • Class 2 and Class 3 Alternating-Current Power Source Limitations
    • PLFA Alternating-Current Power Source Limitations
  11. Article 100
    Article 100 Definitions

    Part I. General

    • Accessible (as applied to equipment).
    • Accessible (as applied to wiring methods).
    • Accessible, Readily (Readily Accessible).
    • Adjustable Speed Drive.
    • Adjustable Speed Drive System.
    • Ampacity.
    • Appliance.
    • Approved.
    • Arc-Fault Circuit Interrupter (AFCI).
    • Askarel.
    • Associated Apparatus [as applied to Hazardous (Classified) Locations].
    • Associated Nonincendive Field Wiring Apparatus [as applied to Hazardous (Classified) Locations].
    • Attachment Plug (Plug Cap) (Plug).
    • Authority Having Jurisdiction (AHJ).
    • Automatic.
    • Bathroom.
    • Battery System.
    • Bonded (Bonding).
    • Bonding Conductor or Jumper.
    • Bonding Jumper, Equipment.
    • Bonding Jumper, Main.
    • Bonding Jumper, System.
    • Branch Circuit.
    • Branch Circuit, Appliance.
    • Branch Circuit, General-Purpose.
    • Branch Circuit, Individual.
    • Branch Circuit, Multiwire.
    • Building.
    • Cabinet.
    • Cable Routing Assembly.
    • Charge Controller.
    • Circuit Breaker.
    • Clothes Closet.
    • Coaxial Cable.
    • Combustible Dust [as applied to Hazardous (Classified) Locations].
    • Combustible Gas Detection System [as applied to Hazardous (Classified) Locations].
    • Communications Equipment.
    • Communications Raceway.
    • Composite Optical Fiber Cable.
    • Concealed.
    • Conductive Optical Fiber Cable.
    • Conductor, Bare.
    • Conductor, Covered.
    • Conductor, Insulated.
    • Conduit Body.
    • Connector, Pressure (Solderless).
    • Continuous Load.
    • Control Circuit.
    • Control Drawing [as applied to Hazardous (Classified) Locations].
    • Controller.
    • Cooking Unit, Counter-Mounted.
    • Coordination, Selective (Selective Coordination).
    • Copper-Clad Aluminum Conductors.
    • Cord Connector [as applied to Hazardous (Classified) Locations].
    • Cutout Box.
    • Dead Front.
    • Demand Factor.
    • Device.
    • Disconnecting Means.
    • Dust-Ignitionproof [as applied to Hazardous (Classified) Locations].
    • Dusttight.
    • Duty, Continuous.
    • Duty, Intermittent.
    • Duty, Periodic.
    • Duty, Short-Time.
    • Duty, Varying.
    • Dwelling, One-Family.
    • Dwelling, Two-Family.
    • Dwelling, Multifamily.
    • Dwelling Unit.
    • Effective Ground-Fault Current Path.
    • Electric Power Production and Distribution Network.
    • Electric Sign.
    • Electric-Discharge Lighting.
    • Electrical Circuit Protective System
    • Electronically Actuated Fuse.
    • Enclosed.
    • Enclosure.
    • Energized.
    • Equipment.
    • Explosionproof Equipment.
    • Exposed (as applied to live parts).
    • Exposed (as applied to wiring methods).
    • Externally Operable.
    • Feeder.
    • Festoon Lighting.
    • Field Evaluation Body (FEB).
    • Field Labeled (as applied to evaluated products).
    • Fitting.
    • Garage.
    • Ground.
    • Ground Fault.
    • Grounded (Grounding).
    • Grounded, Solidly.
    • Grounded Conductor.
    • Ground-Fault Circuit Interrupter (GFCI).
    • Ground-Fault Current Path.
    • Ground-Fault Protection of Equipment.
    • Grounding Conductor, Equipment (EGC).
    • Grounding Electrode.
    • Grounding Electrode Conductor.
    • Guarded.
    • Guest Room.
    • Guest Suite.
    • Handhole Enclosure.
    • Hermetic Refrigerant Motor-Compressor.
    • Hermetically Sealed [as applied to Hazardous (Classified) Locations].
    • Hoistway.
    • Hybrid System.
    • Identified (as applied to equipment).
    • In Sight From (Within Sight From, Within Sight).
    • Industrial Control Panel.
    • Information Technology Equipment (ITE).
    • Innerduct.
    • Utility-Interactive Inverter.
    • Interactive System.
    • Interrupting Rating.
    • Intersystem Bonding Termination.
    • Intrinsically Safe Apparatus.
    • Intrinsically Safe System [as applied to Hazardous (Classified) Locations].
    • Isolated (as applied to location).
    • Kitchen.
    • Labeled.
    • Lighting Outlet.
    • Lighting Track (Track Lighting).
    • Listed.
    • Live Parts.
    • Location, Damp.
    • Location, Dry.
    • Location, Wet.
    • Luminaire.
    • Mobile Equipment.
    • Motor Control Center.
    • Multioutlet Assembly.
    • Neutral Conductor.
    • Neutral Point.
    • Nonautomatic.
    • Nonconductive Optical Fiber Cable.
    • Nonincendive Circuit [as applied to Hazardous (Classified) Locations].
    • Nonincendive Component [as applied to Hazardous (Classified) Locations].
    • Nonincendive Equipment [as applied to Hazardous (Classified) Locations].
    • Nonincendive Field Wiring [as applied to Hazardous (Classified) Locations].
    • Nonincendive Field Wiring Apparatus [as applied to Hazardous (Classified) Locations].
    • Nonlinear Load.
    • Oil Immersion [as applied to Hazardous (Classified) Locations].
    • Optical Fiber Cable.
    • Outlet.
    • Outline Lighting.
    • Overcurrent.
    • Overcurrent Protective Device, Branch-Circuit.
    • Overcurrent Protective Device, Supplementary.
    • Overload.
    • Panelboard.
    • Photovoltaic (PV) System.
    • Plenum.
    • Portable Equipment.
    • Power Outlet.
    • Premises Wiring (System).
    • Pressurized [as applied to Hazardous (Classified) Locations].
    • Process Seal [as applied to Hazardous (Classified) Locations].
    • Purged and Pressurized [as applied to Hazardous (Classified) Locations].
    • Qualified Person.
    • Raceway.
    • Rainproof.
    • Raintight.
    • Receptacle.
    • Receptacle Outlet.
    • Remote-Control Circuit.
    • Retrofit Kit.
    • Sealable Equipment.
    • Separately Derived System.
    • Service.
    • Service Cable.
    • Service Conductors.
    • Service Conductors, Overhead.
    • Service Conductors, Underground.
    • Service Drop.
    • Service-Entrance Conductors, Overhead System.
    • Service-Entrance Conductors, Underground System.
    • Service Equipment.
    • Service Lateral.
    • Service Point.
    • Short-Circuit Current Rating.
    • Show Window.
    • Signaling Circuit.
    • Simple Apparatus [as applied to Hazardous (Classified) Locations].
    • Special Permission.
    • Stand-Alone System.
    • Structure.
    • Surge Arrester.
    • Surge-Protective Device (SPD).
    • Switch, Bypass Isolation.
    • Switch, General-Use.
    • Switch, General-Use Snap.
    • Switch, Isolating.
    • Switch, Motor-Circuit.
    • Switch, Transfer.
    • Switchboard.
    • Switchgear.
    • Thermal Protector (as applied to motors).
    • Thermally Protected (as applied to motors).
    • Unclassified Locations [as applied to Hazardous (Classified) Locations].
    • Ungrounded.
    • Uninterruptible Power Supply.
    • Utilization Equipment.
    • Ventilated.
    • Volatile Flammable Liquid.
    • Voltage (of a circuit).
    • Voltage, Nominal.
    • Voltage to Ground.
    • Watertight.
    • Weatherproof.
    • Part II. Over 1000 Volts, Nominal

    • Electronically Actuated Fuse.
    • Fuse.
    • Multiple Fuse.
    • Substation.
    • Switching Device.
  12. Article 110
    Chapter 1 — General

    Article 110 - Requirements for Electrical Installations

    • Part I. General
    • 110.1 Scope.
    • This article covers general requirements for the examination and approval, installation and use, access to and spaces about electrical conductors and equipment; enclosures intended for personnel entry; and tunnel installations.
    • Informational Note: See Informative Annex J for information regarding ADA accessibility design.

    • 110.2 Approval.
    • 110.3 Examination, Identification, Installation, and Use, and Listing (Product Certification) of Equipment.
    • 110.4 Voltages.
    • 110.5 Conductors.
    • 110.6 Conductor Sizes.
    • 110.7 Wiring Integrity.
    • 110.8 Wiring Methods.
    • 110.9 Interrupting Rating.
    • 110.10 Circuit Impedance, Short-Circuit Current Ratings, and Other Characteristics.
    • 110.11 Deteriorating Agents.
    • 110.12 Mechanical Execution of Work.
    • 110.13 Mounting and Cooling of Equipment.
    • 110.14 Electrical Connections.
    • 110.15 High-Leg Marking.
    • 110.16 Arc-Flash Hazard Warning.
    • 110.18 Arcing Parts.
    • 110.19 Light and Power from Railway Conductors.
    • 110.21 Marking.
    • 110.22 Identification of Disconnecting Means.
    • 110.23 Current Transformers.
    • 110.24 Available Fault Current.
    • 110.25 Lockable Disconnecting Means.
    • Part II. 1000 Volts, Nominal, or Less

    • 110.26 Spaces About Electrical Equipment.
    • 110.27 Guarding of Live Parts.
    • 110.28 Enclosure Types.

    • Part III. Over 1000 Volts, Nominal
    • 110.30 General.
    • 110.31 Enclosure for Electrical Installations.
    • 110.32 Work Space About Equipment.
    • 110.33 Entrance to Enclosures and Access to Working Space.
    • 110.34 Work Space and Guarding.
    • 110.36 Circuit Conductors.
    • 110.40 Temperature Limitations at Terminations.
    • 110.41 Inspections and Tests.
    • Part IV. Tunnel Installations over 1000 Volts, Nominal

    • 110.51 General.
    • 110.52 Overcurrent Protection.
    • 110.53 Conductors.
    • 110.54 Bonding and Equipment Grounding Conductors.
    • 110.55 Transformers, Switches, and Electrical Equipment.
    • 110.56 Energized Parts.
    • 110.57 Ventilation System Controls.
    • 110.58 Disconnecting Means.
    • 110.59 Enclosures.
    • Part V. Manholes and Other Electrical Enclosures Intended for Personnel Entry

    • 110.70 General.
    • 110.71 Strength.
    • 110.72 Cabling Work Space.
    • 110.73 Equipment Work Space.
    • 110.74 Conductor Installation.
    • 110.75 Access to Manholes.
    • 110.76 Access to Vaults and Tunnels.
    • 110.77 Ventilation.
    • 110.78 Guarding.
    • 110.79 Fixed Ladders.
  13. Article 200
    Chapter 2 — Wiring and Protection

    Article 200 - Use and Identification of Grounded Conductors

    • 200.1 Scope.
    • This article provides requirements for the following:(1)Identification of terminals(2)Grounded conductors in premises wiring systems(3)Identification of grounded conductors
    • Informational Note: See Article 100 for definitions of Grounded Conductor, Equipment Grounding Conductor, and Grounding Electrode Conductor.
    • 200.2 General.
    • 200.3 Connection to Grounded System.
    • 200.4 Neutral Conductors.
    • 200.6 Means of Identifying Grounded Conductors.
    • 200.7 Use of Insulation of a White or Gray Color or with Three Continuous White or Gray Stripes.
    • 200.9 Means of Identification of Terminals.
    • 200.10 Identification of Terminals.
    • 200.11 Polarity of Connections.
  14. Article 210
    Chapter 2 — Wiring and Protection

    Article 210 - Branch Circuits

    Article 210 Branch Circuits

    • Part I. General Provisions
    • 210.1 Scope.
    • This article provides the general requirements for branch circuits.
    • 210.3 Other Articles for Specific-Purpose Branch Circuits.
    • 210.4 Multiwire Branch Circuits.
    • 210.5 Identification for Branch Circuits.
    • 210.6 Branch-Circuit Voltage Limitations.
    • 210.7 Multiple Branch Circuits.
    • 210.8 Ground-Fault Circuit-Interrupter Protection for Personnel.
    • 210.9 Circuits Derived from Autotransformers.
    • 210.10 Ungrounded Conductors Tapped from Grounded Systems.
    • 210.11 Branch Circuits Required.
    • 210.12 Arc-Fault Circuit-Interrupter Protection.
    • 210.13 Ground-Fault Protection of Equipment.
    • 210.17 Guest Rooms and Guest Suites.

    • Part II. Branch-Circuit Ratings
    • 210.18 Rating.
    • 210.19 Conductors — Minimum Ampacity and Size.
    • 210.20 Overcurrent Protection.
    • 210.21 Outlet Devices.
    • 210.22 Permissible Loads, Individual Branch Circuits.
    • 210.23 Permissible Loads, Multiple-Outlet Branch Circuits.
    • 210.24 Branch-Circuit Requirements — Summary.
    • 210.25 Branch Circuits in Buildings with More Than One Occupancy.

    • Part III. Required Outlets
    • 210.50 General.
    • 210.52 Dwelling Unit Receptacle Outlets.
    • 210.60 Guest Rooms, Guest Suites, Dormitories, and Similar Occupancies.
    • 210.62 Show Windows.
    • 210.63 Heating, Air-Conditioning, and Refrigeration Equipment Outlet.
    • 210.64 Electrical Service Areas.
    • 210.70 Lighting Outlets Required.
    • 210.71 Meeting Rooms.
  15. Article 215
    • Articles 215 - Feeders

    • 215.1 Scope.
    • This article covers the installation requirements, overcurrent protection requirements, minimum size, and ampacity of conductors for feeders.Exception: Feeders for electrolytic cells as covered in 668.3(C)(1) and (C)(4).
    • 215.2 Minmum Rating and Size
    • 215.3 Overcurrent Protection
    • 215.4 Feeders with Common Neutral Conductor
    • 215.5 Diagrams of Feeders
    • 215.6 Feeder Equipment Grounding Conductor
    • 215.7 Ungrounded Conductors Tapped from Grounded Systems
    • 215.9 Ground-Fault Circuit-Interrupter Protection for Personnel
    • 215.10 Ground-Fault Protection of Equipment
    • 215.11 Circuits Derived from Autotransformers
    • 215.12 Identification for Feeders
  16. Article 220
    Chapter 2 — Wiring and Protection

    Article 220 - Branch-Circuit, Feeder, and Service Load Calculations

    Part I. General

    • 220.1 Scope.
    • This article provides requirements for calculating branch-circuit, feeder, and service loads. Part I provides general requirements for calculation methods. Part II provides calculation methods for branch-circuit loads. Parts III and IV provide calculation methods for feeder and service loads. Part V provides calculation methods for farm loads.
    • Informational Note No. 1: See examples in Informative Annex D.Informational Note No. 2: See Figure 220.1 for information on the organization of Article 220.
    • 220.3 Application of Other Articles for Specific-Purpose Calculations.
    • 220.5 Calculations.

    • Part II. Branch-Circuit Load Calculations
    • 220.10 General.
    • 220.12 Lighting Load for Specified Occupancies.
    • 220.14 Other Loads — All Occupancies.
    • 220.16 Loads for Additions to Existing Installations.
    • 220.18 Maximum Loads.

    • Part III. Feeder and Service Load Calculations
    • 220.40 General.
    • 220.42 General Lighting.
    • 220.43 Show-Window and Track Lighting.
    • 220.44 Receptacle Loads — Other Than Dwelling Units.
    • 220.50 Motors.
    • 220.51 Fixed Electric Space Heating.
    • 220.52 Small-Appliance and Laundry Loads — Dwelling Unit.
    • 220.53 Appliance Load — Dwelling Unit(s).
    • 220.54 Electric Clothes Dryers — Dwelling Unit(s).
    • 220.55 Electric Cooking Appliances in Dwelling Units and Household Cooking Appliances Used in Instructional Programs.
    • 220.56 Kitchen Equipment — Other Than Dwelling Unit(s).
    • 220.60 Noncoincident Loads.
    • 220.61 Feeder or Service Neutral Load.

    • Part IV. Optional Feeder and Service Load Calculations
    • 220.80 General.
    • 220.82 Dwelling Unit.
    • 220.83 Existing Dwelling Unit.
    • 220.84 Multifamily Dwelling.
    • 220.85 Two Dwelling Units.
    • 220.86 Schools.
    • 220.87 Determining Existing Loads.
    • 220.88 New Restaurants.

    • Part V. Farm Load Calculations
    • 220.100 General.
    • 220.102 Farm Loads — Buildings and Other Loads.
    • 220.103 Farm Loads — Total.
  17. Article 225 
    Chapter 2 — Wiring and Protection

    Article 225 - Outside Branch Circuits and Feeders

    • 225.1 Scope.
    • This article covers requirements for outside branch circuits and feeders run on or between buildings, structures, or poles on the premises; and electrical equipment and wiring for the supply of utilization equipment that is located on or attached to the outside of buildings, structures, or poles.

    Informational Note: For additional information on wiring over 1000 volts, see ANSI/IEEE C2-2012, National Electrical Safety Code.

    Article 225 provides requirements unique to the installation of feeders and branch circuits outside (overhead and underground) of buildings and structures. These circuits may be supplying specific items of electrical equipment, or they may be the power supply to another building or structure. Examples of outside feeders and branch circuits include the following:

    • Conductors supplying the buildings of a multibuilding industrial complex or institutional campus
    • Outdoor supply conductors from an emergency system, standby system, an alternative energy system, or on-site power generation
    • Supply conductors between a dwelling unit and detached garage or other structure
    • These requirements are in addition to the general requirements for branch circuits and feeders in Articles 210 and 215.

    • 225.3 Other Articles.
    • Part I. General

    • 225.4 Conductor Covering.
    • 225.5 Size of Conductors 600 Volts, Nominal, or Less.
    • 225.6 Conductor Size and Support.
    • 225.7 Lighting Equipment Installed Outdoors.
    • 225.8 Calculation of Loads 1000 Volts, Nominal, or Less.
    • 225.10 Wiring on Buildings (or Other Structures).
    • 225.11 Feeder and Branch-Circuit Conductors Entering, Exiting, or Attached to Buildings or Structures.
    • 225.12 Open-Conductor Supports.
    • 225.14 Open-Conductor Spacings.
    • 225.15 Supports over Buildings.
    • 225.16 Attachment to Buildings.
    • 225.17 Masts as Supports.
    • 225.18 Clearance for Overhead Conductors and Cables.
    • 225.19 Clearances from Buildings for Conductors of Not over 1000 Volts, Nominal.
    • 225.20 Mechanical Protection of ConductorsProtection Against Physical Damage.
    • 225.21 Multiconductor Cables on Exterior Surfaces of Buildings (or Other Structures).
    • 225.22 Raceways on Exterior Surfaces of Buildings or Other Structures.
    • 225.24 Outdoor Lampholders.
    • 225.25 Location of Outdoor Lamps.
    • 225.26 Vegetation as Support.
    • 225.27 Raceway Seal.
    • Part II. Buildings or Other Structures Supplied by a Feeder(s) or Branch Circuit(s)

    • 225.30 Number of Supplies.
    • 225.31 Disconnecting Means.
    • 225.32 Location.
    • 225.33 Maximum Number of Disconnects.
    • 225.34 Grouping of Disconnects.
    • 225.35 Access to Occupants.
    • 225.36 Type of Disconnecting Means.
    • 225.37 Identification.
    • 225.38 Disconnect Construction.
    • 225.39 Rating of Disconnect.
    • 225.40 Access to Overcurrent Protective Devices.
    • Part III. Over 1000 Volts.

    • 225.50 Sizing of Conductors.
    • 225.51 Isolating Switches.
    • 225.52 Disconnecting Means.
    • 225.56 Inspections and Tests.
    • 225.60 Clearances over Roadways, Walkways, Rail, Water, and Open Land.
    • 225.61 Clearances over Buildings and Other Structures.
  18. Article 230
    • Article 230 - Services

    230.1 Scope.

    This article covers service conductors and equipment for control and protection of services and their installation requirements.


    • Part I. General
    • 230.2 Number of Services.
    • 230.3 One Building or Other Structure Not to Be Supplied Through Another.
    • 230.6 Conductors Considered Outside the Building.
    • 230.7 Other Conductors in Raceway or Cable.
    • 230.8 Raceway Seal.
    • 230.9 Clearances on Buildings.
    • 230.10 Vegetation as Support.

    • Part II. Overhead Service Conductors
    • 230.22 Insulation or Covering.
    • 230.23 Size and Rating.
    • 230.24 Clearances.
    • 230.26 Point of Attachment.
    • 230.27 Means of Attachment.
    • 230.28 Service Masts as Supports.
    • 230.29 Supports over Buildings.

    • Part III. Underground Service Conductors
    • 230.30 Installation.
    • 230.31 Size and Rating.
    • 230.32 Protection Against Damage.
    • 230.33 Spliced Conductors.

    • Part IV. Service-Entrance Conductors
    • 230.40 Number of Service-Entrance Conductor Sets.
    • 230.41 Insulation of Service-Entrance Conductors.
    • 230.42 Minimum Size and Rating.
    • 230.43 Wiring Methods for 1000 Volts, Nominal, or Less.
    • 230.44 Cable Trays.
    • 230.46 Spliced Conductors.
    • 230.50 Protection Against Physical Damage.
    • 230.51 Mounting Supports.
    • 230.52 Individual Conductors Entering Buildings or Other Structures.
    • 230.53 Raceways to Drain.
    • 230.54 Overhead Service Locations.
    • 230.56 Service Conductor with the Higher Voltage to Ground.

    • Part V. Service Equipment — General
    • 230.62 Service Equipment — Enclosed or Guarded.
    • 230.66 Marking.

    • Part VI. Service Equipment — Disconnecting Means
    • 230.70 General.
    • 230.71 Maximum Number of Disconnects.
    • 230.72 Grouping of Disconnects.
    • 230.74 Simultaneous Opening of Poles.
    • 230.75 Disconnection of Grounded Conductor.
    • 230.76 Manually or Power Operable.
    • 230.77 Indicating.
    • 230.79 Rating of Service Disconnecting Means.
    • 230.80 Combined Rating of Disconnects.
    • 230.81 Connection to Terminals.
    • 230.82 Equipment Connected to the Supply Side of Service Disconnect.

    • Part VII. Service Equipment — Overcurrent Protection
    • 230.90 Where Required.
    • 230.91 Location.
    • 230.92 Locked Service Overcurrent Devices.
    • 230.93 Protection of Specific Circuits.
    • 230.94 Relative Location of Overcurrent Device and Other Service Equipment.
    • 230.95 Ground-Fault Protection of Equipment.

    • Part VIII. Services Exceeding 1000 Volts, Nominal
    • 230.200 General.
    • 230.202 Service-Entrance Conductors.
    • 230.204 Isolating Switches.
    • 230.205 Disconnecting Means.
    • 230.206 Overcurrent Devices as Disconnecting Means.
    • 230.208 Protection Requirements.
    • 230.209 Surge Arresters (Lightning Arresters).
    • 230.210 Service Equipment — General Provisions.
    • 230.211 Switchgear.
    • 230.212 Over 35,000 Volts.
  19. Article 240
    • Article 240 - Overcurrent Protection

    • Part I. General
    • 240.1 Scope.
    • Parts I through VII of this article provide the general requirements for overcurrent protection and overcurrent protective devices not more than 1000 volts, nominal. Part VIII covers overcurrent protection for those portions of supervised industrial installations operating at voltages of not more than 1000 volts, nominal. Part IX covers overcurrent protection over 1000 volts, nominal.

    Informational Note: Overcurrent protection for conductors and equipment is provided to open the circuit if the current reaches a value that will cause an excessive or dangerous temperature in conductors or conductor insulation. See also 110.9 for requirements for interrupting ratings and 110.10 for requirements for protection against fault currents.

    • 240.2 Definitions.
    • 240.3 Other Articles.
    • 240.4 Protection of Conductors.
    • 240.5 Protection of Flexible Cords, Flexible Cables, and Fixture Wires.
    • 240.6 Standard Ampere Ratings.
    • 240.8 Fuses or Circuit Breakers in Parallel.
    • 240.9 Thermal Devices.
    • 240.10 Supplementary Overcurrent Protection.
    • 240.12 Electrical System Coordination.
    • 240.13 Ground-Fault Protection of Equipment.
    • 240.15 Ungrounded Conductors.

    • Part II. Location
    • 240.21 Location in Circuit.
    • 240.22 Grounded Conductor.
    • 240.23 Change in Size of Grounded Conductor.
    • 240.24 Location in or on Premises.

    • Part III. Enclosures
    • 240.30 General.
    • 240.32 Damp or Wet Locations.
    • 240.33 Vertical Position.

    • Part IV. Disconnecting and Guarding
    • 240.40 Disconnecting Means for Fuses.
    • 240.41 Arcing or Suddenly Moving Parts.

    • Part V. Plug Fuses, Fuseholders, and Adapters
    • 240.50 General.
    • 240.51 Edison-Base Fuses.
    • 240.52 Edison-Base Fuseholders.
    • 240.53 Type S Fuses.
    • 240.54 Type S Fuses, Adapters, and Fuseholders.

    • Part VI. Cartridge Fuses and Fuseholders
    • 240.60 General.
    • 240.61 Classification.
    • 240.67 Arc Energy Reduction.

    • Part VII. Circuit Breakers
    • 240.80 Method of Operation.
    • 240.81 Indicating.
    • 240.82 Nontamperable.
    • 240.83 Marking.
    • 240.85 Applications.
    • 240.86 Series Ratings.
    • 240.87 Arc Energy Reduction.

    • Part VIII. Supervised Industrial Installations
    • 240.90 General.
    • 240.91 Protection of Conductors.
    • 240.92 Location in Circuit.

    • Part IX. Overcurrent Protection over 1000 Volts, Nominal
    • 240.100 Feeders and Branch Circuits.
    • 240.101 Additional Requirements for Feeders.
  20. Article 250
    Chapter 2 — Wiring and Protection

    Article 250 - Grounding and Bonding

    • Part I. General
    • 250.1 Scope.

    • This article covers general requirements for grounding and bonding of electrical installations, and the specific requirements in (1) through (6).
    • (1)
    • Systems, circuits, and equipment required, permitted, or not permitted to be grounded

    • (2)
    • Circuit conductor to be grounded on grounded systems

    • (3)
    • Location of grounding connections

    • (4)
    • Types and sizes of grounding and bonding conductors and electrodes

    • (5)
    • Methods of grounding and bonding

    • (6)
    • Conditions under which guards, isolation, or insulation may be substituted for grounding

    • Informational Note: See Figure 250.1 for information on the organization of Article 250 covering grounding and bonding requirements.
    • 250.2 Definition.
    • 250.3 Application of Other Articles.
    • 250.4 General Requirements for Grounding and Bonding.
    • 250.6 Objectionable Current.
    • 250.8 Connection of Grounding and Bonding Equipment.
    • 250.10 Protection of Ground Clamps and Fittings.
    • 250.12 Clean Surfaces.

    • Part II. System Grounding
    • 250.20 Alternating-Current Systems to Be Grounded.
    • 250.21 Alternating-Current Systems of 50 Volts to 1000 Volts Not Required to Be Grounded.
    • 250.22 Circuits Not to Be Grounded.
    • 250.24 Grounding Service-Supplied Alternating-Current Systems.
    • 250.26 Conductor to Be Grounded — Alternating-Current Systems.
    • 250.28 Main Bonding Jumper and System Bonding Jumper.
    • 250.30 Grounding Separately Derived Alternating-Current Systems.
    • 250.32 Buildings or Structures Supplied by a Feeder(s) or Branch Circuit(s).
    • 250.34 Portable and Vehicle-Mounted Generators.
    • 250.35 Permanently Installed Generators.
    • 250.36 High-Impedance Grounded Neutral Systems.

    • Part III. Grounding Electrode System and Grounding Electrode Conductor
    • 250.50 Grounding Electrode System.
    • 250.52 Grounding Electrodes.
    • 250.53 Grounding Electrode System Installation.
    • 250.54 Auxiliary Grounding Electrodes.
    • 250.58 Common Grounding Electrode.
    • 250.60 Use of Strike Termination Devices.
    • 250.62 Grounding Electrode Conductor Material.
    • 250.64 Grounding Electrode Conductor Installation.
    • 250.66 Size of Alternating-Current Grounding Electrode Conductor.
    • 250.68 Grounding Electrode Conductor and Bonding Jumper Connection to Grounding Electrodes.
    • 250.70 Methods of Grounding and Bonding Conductor Connection to Electrodes.

    • Part IV. Enclosure, Raceway, and Service Cable Connections
    • 250.80 Service Raceways and Enclosures.
    • 250.84 Underground Service Cable or Raceway.
    • 250.86 Other Conductor Enclosures and Raceways.

    • Part V. Bonding
    • 250.90 General.
    • 250.92 Services.
    • 250.94 Bonding for OtherCommunication Systems.
    • 250.96 Bonding Other Enclosures.
    • 250.97 Bonding for Over 250 Volts.
    • 250.98 Bonding Loosely Jointed Metal Raceways.
    • 250.100 Bonding in Hazardous (Classified) Locations.
    • 250.102 Grounded Conductor, Bonding Conductors, and Jumpers.
    • 250.104 Bonding of Piping Systems and Exposed Structural Metal.
    • 250.106 Lightning Protection Systems.

    • Part VI. Equipment Grounding and Equipment Grounding Conductors
    • 250.110 Equipment Fastened in Place (Fixed) or Connected by Permanent Wiring Methods.
    • 250.112 Specific Equipment Fastened in Place (Fixed) or Connected by Permanent Wiring Methods.
    • 250.114 Equipment Connected by Cord and Plug.
    • 250.116 Nonelectrical Equipment.
    • 250.118 Types of Equipment Grounding Conductors.
    • 250.119 Identification of Equipment Grounding Conductors.
    • 250.120 Equipment Grounding Conductor Installation.
    • 250.121 Use of Equipment Grounding Conductors.
    • 250.122 Size of Equipment Grounding Conductors.
    • 250.124 Equipment Grounding Conductor Continuity.
    • 250.126 Identification of Wiring Device Terminals.

    • Part VII. Methods of Equipment Grounding
    • 250.130 Equipment Grounding Conductor Connections.
    • 250.132 Short Sections of Raceway.
    • 250.134 Equipment Fastened in Place or Connected by Permanent Wiring Methods (Fixed) — Grounding.
    • 250.136 Equipment Considered Grounded.
    • 250.138 Cord-and-Plug-Connected Equipment.
    • 250.140 Frames of Ranges and Clothes Dryers.
    • 250.142 Use of Grounded Circuit Conductor for Grounding Equipment.
    • 250.144 Multiple Circuit Connections.
    • 250.146 Connecting Receptacle Grounding Terminal to Box.
    • 250.148 Continuity and Attachment of Equipment Grounding Conductors to Boxes.

    • Part VIII. Direct-Current Systems
    • 250.160 General.
    • 250.162 Direct-Current Circuits and Systems to Be Grounded.
    • 250.164 Point of Connection for Direct-Current Systems.
    • 250.166 Size of the Direct-Current Grounding Electrode Conductor.
    • 250.167 Direct-Current Ground-Fault Detection.
    • 250.168 Direct-Current System Bonding Jumper.
    • 250.169 Ungrounded Direct-Current Separately Derived Systems.

    • Part IX. Instruments, Meters, and Relays
    • 250.170 Instrument Transformer Circuits.
    • 250.172 Instrument Transformer Cases.
    • 250.174 Cases of Instruments, Meters, and Relays Operating at 1000 Volts or Less.
    • 250.176 Cases of Instruments, Meters, and Relays — Operating at 1000 Volts and Over.
    • 250.178 Instrument Equipment Grounding Conductor.

    • Part X. Grounding of Systems and Circuits of over 1000 Volts
    • 250.180 General.
    • 250.182 Derived Neutral Systems.
    • 250.184 Solidly Grounded Neutral Systems.
    • 250.186 Ground-Fault Circuit Conductor Brought to Service EquipmentGrounding Service-Supplied Alternating-Current Systems.
    • 250.187 Impedance Grounded Neutral Systems.
    • 250.188 Grounding of Systems Supplying Portable or Mobile Equipment.
    • 250.190 Grounding of Equipment.
    • 250.191 Grounding System at Alternating-Current Substations.
    • 250.194 Grounding and Bonding of Fences and Other Metal Structures.
  21. Article 280
    • Article 280 - Surge Arresters, Over 1000 Volts

    • Part I. General
    • 280.1 Scope.
    • This article covers general requirements, installation requirements, and connection requirements for surge arresters installed on premises wiring systems over 1000 volts.

    • 280.3 Number Required.
    • 280.4 Surge Arrester Selection.
    • Part II. Installation

    • 280.11 Location.
    • 280.12 Uses Not Permitted.
    • 280.14 Routing of Surge Arrester Grounding Conductors.
    • Part III. Connecting Surge Arresters

    • 280.21 Connection.
    • 280.23 Surge-Arrester Conductors.
    • 280.24 Interconnections.
    • 280.25 Grounding Electrode Conductor Connections and Enclosures.
  22. Article 285
    • Article 285 - Surge-Protective Devices (SPDs), 1000 Volts or Less

    • Part I. General
    • 285.1 Scope.

    This article covers general requirements, installation requirements, and connection requirements for surge-protective devices (SPDs) permanently installed on premises wiring systems of 1000 volts or less.

    Informational Note: Surge arresters 1000 volts or less are also known as Type 1 SPDs.

    The delineation between SPDs covered by Article 280 and those covered by Article 285 is the voltage rating of the supply system. The designations of SPDs are varied, depending on their location in the premises wiring system. For instance, a Type 1 SPD is permitted to be connected on the supply side of the service or building disconnecting means. Type 2 and Type 3 SPDs must be installed on the load side of overcurrent protective devices and are the devices formerly referred to by this article as TVSSs.

    • 285.3 Uses Not Permitted.
    • 285.4 Number Required.285.6 Listing.285.7 Short-Circuit Current Rating.

    • Part II. Installation
    • 285.11 Location.
    • 285.12 Routing of Connections.
    • 285.13 Type 4 and Other Component Type SPDs.

    • Part III. Connecting SPDs
    • 285.21 Connection.
    • 285.23 Type 1 SPDs.
    • 285.24 Type 2 SPDs.
    • 285.25 Type 3 SPDs.
    • 285.26 Conductor Size.
    • 285.27 Connection Between Conductors.
    • 285.28 Grounding Electrode Conductor Connections and Enclosures.
  23. Article 300
    • Article 300 - General Requirements for Wiring Methods and Materials

    Part I. General Requirements

    • 300.1 Scope.
    • 300.2 Limitations.
    • 300.3 Conductors.
    • 300.4 Protection Against Physical Damage.
    • 300.5 Underground Installations.
    • 300.6 Protection Against Corrosion and Deterioration.
    • 300.7 Raceways Exposed to Different Temperatures.
    • 300.8 Installation of Conductors with Other Systems.
    • 300.9 Raceways in Wet Locations Abovegrade.
    • 300.10 Electrical Continuity of Metal Raceways and Enclosures.
    • 300.11 Securing and Supporting.
    • 300.12 Mechanical Continuity — Raceways and Cables.
    • 300.13 Mechanical and Electrical Continuity — Conductors.
    • 300.14 Length of Free Conductors at Outlets, Junctions, and Switch Points.
    • 300.15 Boxes, Conduit Bodies, or Fittings — Where Required.
    • 300.16 Raceway or Cable to Open or Concealed Wiring.
    • 300.17 Number and Size of Conductors in Raceway.
    • 300.18 Raceway Installations.
    • 300.19 Supporting Conductors in Vertical Raceways.
    • 300.20 Induced Currents in Ferrous Metal Enclosures or Ferrous Metal Raceways.
    • 300.21 Spread of Fire or Products of Combustion.
    • 300.22 Wiring in Ducts Not Used for Air Handling, Fabricated Ducts for Environmental Air, and Other Spaces for Environmental Air (Plenums).
    • 300.23 Panels Designed to Allow Access.
    • Part II. Requirements for over 1000 Volts, Nominal

    • 300.31 Covers Required.
    • 300.32 Conductors of Different Systems.
    • 300.34 Conductor Bending Radius.
    • 300.35 Protection Against Induction Heating.
    • 300.37 Aboveground Wiring Methods.
    • 300.38 Raceways in Wet Locations Above Grade.
    • 300.39 Braid-Covered Insulated Conductors — Exposed Installation.
    • 300.40 Insulation Shielding.
    • 300.42 Moisture or Mechanical Protection for Metal-Sheathed Cables.
    • 300.45 Warning Signs.
    • 300.50 Underground Installations.
  24. Article 310
    Chapter 3 — Wiring Methods and Materials

    Article 310 - Conductors for General Wiring

    • Part I. General
    • 310.1 Scope.
    • 310.2 Definitions.
    • Part II. Installation

    • 310.10 Uses Permitted.
    • 310.15 Ampacities for Conductors Rated 0–2000 Volts.
    • 310.60 Conductors Rated 2001 to 35,000 Volts.
    • Part III. Construction Specifications

    • 310.104 Conductor Constructions and Applications.
    • 310.106 Conductors.
    • 310.110 Conductor Identification.
    • 310.120 Marking.
  25. Article 330
    Chapter 3 — Wiring Methods and Materials

    Article 330 - Metal-Clad Cable: Type MC

    • Part I. General
    • 330.1 Scope.
    • 330.2 Definition.
    • 330.6 Listing Requirements.
    • Part II. Installation

    • 330.10 Uses Permitted.
    • 330.12 Uses Not Permitted.
    • 330.15 Exposed Work.
    • 330.17 Through or Parallel to Framing Members.
    • 330.23 In Accessible Attics.
    • 330.24 Bending Radius.
    • 330.30 Securing and Supporting.
    • 330.31 Single Conductors.
    • 330.80 Ampacity.
    • Part III. Construction Specifications

    • 330.104 Conductors.
    • 330.108 Equipment Grounding Conductor.
    • 330.112 Insulation.
    • 330.116 Sheath.
  26. Article 334
    Article 334

    Chapter 3 — Wiring Methods and Materials

    Article 334 - Nonmetallic-Sheathed Cable: Types NM, NMC, and NMS

    • Part I. General
    • 334.1 Scope.
    • 334.2 Definitions.
    • 334.6 ListedListing Requirements.
    • Part II. Installation

    • 334.10 Uses Permitted.
    • 334.12 Uses Not Permitted.
    • 334.15 Exposed Work.
    • 334.17 Through or Parallel to Framing Members.
    • 334.23 In Accessible Attics.
    • 334.24 Bending Radius.
    • 334.30 Securing and Supporting.
    • 334.40 Boxes and Fittings.
    • 334.80 Ampacity.
    • Part III. Construction Specifications

    • 334.100 Construction.
    • 334.104 Conductors.
    • 334.108 Equipment Grounding Conductor.
    • 334.112 Insulation.
    • 334.116 Sheath.
  27. Article 332
    Chapter 3 — Wiring Methods and Materials

    Article 332 - Mineral-Insulated, Metal-Sheathed Cable: Type MI

    • Part I. General
    • 332.1 Scope.
    • 332.2 Definition.
    • 332.6 Listing Requirements.
    • Part II. Installation

    • 332.10 Uses Permitted.
    • 332.12 Uses Not Permitted.
    • 332.17 Through or Parallel to Framing Members.
    • 332.24 Bending Radius.
    • 332.30 Securing and Supporting.
    • 332.31 Single Conductors.
    • 332.40 Boxes and Fittings.
    • 332.80 Ampacity.
    • Part III. Construction Specifications

    • 332.104 Conductors.
    • 332.108 Equipment Grounding Conductor.
    • 332.112 Insulation.
    • 332.116 Sheath.
  28. Article 338
    Chapter 3 — Wiring Methods and Materials

    Article 338 - Service-Entrance Cable: Types SE and USE

    • Part I. General
    • 338.1 Scope.
    • 338.2 Definitions.
    • 338.6 Listing Requirements.
    • Part II. Installation

    • 338.10 Uses Permitted.
    • 338.12 Uses Not Permitted.
    • 338.24 Bending Radius.
    • Part III. Construction Specifications

    • 338.100 Construction.
    • 338.120 Marking.
  29. Article 344
    Chapter 3 — Wiring Methods and Materials

    Article 344 - Rigid Metal Conduit: Type RMC

    • Part I. General
    • 344.1 Scope.
    • 344.2 Definition.
    • 344.6 Listing Requirements.
    • Part II. Installation

    • 344.10 Uses Permitted.
    • 344.14 Dissimilar Metals.
    • 344.20 Size.
    • 344.22 Number of Conductors.
    • 344.24 Bends — How Made.
    • 344.26 Bends — Number in One Run.
    • 344.28 Reaming and Threading.
    • 344.30 Securing and Supporting.
    • 344.42 Couplings and Connectors.
    • 344.46 Bushings.
    • 344.56 Splices and Taps.
    • 344.60 Grounding.
    • Part III. Construction Specifications

    • 344.100 Construction.
    • 344.120 Marking.
    • 344.130 Standard Lengths.
  30. Article 348
    Chapter 3 — Wiring Methods and Materials

    Article 348 - Flexible Metal Conduit: Type FMC

    • Part I. General
    • 348.1 Scope.
    • 348.2 Definition.
    • 348.6 Listing Requirements.
    • Part II. Installation

    • 348.10 Uses Permitted.
    • 348.12 Uses Not Permitted.
    • 348.20 Size.
    • 348.22 Number of Conductors.
    • 348.24 Bends — How Made.
    • 348.26 Bends — Number in One Run.
    • 348.28 Trimming.
    • 348.30 Securing and Supporting.
    • 348.42 Couplings and Connectors.
    • 348.56 Splices and Taps.
    • 348.60 Grounding and Bonding.
  31. Article 350
    Chapter 3 — Wiring Methods and Materials

    Article 350 - Liquidtight Flexible Metal Conduit: Type LFMC

    • Part I. General
    • 350.1 Scope.
    • 350.2 Definition.
    • 350.6 Listing Requirements.
    • Part II. Installation

    • 350.10 Uses Permitted.
    • 350.12 Uses Not Permitted.
    • 350.20 Size.
    • 350.22 Number of Conductors or Cables.
    • 350.24 Bends — How Made.
    • 350.26 Bends — Number in One Run.
    • 350.28 Trimming.
    • 350.30 Securing and Supporting.
    • 350.42 Couplings and Connectors.
    • 350.56 Splices and Taps.
    • 350.60 Grounding and Bonding.
    • Part III. Construction Specifications

    350.120 Marking.
  32. Article 352
    Chapter 3 — Wiring Methods and Materials

    Article 352 - Rigid Polyvinyl Chloride Conduit: Type PVC

    • Part I. General
    • 352.1 Scope.
    • 352.2 Definition.
    • 352.6 Listing Requirements.
    • Part II. Installation

    • 352.10 Uses Permitted.
    • 352.12 Uses Not Permitted.
    • 352.20 Size.
    • 352.22 Number of Conductors.
    • 352.24 Bends — How Made.
    • 352.26 Bends — Number in One Run.
    • 352.28 Trimming.
    • 352.30 Securing and Supporting.
    • 352.44 Expansion Fittings.
    • 352.46 Bushings.
    • 352.48 Joints.
    • 352.56 Splices and Taps.
    • 352.60 Grounding.
    • Part III. Construction Specifications

    • 352.100 Construction.
    • 352.120 Marking.
  33. Article 356
    Chapter 3 — Wiring Methods and Materials

    Article 356 - Liquidtight Flexible Nonmetallic Conduit: Type LFNC

    • Part I. General
    • 356.1 Scope.
    • 356.2 Definition.
    • 356.6 Listing Requirements.
    • Part II. Installation

    • 356.10 Uses Permitted.
    • 356.12 Uses Not Permitted.
    • 356.20 Size.
    • 356.22 Number of Conductors.
    • 356.24 Bends — How Made.
    • 356.26 Bends — Number in One Run.
    • 356.28 Trimming.
    • 356.30 Securing and Supporting.
    • 356.42 Couplings and Connectors.
    • 356.56 Splices and Taps.
    • 356.60 Grounding.
    • Part III. Construction Specifications

    • 356.100 Construction.
    • 356.120 Marking.
  34. Article 358
    Chapter 3 — Wiring Methods and Materials

    Article 358 - Electrical Metallic Tubing: Type EMT

    • Part I. General
    • 358.1 Scope.
    • 358.2 Definition.
    • 358.6 Listing Requirements.
    • Part II. Installation

    • 358.10 Uses Permitted.
    • 358.12 Uses Not Permitted.
    • 358.14 Dissimilar Metals.
    • 358.20 Size.
    • 358.22 Number of Conductors.
    • 358.24 Bends — How Made.
    • 358.26 Bends — Number in One Run.
    • 358.28 Reaming and Threading.
    • 358.30 Securing and Supporting.
    • 358.42 Couplings and Connectors.
    • 358.56 Splices and Taps.
    • 358.60 Grounding.
    • Part III. Construction Specifications

    • 358.100 Construction.
    • 358.120 Marking.
  35. Article 360
    Chapter 3 — Wiring Methods and Materials

    Article 360 - Flexible Metallic Tubing: Type FMT

    • Part I. General
    • 360.1 Scope.
    • 360.2 Definition.
    • 360.6 Listing Requirements.
    • Part II. Installation

    • 360.10 Uses Permitted.
    • 360.12 Uses Not Permitted.
    • 360.20 Size.
    • 360.22 Number of Conductors.
    • 360.24 Bends.
    • 360.56 Splices and Taps.
    • 360.60 Grounding.
    • Part III. Construction Specifications

    360.120 Marking.
  36. Article 362
    Chapter 3 — Wiring Methods and Materials

    Article 362 - Electrical Nonmetallic Tubing: Type ENT

    • Part I. General
    • 362.1 Scope.
    • 362.2 Definition.
    • 362.6 Listing Requirements.
    • Part II. Installation

    • 362.10 Uses Permitted.
    • 362.12 Uses Not Permitted.
    • 362.20 Size.
    • 362.22 Number of Conductors.
    • 362.24 Bends — How Made.
    • 362.26 Bends — Number in One Run.
    • 362.28 Trimming.
    • 362.30 Securing and Supporting.
    • 362.46 Bushings.
    • 362.48 Joints.
    • 362.56 Splices and Taps.
    • 362.60 Grounding.
    • Part III. Construction Specifications

    • 362.100 Construction.
    • 362.120 Marking.
  37. Article 394
    Chapter 3 — Wiring Methods and Materials

    Article 394 - Concealed Knob-and-Tube Wiring

    Article 394, Concealed Knob-and-Tube Wiring, is still in the Code because there are existing installations. Its only application today is for extensions to those existing installations. It is allowed elsewhere by special permission, but I don’t see that happening often. As this is an obsolete wiring system, there hasn’t been any Code activity in some time. A few cycles back there was a proposal for an article on historic wiring. The Code panel did not agree that it was a viable idea.

    • Part I. General
    • 394.1 Scope.
    • 394.2 Definition.
    • Part II. Installation

    • 394.10 Uses Permitted.
    • 394.12 Uses Not Permitted.
    • 394.17 Through or Parallel to Framing Members.
    • 394.19 Clearances.
    • 394.23 In Accessible Attics.
    • 394.30 Securing and Supporting.
    • 394.42 Devices.
    • 394.56 Splices and Taps.
    • Part III. Construction Specifications

    394.104 Conductors.
  38. Article 396
    Chapter 3 — Wiring Methods and Materials

    Article 399

    Chapter 3 — Wiring Methods and Materials

    Article 399 - Outdoor Overhead Conductors over 1000 Volts

    Article 399, Outdoor Overhead Conductors Over 1,000 Volts, first appeared in the 2011 Code . Most overhead transmission and distribution systems are operated by public utilities, which are governed by the National Electrical Safety Code (NESC). However, some college campuses, military bases and industrial parks have privately owned systems not maintained by utilities. The NESC has many pages addressing hazards to overhead conductors, including wind loading, ice loading and sag. Such hazards also exist on private distribution systems. Article 399 is written in performance-based language to permit industry standards to be used for these installations, which would allow installations to comply with the NESC.

    • 399.1 Scope.
    • 399.2 Definition.
    • 399.10 Uses Permitted.
    • 399.30 Support.
  39. Article 400
    Chapter 4 — Equipment for General Use

    Article 400 - Flexible Cords and Flexible Cables

    • Part I. General
    • 400.1 Scope.
    • 400.2 Other Articles.
    • 400.3 Suitability.
    • 400.4 Types.
    • 400.5 Ampacities for Flexible Cords and Flexible Cables.
    • 400.6 Markings.
    • 400.10 Uses Permitted.
    • 400.12 Uses Not Permitted.
    • 400.13 Splices.
    • 400.14 Pull at Joints and Terminals.
    • 400.15 In Show Windows and Showcases.
    • 400.16 Overcurrent Protection.
    • 400.17 Protection from Damage.
    • Part II. Construction Specifications

    • 400.20 Labels.
    • 400.21 Construction.
    • 400.22 Grounded-Conductor Identification.
    • 400.23 Equipment Grounding Conductor Identification.
    • 400.24 Attachment Plugs.
    • Part III. Portable Cables Over 600 Volts, Nominal

    • 400.30 Scope.
    • 400.31 Construction.
    • 400.32 Shielding.
    • 400.33 Equipment Grounding Conductors.
    • 400.34 Minimum Bending Radii.
    • 400.35 Fittings.
    • 400.36 Splices and Terminations.
  40. Article 404
    Chapter 4 — Equipment for General Use

    Article 404 - Switches

    • Part I. Installation
    • 404.1 Scope.
    • 404.2 Switch Connections.
    • 404.3 Enclosure.
    • 404.4 Damp or Wet Locations.
    • 404.5 Time Switches, Flashers, and Similar Devices.
    • 404.6 Position and Connection of Switches.
    • 404.7 Indicating.
    • 404.8 Accessibility and Grouping.
    • 404.9 Provisions for General-Use Snap Switches.
    • 404.10 Mounting of Snap Switches.
    • 404.11 Circuit Breakers as Switches.
    • 404.12 Grounding of Enclosures.
    • 404.13 Knife Switches.
    • 404.14 Rating and Use of Snap Switches.
    • Part II. Construction Specifications

    • 404.20 Marking.
    • 404.22 Electronic Lighting Control Switches.
    • 404.26 Knife Switches Rated 600 to 1000 Volts.
    • 404.27 Fused Switches.
    • 404.28 Wire-Bending Space.
  41. Article 406
    Chapter 4 — Equipment for General Use

    Article 406 - Receptacles, Cord Connectors, and Attachment Plugs (Caps)

    • 406.1 Scope.
    • 406.2 DefinitionDefinitions.
    • 406.3 Receptacle Rating and Type.
    • 406.4 General Installation Requirements.
    • 406.5 Receptacle Mounting.
    • 406.6 Receptacle Faceplates (Cover Plates).
    • 406.7 Attachment Plugs, Cord Connectors, and Flanged Surface Devices.
    • 406.8 Noninterchangeability.
    • 406.9 Receptacles in Damp or Wet Locations.
    • 406.10 Grounding-Type Receptacles, Adapters, Cord Connectors, and Attachment Plugs.
    • 406.11 Connecting Receptacle Grounding Terminal to Box.
    • 406.12 Tamper-Resistant Receptacles.
  42. Article 408
    Chapter 4 — Equipment for General Use

    Article 408 - Switchboards, Switchgear, and Panelboards

    • Part I. General
    • 408.1 Scope.
    • 408.2 Other Articles.
    • 408.3 Support and Arrangement of Busbars and Conductors.
    • 408.4 Field Identification Required.
    • 408.5 Clearance for Conductor Entering Bus Enclosures.
    • 408.7 Unused Openings.
    • Part II. Switchboards and Switchgear

    • 408.16 Switchboards and Switchgear in Damp or Wet Locations.
    • 408.17 Location Relative to Easily Ignitible Material.
    • 408.18 Clearances.
    • 408.19 Conductor Insulation.
    • 408.20 Location of Switchboards and Switchgear.
    • 408.22 Grounding of Instruments, Relays, Meters, and Instrument Transformers on Switchboards and Switchgear.
    • Part III. Panelboards

    • 408.30 General.
    • 408.36 Overcurrent Protection.
    • 408.37 Panelboards in Damp or Wet Locations.
    • 408.38 Enclosure.
    • 408.39 Relative Arrangement of Switches and Fuses.
    • 408.40 Grounding of Panelboards.
    • 408.41 Grounded Conductor Terminations.
    • Part IV. Construction Specifications

    • 408.50 Panels.
    • 408.51 Busbars.
    • 408.52 Protection of Instrument Circuits.
    • 408.53 Component Parts.
    • 408.54 Maximum Number of Overcurrent Devices.
    • 408.55 Wire-Bending Space Within an Enclosure Containing a Panelboard.
    • 408.56 Minimum Spacings.
    • 408.58 Panelboard Marking.
  43. Article 409
    Chapter 4 — Equipment for General Use

    Article 409 - Industrial Control Panels

    • Part I. General
    • 409.1 Scope.
    • 409.3 Other Articles.
    • Part II. Installation

    • 409.20 Conductor — Minimum Size and Ampacity.
    • 409.21 Overcurrent Protection.
    • 409.22 Short-Circuit Current Rating.
    • 409.30 Disconnecting Means.
    • 409.60 Grounding.
    • Part III. Construction Specifications

    • 409.100 Enclosures.
    • 409.102 Busbars and Conductors.
    • 409.104 Wiring Space.
    • 409.106 Spacings.
    • 409.108 Service Equipment.
    • 409.110 Marking.
  44. Article 410
    Chapter 4 — Equipment for General Use

    Article 410 - Luminaires, Lampholders, and Lamps

    • Part I. General
    • 410.1 Scope.
    • 410.2 Definition.
    • 410.5 Live Parts.
    • 410.6 Listing Required.
    • 410.8 Inspection.
    • Part II. Luminaire Locations

    • 410.10 Luminaires in Specific Locations.
    • 410.11 Luminaires Near Combustible Material.
    • 410.12 Luminaires over Combustible Material.
    • 410.14 Luminaires in Show Windows.
    • 410.16 Luminaires in Clothes Closets.
    • 410.18 Space for Cove Lighting.
    • Part III. Provisions at Luminaire Outlet Boxes, Canopies, and Pans

    • 410.20 Space for Conductors.
    • 410.21 Temperature Limit of Conductors in Outlet Boxes.
    • 410.22 Outlet Boxes to Be Covered.
    • 410.23 Covering of Combustible Material at Outlet Boxes.
    • 410.24 Connection of Electric-Discharge and LED Luminaires.
    • Part IV. Luminaire Supports

    • 410.30 Supports.
    • 410.36 Means of Support.
    • Part V. Grounding

    • 410.40 General.
    • 410.42 Luminaire(s) with Exposed Conductive Parts.
    • 410.44 Methods of Grounding.
    • 410.46 Equipment Grounding Conductor Attachment.
    • Part VI. Wiring of Luminaires

    • 410.48 Luminaire Wiring — General.
    • 410.50 Polarization of Luminaires.
    • 410.52 Conductor Insulation.
    • 410.54 Pendant Conductors for Incandescent Filament Lamps.
    • 410.56 Protection of Conductors and Insulation.
    • 410.59 Cord-Connected Showcases.
    • 410.62 Cord-Connected Lampholders and Luminaires.
    • 410.64 Luminaires as Raceways.
    • 410.68 Feeder and Branch-Circuit Conductors and Ballasts.
    • Part VII. Construction of Luminaires

    • 410.70 Combustible Shades and Enclosures.
    • 410.74 Luminaire Rating.
    • 410.82 Portable Luminaires.
    • 410.84 Cord Bushings.
    • Part VIII. Installation of Lampholders

    • 410.90 Screw Shell Type.
    • 410.93 Double-Pole Switched Lampholders.
    • 410.96 Lampholders in Wet or Damp Locations.
    • 410.97 Lampholders Near Combustible Material.
    • Part IX. Lamps and Auxiliary Equipment

    • 410.103 Bases, Incandescent Lamps.
    • 410.104 Electric-Discharge Lamp Auxiliary Equipment.
    • Part X. Special Provisions for Flush and Recessed Luminaires

    • 410.110 General.
    • 410.115 Temperature.
    • 410.116 Clearance and Installation.
    • 410.117 Wiring.
    • Part XI. Construction of Flush and Recessed Luminaires

    • 410.118 Temperature.
    • 410.120 Lamp Wattage Marking.
    • 410.121 Solder Prohibited.
    • 410.122 Lampholders.
    • Part XII. Special Provisions for Electric-Discharge Lighting Systems of 1000 Volts or Less

    • 410.130 General.
    • 410.134 Direct-Current Equipment.
    • 410.135 Open-Circuit Voltage Exceeding 300 Volts.
    • 410.136 Luminaire Mounting.
    • 410.137 Equipment Not Integral with Luminaire.
    • 410.138 Autotransformers.
    • 410.139 Switches.
    • Part XIII. Special Provisions for Electric-Discharge Lighting Systems of More Than 1000 Volts

    • 410.140 General.
    • 410.141 Control.
    • 410.142 Lamp Terminals and Lampholders.
    • 410.143 Transformers.
    • 410.144 Transformer Locations.
    • 410.145 Exposure to Damage.
    • 410.146 Marking.
    • Part XIV. Lighting Track

    • 410.151 Installation.
    • 410.153 Heavy-Duty Lighting Track.
    • 410.154 Fastening.
    • 410.155 Construction Requirements.
    • Part XV. Decorative Lighting and Similar Accessories

    410.160 Listing of Decorative Lighting.
  45. Article 411
    Chapter 4 — Equipment for General Use

    Article 411 Low-Voltage Lighting

    Article 411, Low-Voltage Lighting, covers lighting systems that operate at no more that 30V AC or 60V DC. It first appeared in the 1996 Code . Some of the early systems used fixtures suspended from exposed bare conductors.

    • 411.1 Scope.
    • 411.3 Low-Voltage Lighting Systems.
    • 411.4 Listing Required.
    • 411.5 Specific Location Requirements.
    • 411.6 Secondary Circuits.
    • 411.7 Branch Circuit.
    • 411.8 Hazardous (Classified) Locations.
  46. Article 422
    Chapter 4 — Equipment for General Use

    Article 422 - Appliances

    • Part I. General
    • 422.1 Scope.
    • 422.3 Other Articles.
    • 422.4 Live Parts.
    • 422.5 Ground-Fault Circuit-Interrupter (GFCI) Protection for Personnel.
    • 422.6 Listing Required.
    • Part II. Installation

    • 422.10 Branch-Circuit Rating.
    • 422.11 Overcurrent Protection.
    • 422.12 Central Heating Equipment.
    • 422.13 Storage-Type Water Heaters.
    • 422.15 Central Vacuum Outlet Assemblies.
    • 422.16 Flexible Cords.
    • 422.17 Protection of Combustible Material.
    • 422.18 Support of Ceiling-Suspended (Paddle) Fans.
    • 422.19 Space for Conductors.
    • 422.20 Outlet Boxes to Be Covered.
    • 422.21 Covering of Combustible Material at Outlet Boxes.
    • 422.22 Other Installation Methods.
    • Part III. Disconnecting Means

    • 422.30 General.
    • 422.31 Disconnection of Permanently Connected Appliances.
    • 422.33 Disconnection of Cord-and-Plug-Connected or Attachment Fitting–Connected Appliances.
    • 422.34 Unit Switch(es) as Disconnecting Means.
    • 422.35 Switch and Circuit Breaker to Be Indicating.
    • Part IV. Construction

    • 422.40 Polarity in Cord-and Plug-Connected Appliances.
    • 422.41 Cord-and Plug-Connected Appliances Subject to Immersion.
    • 422.42 Signals for Heated Appliances.
    • 422.43 Flexible Cords.
    • 422.44 Cord-and Plug-Connected Immersion Heaters.
    • 422.45 Stands for Cord-and Plug-Connected Appliances.
    • 422.46 Flatirons.
    • 422.47 Water Heater Controls.
    • 422.48 Infrared Lamp Industrial Heating Appliances.
    • 422.50 Cord-and-Plug-Connected Pipe Heating Assemblies.
    • Part V. Marking

    • 422.60 Nameplate.
    • 422.61 Marking of Heating Elements.
    • 422.62 Appliances Consisting of Motors and Other Loads.
  47. Article 430
    Article 430 - Motors, Motor Circuits, and Controllers

    • Part I. General
    • 430.1 Scope.
    • 430.2 Definitions.
    • 430.4 Part-Winding Motors.
    • 430.5 Other Articles.
    • 430.6 Ampacity and Motor Rating Determination.
    • 430.7 Marking on Motors and Multimotor Equipment.
    • 430.8 Marking on Controllers.
    • 430.9 Terminals.
    • 430.10 Wiring Space in Enclosures.
    • 430.11 Protection Against Liquids.
    • 430.12 Motor Terminal Housings.
    • 430.13 Bushing.
    • 430.14 Location of Motors.
    • 430.16 Exposure to Dust Accumulations.
    • 430.17 Highest Rated or Smallest Rated Motor.
    • 430.18 Nominal Voltage of Rectifier Systems.
    • Part II. Motor Circuit Conductors

    • 430.21 General.
    • 430.22 Single Motor.
    • 430.23 Wound-Rotor Secondary.
    • 430.24 Several Motors or a Motor(s) and Other Load(s).
    • 430.25 Multimotor and Combination-Load Equipment.
    • 430.26 Feeder Demand Factor.
    • 430.27 Capacitors with Motors.
    • 430.28 Feeder Taps.
    • 430.29 Constant Voltage Direct-Current Motors — Power Resistors.
    • Part III. Motor and Branch-Circuit Overload Protection

    • 430.31 General.
    • 430.32 Continuous-Duty Motors.
    • 430.33 Intermittent and Similar Duty.
    • 430.35 Shunting During Starting Period.
    • 430.36 Fuses — In Which Conductor.
    • 430.37 Devices Other Than Fuses — In Which Conductor.
    • 430.38 Number of Conductors Opened by Overload Device.
    • 430.39 Motor Controller as Overload Protection.
    • 430.40 Overload Relays.
    • 430.42 Motors on General-Purpose Branch Circuits.
    • 430.43 Automatic Restarting.
    • 430.44 Orderly Shutdown.
    • Part IV. Motor Branch-Circuit Short-Circuit and Ground-Fault Protection

    • 430.51 General.
    • 430.52 Rating or Setting for Individual Motor Circuit.
    • 430.53 Several Motors or Loads on One Branch Circuit.
    • 430.54 Multimotor and Combination-Load Equipment.
    • 430.55 Combined Overcurrent Protection.
    • 430.56 Branch-Circuit Protective Devices — In Which Conductor.
    • 430.57 Size of Fuseholder.
    • 430.58 Rating of Circuit Breaker.
    • Part V. Motor Feeder Short-Circuit and Ground-Fault Protection

    • 430.61 General.
    • 430.62 Rating or Setting — Motor Load.
    • 430.63 Rating or Setting — Motor Load and Other Load(s).
    • Part VI. Motor Control Circuits

    • 430.71 General.
    • 430.72 Overcurrent Protection.
    • 430.73 Protection of Conductors from Physical Damage.
    • 430.74 Electrical Arrangement of Control Circuits.
    • 430.75 Disconnection.
    • Part VII. Motor Controllers

    • 430.81 General.
    • 430.82 Controller Design.
    • 430.83 Ratings.
    • 430.84 Need Not Open All Conductors.
    • 430.85 In Grounded Conductors.
    • 430.87 Number of Motors Served by Each Controller.
    • 430.88 Adjustable-Speed Motors.
    • 430.89 Speed Limitation.
    • 430.90 Combination Fuseholder and Switch as Controller.
    • Part VIII. Motor Control Centers

    • 430.92 General.
    • 430.94 Overcurrent Protection.
    • 430.95 Service Equipment.
    • 430.96 Grounding.
    • 430.97 Busbars and Conductors.
    • 430.98 Marking.
    • 430.99 Available Fault Current.
    • Part IX. Disconnecting Means

    • 430.101 General.
    • 430.102 Location.
    • 430.103 Operation.
    • 430.104 To Be Indicating.
    • 430.105 Grounded Conductors.
    • 430.107 Readily Accessible.
    • 430.108 Every Disconnecting Means.
    • 430.109 Type.
    • 430.110 Ampere Rating and Interrupting Capacity.
    • 430.111 Switch or Circuit Breaker as Both Controller and Disconnecting Means.
    • 430.112 Motors Served by Single Disconnecting Means.
    • 430.113 Energy from More Than One Source.
    • Part X. Adjustable-Speed Drive Systems

    • 430.120 General.
    • 430.122 Conductors — Minimum Size and Ampacity.
    • 430.124 Overload Protection.
    • 430.126 Motor Overtemperature Protection.
    • 430.128 Disconnecting Means.
    • 430.130 Branch-Circuit Short-Circuit and Ground-Fault Protection for Single Motor Circuits Containing Power Conversion Equipment.
    • 430.131 Several Motors or Loads on One Branch Circuit Including Power Conversion Equipment.
    • Part XI. Over 1000 Volts, Nominal

    • 430.221 General.
    • 430.222 Marking on Controllers.
    • 430.223 Raceway Connection to Motors.
    • 430.224 Size of Conductors.
    • 430.225 Motor-Circuit Overcurrent Protection.
    • 430.226 Rating of Motor Control Apparatus.
    • 430.227 Disconnecting Means.
    • Part XII. Protection of Live Parts — All Voltages

    • 430.231 General.
    • 430.232 Where Required.
    • 430.233 Guards for Attendants.
    • Part XIII. Grounding — All Voltages

    • 430.241 General.
    • 430.242 Stationary Motors.
    • 430.243 Portable Motors.
    • 430.244 Controllers.
    • 430.245 Method of Grounding.
  48. Article 440
    Chapter 4 — Equipment for General Use

    Article 440 - Air-Conditioning and Refrigerating Equipment

    • Part I. General
    • 440.1 Scope.
    • 440.2 Definitions.
    • 440.3 Other Articles.
    • 440.4 Marking on Hermetic Refrigerant Motor-Compressors and Equipment.
    • 440.5 Marking on Controllers.
    • 440.6 Ampacity and Rating.
    • 440.7 Highest Rated (Largest) Motor.
    • 440.8 Single Machine.
    • 440.9 Grounding and Bonding.
    • 440.10 Short-Circuit Current Rating.
    • Part II. Disconnecting Means

    • 440.11 General.
    • 440.12 Rating and Interrupting Capacity.
    • 440.13 Cord-Connected Equipment.
    • 440.14 Location.
    • Part III. Branch-Circuit Short-Circuit and Ground-Fault Protection

    • 440.21 General.
    • 440.22 Application and Selection.
    • Part IV. Branch-Circuit Conductors

    • 440.31 General.
    • 440.32 Single Motor-Compressor.
    • 440.33 Motor-Compressor(s) With or Without Additional Motor Loads.
    • 440.34 Combination Load.
    • 440.35 Multimotor and Combination-Load Equipment.
    • Part V. Controllers for Motor-Compressors

    • 440.41 Rating.
    • Part VI. Motor-Compressor and Branch-Circuit Overload Protection

    • 440.51 General.
    • 440.52 Application and Selection.
    • 440.53 Overload Relays.
    • 440.54 Motor-Compressors and Equipment on 15- or 20--⁠Ampere Branch Circuits — Not Cord- and Attachment-Plug-Connected.
    • 440.55 Cord- and Attachment-Plug-Connected Motor-Compressors and Equipment on 15- or 20-Ampere Branch Circuits.
    • Part VII. Provisions for Room Air Conditioners

    • 440.60 General.
    • 440.61 Grounding.
    • 440.62 Branch-Circuit Requirements.
    • 440.63 Disconnecting Means.
    • 440.64 Supply Cords.
    • 440.65 Leakage-Current Detector-Interrupter (LCDI) and Arc-Fault Circuit Interrupter (AFCI)Protection Devices
  49. Article 445
    Chapter 4 — Equipment for General Use

    Article 445 - Generators

    • 445.1 Scope.
    • 445.10 Location.
    • 445.11 Marking.
    • 445.12 Overcurrent Protection.
    • 445.13 Ampacity of Conductors.
    • 445.14 Protection of Live Parts.
    • 445.15 Guards for Attendants.
    • 445.16 Bushings.
    • 445.17 Generator Terminal Housings.
    • 445.18 Disconnecting Means Required for Generatorsand Shutdown of Prime Mover.
    • 445.20 Ground-Fault Circuit-Interrupter Protection for Receptacles on 15-kW or Smaller Portable Generators.
  50. Article 511
    Chapter 5 — Special Occupancies

    Article 511 - Commercial Garages, Repair and Storage

    • 511.1 Scope.
    • 511.2 Definitions.
    • 511.3 Area Classification, General.
    • 511.4 Wiring and Equipment in Class I Locations.
    • 511.7 Wiring and Equipment Installed Above Class I Locations.
    • 511.8 Underground Wiring.
    • 511.9 Sealing.
    • 511.10 Special Equipment.
    • 511.12 Ground-Fault Circuit-Interrupter Protection for Personnel.
    • 511.16 Grounding and Bonding Requirements.
  51. Article 513
    Chapter 5 — Special Occupancies

    Article 513 - Aircraft Hangars

    • 513.1 Scope.
    • 513.2 Definitions.
    • 513.3 Classification of Locations.
    • 513.4 Wiring and Equipment in Class I Locations.
    • 513.7 Wiring and Equipment Not Installed in Class I Locations.
    • 513.8 Underground Wiring.
    • 513.9 Sealing.
    • 513.10 Special Equipment.
    • 513.12 Ground-Fault Circuit-Interrupter Protection for Personnel.
    • 513.16 Grounding and Bonding Requirements.
  52. Article 514
    Chapter 5 — Special Occupancies

    Article 514 - Motor Fuel Dispensing Facilities

    • 514.1 Scope.
    • 514.2 Definition.
    • 514.3 Classification of Locations.
    • 514.4 Wiring and Equipment Installed in Class I Locations.
    • 514.7 Wiring and Equipment Above Class I Locations.
    • 514.8 Underground Wiring.
    • 514.9 Sealing.
    • 514.11 Circuit Disconnects.
    • 514.13 Provisions for Maintenance and Service of Dispensing Equipment.
    • 514.16 Grounding and Bonding.
  53. Article 517
    Chapter 5 — Special Occupancies

    Article 517 - Health Care Facilities

    • Part I. General
    • 517.1 Scope.
    • 517.2 Definitions.
    • Part II. Wiring and Protection

    • 517.10 Applicability.
    • 517.11 General Installation — Construction Criteria.
    • 517.12 Wiring Methods.
    • 517.13 Grounding of Receptacles and Fixed Electrical Equipment in Patient Care AreasSpaces.
    • 517.14 Panelboard Bonding.
    • 517.16 Use of Isolated Ground Receptacles.
    • 517.17 Ground-Fault Protection.
    • 517.18 General Care Areas(Category 2) Spaces.
    • 517.19 Critical Care Areas(Category 1) Spaces.
    • 517.20 Wet Procedure Locations.
    • 517.21 Ground-Fault Circuit-Interrupter Protection for Personnel.
    • Part III. Essential Electrical System

    • 517.25 Scope.
    • 517.26 Application of Other Articles.
    • 517.29 Essential Electrical Systems for Hospitals and Other Health Care Facilities.
    • 517.30 Sources of Power.
    • 517.31 Requirements for the Essential Electrical System.
    • 517.32 Branches Requiring Automatic Connection.
    • 517.33 Life Safety Branch.
    • 517.34 Critical Branch.
    • 517.35 Equipment Branch Connection to Alternate Power Source.
    • 517.40 Type 2 Essential Electrical Systems for Nursing Homes and Limited Care Facilities.
    • 517.41 Sources of PowerRequired Power Sources.
    • 517.42 Essential Electrical Systems.
    • 517.43 Automatic Connection to Life Safety Branch.
    • 517.44 Connection to CriticalEquipment Branch.
    • 517.45 Essential Electrical Systems for Other Health Care Facilities.
    • Part IV. Inhalation Anesthetizing Locations

    • 517.60 Anesthetizing Location Classification.
    • 517.61 Wiring and Equipment.
    • 517.62 Grounding.
    • 517.63 Grounded Power Systems in Anesthetizing Locations.
    • 517.64 Low-Voltage Equipment and Instruments.
    • Part V. X-Ray Installations

    • 517.70 Applicability.
    • 517.71 Connection to Supply Circuit.
    • 517.72 Disconnecting Means.
    • 517.73 Rating of Supply Conductors and Overcurrent Protection.
    • 517.74 Control Circuit Conductors.
    • 517.75 Equipment Installations.
    • 517.76 Transformers and Capacitors.
    • 517.77 Installation of High-Tension X-Ray Cables.
    • 517.78 Guarding and Grounding.
    • Part VI. Communications, Signaling Systems, Data Systems, Fire Alarm Systems, and Systems Less Than 120 Volts, Nominal

    • 517.80 Patient Care AreasSpaces.
    • 517.81 Other-Than-Patient-Care Areas.
    • 517.82 Signal Transmission Between Appliances.
    • Part VII. Isolated Power Systems

    517.160 Isolated Power Systems.
  54. Article 520
    Chapter 5 — Special Occupancies

    Article 520 - Theaters, Audience Areas of Motion Picture and Television Studios, Performance Areas, and Similar Locations

    Part I. General

    • 520.1 Scope.
    • 520.2 Definitions.
    • 520.3 Motion Picture Projectors.
    • 520.4 Audio Signal Processing, Amplification, and Reproduction Equipment.
    • 520.5 Wiring Methods.
    • 520.6 Number of Conductors in Raceway.
    • 520.7 Enclosing and Guarding Live Parts.
    • 520.8 Emergency Systems.
    • 520.9 Branch Circuits.
    • 520.10 Portable Equipment Used Outdoors.
    • Part II. Fixed Stage Switchboards

    • 520.21 General.
    • 520.25 Dimmers.
    • 520.26 Type of Switchboard.
    • 520.27 Stage Switchboard Feeders.
    • Part III. Fixed Stage Equipment Other Than Switchboards

    • 520.40 Stage Lighting Hoists.
    • 520.41 Circuit Loads.
    • 520.42 Conductor Insulation.
    • 520.43 Footlights.
    • 520.44 Borders, Proscenium Sidelights, Drop Boxes, and Connector Strips.
    • 520.45 Receptacles.
    • 520.46 Connector Strips, Drop Boxes, Floor Pockets, and Other Outlet Enclosures.
    • 520.47 Backstage Lamps (Bare Bulbs).
    • 520.48 Curtain Machines.
    • 520.49 Smoke Ventilator Control.
    • Part IV. Portable Switchboards on Stage

    • 520.50 Road Show Connection Panel (A Type of Patch Panel).
    • 520.51 Supply.
    • 520.52 Overcurrent Protection for Branch Circuits.
    • 520.53 Construction and Feeders.
    • 520.54 Supply Conductors.
    • Part V. Portable Stage Equipment Other Than Switchboards

    • 520.61 Arc Lamps.
    • 520.62 Portable Power Distribution Units.
    • 520.63 Bracket Fixture Wiring.
    • 520.64 Portable Strips.
    • 520.65 Festoons.
    • 520.66 Special Effects.
    • 520.67 Multipole Branch-Circuit Cable Connectors.
    • 520.68 Conductors for Portables.
    • 520.69 Adapters.
    • Part VI. Dressing Rooms, Dressing Areas, and Makeup Areas.

    • 520.71 Pendant Lampholders.
    • 520.72 Lamp Guards.
    • 520.73 Switches Required.
    • 520.74 Pilot Lights Required.
    • Part VII. Grounding

    520.81 Grounding.
  55. Article 525
    Chapter 5 — Special Occupancies

    Article 525 - Carnivals, Circuses, Fairs, and Similar Events

    • Part I. General Requirements
    • 525.1 Scope.
    • 525.2 Definitions.
    • 525.3 Other Articles.
    • 525.5 Overhead Conductor Clearances.
    • 525.6 Protection of Electrical Equipment.
    • Part II. Power Sources

    • 525.10 Services.
    • 525.11 Multiple Sources of Supply.
    • Part III. Wiring Methods

    • 525.20 Wiring Methods.
    • 525.21 Rides, Tents, and Concessions.
    • 525.22 Portable Distribution or Termination Boxes.
    • 525.23 Ground-Fault Circuit-Interrupter (GFCI) Protection.
    • Part IV. Grounding and Bonding

    • 525.30 Equipment Bonding.
    • 525.31 Equipment Grounding.
    • 525.32 Equipment Grounding Conductor Continuity Assurance.
  56. Article 540
    Chapter 5 — Special Occupancies

    Article 540 - Motion Picture Projection Rooms

    • Part I. General
    • 540.1 Scope.
    • 540.2 Definitions.
    • Part II. Equipment and Projectors of the Professional Type

    • 540.10 Motion Picture Projection Room Required.
    • 540.11 Location of Associated Electrical Equipment.
    • 540.12 Work Space.
    • 540.13 Conductor Size.
    • 540.14 Conductors on Lamps and Hot Equipment.
    • 540.15 Flexible Cords.
    • 540.20 Listing Requirements.
    • 540.21 Marking.
    • Part III. Nonprofessional Projectors

    • 540.31 Motion Picture Projection Room Not Required.
    • 540.32 Listing Requirements.
    • Part IV. Audio Signal Processing, Amplification, and Reproduction Equipment

    540.50 Audio Signal Processing, Amplification, and Reproduction Equipment.
  57. Article 547
    Chapter 5 — Special Occupancies

    Article 547 - Agricultural Buildings

    • 547.1 Scope.
    • 547.2 Definitions.
    • 547.3 Other Articles.
    • 547.4 Surface Temperatures.
    • 547.5 Wiring Methods.
    • 547.6 Switches, Receptacles, Circuit Breakers, Controllers, and Fuses.
    • 547.7 Motors.
    • 547.8 Luminaires.
    • 547.9 Electrical Supply to Building(s) or Structure(s) from a Distribution Point.
    • 547.10 Equipotential Planes and Bonding of Equipotential Planes.
  58. Article 550
    Chapter 5 — Special Occupancies

    Article 550 - Mobile Homes, Manufactured Homes, and Mobile Home Parks

    Part I. General

    • 550.1 Scope.
    • 550.2 Definitions.
    • 550.4 General Requirements.
    • Part II. Mobile and Manufactured Homes

    • 550.10 Power Supply.
    • 550.11 Disconnecting Means and Branch-Circuit Protective Equipment.
    • 550.12 Branch Circuits.
    • 550.13 Receptacle Outlets.
    • 550.14 Luminaires and Appliances.
    • 550.15 Wiring Methods and Materials.
    • 550.16 Grounding.
    • 550.17 Testing.
    • 550.18 Calculations.
    • 550.19 Interconnection of Multiple-Section Mobile or Manufactured Home Units.
    • 550.20 Outdoor Outlets, Luminaires, Air-Cooling Equipment, and So Forth.
    • 550.25 Arc-Fault Circuit-Interrupter Protection.
    • Part III. Services and Feeders

    • 550.30 Distribution System.
    • 550.31 Allowable Demand Factors.
    • 550.32 Service Equipment.
    • 550.33 Feeder.
  59. Article 553
    Chapter 5 — Special Occupancies

    Article 553 - Floating Buildings

    • Part I. General
    • 553.1 Scope.
    • 553.2 Definition.
    • Part II. Services and Feeders

    • 553.4 Location of Service Equipment.
    • 553.5 Service Conductors.
    • 553.6 Feeder Conductors.
    • 553.7 Installation of Services and Feeders.
    • Part III. Grounding

    • 553.8 General Requirements.
    • 553.9 Insulated Neutral.
    • 553.10 Equipment Grounding.
    • 553.11 Bonding of Non–Current-Carrying Metal Parts.
  60. Article 555
    Chapter 5 — Special Occupancies

    Article 555 - Marinas, Boatyards, and Commercial and Noncommercial Docking Facilities

    • 555.1 Scope.
    • 555.2 Definitions.
    • 555.3 Ground-Fault Protection.
    • 555.4 Distribution System.
    • 555.5 Transformers.
    • 555.7 Location of Service Equipment.
    • 555.9 Electrical Connections.
    • 555.10 Electrical Equipment Enclosures.
    • 555.11 Circuit Breakers, Switches, Panelboards, and Marine Power Outlets.
    • 555.12 Load Calculations for Service and Feeder Conductors.
    • 555.13 Wiring Methods and Installation.
    • 555.15 Grounding.
    • 555.17 Disconnecting Means for Shore Power Connection(s).
    • 555.19 Receptacles.
    • 555.21 Motor Fuel Dispensing Stations — Hazardous (Classified) Locations.
    • 555.22 Repair Facilities — Hazardous (Classified) Locations.
    • 555.23 Marine Hoists, Railways, Cranes, and Monorails.
    • 555.24 Signage.
  61. Article 590
    Chapter 5 — Special Occupancies

    Article 590 - Temporary Installations

    • 590.1 Scope.
    • 590.2 All Wiring Installations.
    • 590.3 Time Constraints.
    • 590.4 General.
    • 590.5 Listing of Decorative Lighting.
    • 590.6 Ground-Fault Protection for Personnel.
    • 590.7 Guarding.
  62. Article 600
    Chapter 6 — Special Equipment

    Article 600 - Electric Signs and Outline Lighting

    • Part I. General
    • 600.1 Scope.
    • 600.2 Definitions.
    • 600.3 Listing.
    • 600.4 Markings.
    • 600.5 Branch Circuits.
    • 600.6 Disconnects.
    • 600.7 Grounding and Bonding.
    • 600.8 Enclosures.
    • 600.9 Location.
    • 600.10 Portable or Mobile Signs.
    • 600.12 Field-Installed Secondary Wiring.
    • 600.21 Ballasts, Transformers, Electronic Power Supplies, and Class 2 Power Sources.
    • 600.22 Ballasts.
    • 600.23 Transformers and Electronic Power Supplies.
    • 600.24 Class 2 Power Sources.
    • Part II. Field-Installed Skeleton Tubing, Outline Lighting, and Secondary Wiring

    • 600.30 Applicability.
    • 600.31 Neon Secondary-Circuit Wiring, 1000 Volts or Less, Nominal.
    • 600.32 Neon Secondary-Circuit Wiring, over 1000 Volts, Nominal.
    • 600.33 LEDClass 2 Sign Illumination Systems, Secondary Wiring.
    • 600.34 Photovoltaic (PV) Powered Sign.
    • 600.41 Neon Tubing.
    • 600.42 Electrode Connections.
  63. Article 610
    Chapter 6 — Special Equipment

    Article 610 - Cranes and Hoists

    • Part I. General
    • 610.1 Scope.
    • 610.2 Definition.
    • 610.3 Special Requirements for Particular Locations.
    • Part II. Wiring

    • 610.11 Wiring Method.
    • 610.12 Raceway or Cable Terminal Fittings.
    • 610.13 Types of Conductors.
    • 610.14 Rating and Size of Conductors.
    • 610.15 Common Return.
    • Part III. Contact Conductors

    • 610.21 Installation of Contact Conductors.
    • 610.22 Collectors.
    • Part IV. Disconnecting Means

    • 610.31 Runway Conductor Disconnecting Means.
    • 610.32 Disconnecting Means for Cranes and Monorail Hoists.
    • 610.33 Rating of Disconnecting Means.
    • Part V. Overcurrent Protection

    • 610.41 Feeders, Runway Conductors.
    • 610.42 Branch-Circuit Short-Circuit and Ground-Fault Protection.
    • 610.43 Overload Protection.
    • Part VI. Control

    • 610.51 Separate Controllers.
    • 610.53 Overcurrent Protection.
    • 610.57 Clearance.
    • Part VII. Grounding

    610.61 Grounding.
  64. Article 620
    Chapter 6 — Special Equipment

    Article 620 - Elevators, Dumbwaiters, Escalators, Moving Walks, Platform Lifts, and Stairway Chairlifts

    Part I. General

    • 620.1 Scope.
    • 620.2 Definitions.
    • 620.3 Voltage Limitations.
    • 620.4 Live Parts Enclosed.
    • 620.5 Working Clearances.
    • Part II. Conductors

    • 620.11 Insulation of Conductors.
    • 620.12 Minimum Size of Conductors.
    • 620.13 Feeder and Branch-Circuit Conductors.
    • 620.14 Feeder Demand Factor.
    • 620.15 Motor Controller Rating.
    • 620.16 Short-Circuit Current Rating.
    • Part III. Wiring

    • 620.21 Wiring Methods.
    • 620.22 Branch Circuits for Car Lighting, Receptacle(s), Ventilation, Heating, and Air-Conditioning.
    • 620.23 Branch Circuits for Machine Room or Control Room/Machinery Space or Control Space Lighting and Receptacle(s).
    • 620.24 Branch Circuit for Hoistway Pit Lighting and Receptacle(s)Receptacles.
    • 620.25 Branch Circuits for Other Utilization Equipment.
    • Part IV. Installation of Conductors

    • 620.32 Metal Wireways and Nonmetallic Wireways.
    • 620.33 Number of Conductors in Raceways.
    • 620.34 Supports.
    • 620.35 Auxiliary Gutters.
    • 620.36 Different Systems in One Raceway or Traveling Cable.
    • 620.37 Wiring in Hoistways, Machine Rooms, Control Rooms, Machinery Spaces, and Control Spaces.
    • 620.38 Electrical Equipment in Garages and Similar Occupancies.
    • Part V. Traveling Cables

    • 620.41 Suspension of Traveling Cables.
    • 620.42 Hazardous (Classified) Locations.
    • 620.43 Location of and Protection for Cables.
    • 620.44 Installation of Traveling Cables.
    • Part VI. Disconnecting Means and Control

    • 620.51 Disconnecting Means.
    • 620.52 Power from More Than One Source.
    • 620.53 Car Light, Receptacle(s), and Ventilation Disconnecting Means.
    • 620.54 Heating and Air-Conditioning Disconnecting Means.
    • 620.55 Utilization Equipment Disconnecting Means.
    • Part VII. Overcurrent Protection

    • 620.61 Overcurrent Protection.
    • 620.62 Selective Coordination.
    • Part VIII. Machine Rooms, Control Rooms, Machinery Spaces, and Control Spaces

    • 620.71 Guarding Equipment.
    • Part IX. Grounding

    • 620.81 Metal Raceways Attached to Cars.
    • 620.82 Electric Elevators.
    • 620.83 Nonelectric Elevators.
    • 620.84 Escalators, Moving Walks, Platform Lifts, and Stairway Chairlifts.
    • 620.85 Ground-Fault Circuit-Interrupter Protection for Personnel.
    • Part X. Emergency and Standby Power Systems

    620.91 Emergency and Standby Power Systems.
  65. Article 625
    Chapter 6 — Special Equipment

    Article 625 - Electric Vehicle Charging System

    • Part I. General
    • 625.1 Scope.
    • 625.2 Definitions.
    • 625.4 Voltages.
    • 625.5 Listed.
    • Part II. Equipment Construction

    • 625.10 Electric Vehicle Coupler.
    • 625.15 Markings.
    • 625.16 Means of Coupling.
    • 625.17 Cords and Cables.
    • 625.18 Interlock.
    • 625.19 Automatic De-Energization of Cable.
    • 625.22 Personnel Protection System.
    • Part III. Installation

    • 625.40 Electric Vehicle Branch Circuit.
    • 625.41 Overcurrent Protection.
    • 625.42 Rating.
    • 625.43 Disconnecting Means.
    • 625.44 Electric Vehicle Supply Equipment Connection.
    • 625.46 Loss of Primary Source.
    • 625.47 Multiple Feeder or Branch Circuits.
    • 625.48 Interactive Systems.
    • 625.50 Location.
    • 625.52 Ventilation.
    • 625.54 Ground-Fault Circuit-Interrupter Protection for Personnel.
    • 625.56 Receptacle Enclosures.
    • Part IV. Wireless Power Transfer Equipment

    • 625.101 Grounding.
    • 625.102 Construction.
  66. Article 630
    Chapter 6 — Special Equipment

    Article 630 - Electric Welders

    • Part I. General
    • 630.1 Scope.
    • 630.6 Listing.
    • Part II. Arc Welders

    • 630.11 Ampacity of Supply Conductors.
    • 630.12 Overcurrent Protection.
    • 630.13 Disconnecting Means.
    • 630.14 Marking.
    • 630.15 Grounding of Welder Secondary Circuit.
    • Part III. Resistance Welders

    • 630.31 Ampacity of Supply Conductors.
    • 630.32 Overcurrent Protection.
    • 630.33 Disconnecting Means.
    • 630.34 Marking.
    • Part IV. Welding Cable

    • 630.41 Conductors.
    • 630.42 Installation.
  67. Article 647
    Chapter 6 — Special Equipment

    Article 647 - Sensitive Electronic Equipment

    Article 647, Sensitive Electronic Equipment, originated as Part G of Article 530, Motion Picture and Television Studios. It applies to separately derived 120V, three-wire, single-phase systems operating at 60V to ground. These circuits are primarily used where there is objectionable noise in sensitive electronic equipment. The primary application has been audio and video systems where there is a need to eliminate noise. These systems are permitted to be used in commercial and industrial establishments, but not residential. The location must be “under close supervision by qualified personnel.” This is one of very few places in the NEC where there is a limit on voltage drop. The limit on branch circuits is 1.5%. The combined voltage drop for feeders and branch circuits is 2.5%. The reason provided was to prevent impedances that might limit the ability of overcurrent devices to operate.

    • 647.1 Scope.
    • 647.3 General.
    • 647.4 Wiring Methods.
    • 647.5 Three-Phase Systems.
    • 647.6 Grounding.
    • 647.7 Receptacles.
    • 647.8 Lighting Equipment.
  68. Article 650
    Chapter 6 — Special Equipment

    Article 650 - Pipe Organs

    Article 650, Pipe Organs, covers large organs used in houses of worship. Modern pipe organs may produce sound electronically or through pressurized air. They are often very large and custom-built systems that are assembled in the field.

    • 650.1 Scope.
    • 650.2 Definitions.
    • 650.3 Other Articles.
    • 650.4 Source of Energy.
    • 650.5 Grounding or Double Insulation of the DC Power Supply.
    • 650.6 Conductors.
    • 650.7 Installation of Conductors.
    • 650.8 Overcurrent Protection.
    • 650.9 Protection from Accidental Contact.
  69. Article 660
    Chapter 6 — Special Equipment

    Article 660 - X-Ray Equipment

    • Part I. General
    • 660.1 Scope.
    • 660.2 Definitions.
    • 660.3 Hazardous (Classified) Locations.
    • 660.4 Connection to Supply Circuit.
    • 660.5 Disconnecting Means.
    • 660.6 Rating of Supply Conductors and Overcurrent Protection.
    • 660.7 Wiring Terminals.
    • 660.9 Minimum Size of Conductors.
    • 660.10 Equipment Installations.
    • Part II. Control

    • 660.20 Fixed and Stationary Equipment.
    • 660.21 Portable and Mobile Equipment.
    • 660.23 Industrial and Commercial Laboratory Equipment.
    • 660.24 Independent Control.
    • Part III. Transformers and Capacitors

    • 660.35 General.
    • 660.36 Capacitors.
    • Part IV. Guarding and Grounding

    • 660.47 General.
    • 660.48 Grounding.
  70. Article 669
    Chapter 6 — Special Equipment

    Article 669 - Electroplating

    • 669.1 Scope.
    • 669.3 General.
    • 669.5 Branch-Circuit Conductors.
    • 669.6 Wiring Methods.
    • 669.7 Warning Signs.
    • 669.8 Disconnecting Means.
    • 669.9 Overcurrent Protection.
  71. Article 675
    Chapter 6 — Special Equipment

    Article 675 - Electrically Driven or Controlled Irrigation Machines

    Article 675 covers electrically driven irrigation machines, and these are occasionally found in rural areas where three-phase power is not available. They may be supplied by a phase converter, which is governed by the requirements of Article 455.

    • Part I. General
    • 675.1 Scope.
    • 675.2 Definitions.
    • 675.4 Irrigation Cable.
    • 675.5 More Than Three Conductors in a Raceway or Cable.
    • 675.6 Marking on Main Control Panel.
    • 675.7 Equivalent Current Ratings.
    • 675.8 Disconnecting Means.
    • 675.9 Branch-Circuit Conductors.
    • 675.10 Several Motors on One Branch Circuit.
    • 675.11 Collector Rings.
    • 675.12 Grounding.
    • 675.13 Methods of Grounding.
    • 675.14 Bonding.
    • 675.15 Lightning Protection.
    • 675.16 Energy from More Than One Source.
    • 675.17 Connectors.
    • Part II. Center Pivot Irrigation Machines

    • 675.21 General.
    • 675.22 Equivalent Current Ratings.
  72. Article 680
    Chapter 6 — Special Equipment

    Article 680 - Swimming Pools, Fountains, and Similar Installations

    • Part I. General
    • 680.1 Scope.
    • 680.2 Definitions.
    • 680.4 Approval of Equipment.
    • 680.5 Ground-Fault Circuit Interrupters.
    • 680.6 Grounding.
    • 680.7 Grounding and Bonding Terminals.
    • 680.8 Cord-and-Plug-Connected Equipment.
    • 680.9 Overhead Conductor Clearances.
    • 680.10 Electric Pool Water Heaters.
    • 680.11 Underground Wiring Location.
    • 680.12 Equipment Rooms and Pits.
    • 680.13 Maintenance Disconnecting Means.
    • 680.14 Corrosive Environment.
    • Part II. Permanently Installed Pools

    • 680.20 General.
    • 680.21 Motors.
    • 680.22 Lighting, Receptacles, and Equipment.
    • 680.23 Underwater Luminaires.
    • 680.24 Junction Boxes and Electrical Enclosures for Transformers or Ground-Fault Circuit Interrupters.
    • 680.25 Feeders.
    • 680.26 Equipotential Bonding.
    • 680.27 Specialized Pool Equipment.
    • 680.28 Gas-Fired Water Heater.
    • Part III. Storable Pools, Storable Spas, and Storable Hot Tubs

    • 680.30 General.
    • 680.31 Pumps.
    • 680.32 Ground-Fault Circuit Interrupters Required.
    • 680.33 Luminaires.
    • 680.34 Receptacle Locations.
    • Part IV. Spas and Hot Tubs

    • 680.40 General.
    • 680.41 Emergency Switch for Spas and Hot Tubs.
    • 680.42 Outdoor Installations.
    • 680.43 Indoor Installations.
    • 680.44 Protection.
    • Part V. Fountains

    • 680.50 General.
    • 680.51 Luminaires, Submersible Pumps, and Other Submersible Equipment.
    • 680.52 Junction Boxes and Other Enclosures.
    • 680.53 Bonding.
    • 680.54 Grounding.
    • 680.55 Methods of Grounding.
    • 680.56 Cord-and-Plug-Connected Equipment.
    • 680.57 Signs.
    • 680.58 GFCI Protection for Adjacent Receptacle Outlets.
    • Part VI. Pools and Tubs for Therapeutic Use

    • 680.60 General.
    • 680.61 Permanently Installed Therapeutic Pools.
    • 680.62 Therapeutic Tubs (Hydrotherapeutic Tanks).
    • Part VII. Hydromassage Bathtubs

    • 680.70 General.
    • 680.71 Protection.
    • 680.72 Other Electrical Equipment.
    • 680.73 Accessibility.
    • 680.74 Bonding.
    • Part VIII. Electrically Powered Pool Lifts

    • 680.80 General.
    • 680.81 Equipment Approval.
    • 680.82 Protection.
    • 680.83 Bonding.
    • 680.84 Switching Devices.
    • 680.85 Nameplate Marking.
  73. Article 685
    Chapter 6 — Special Equipment

    Article 685 - Integrated Electrical Systems

    Article 685, Integrated Electrical Systems, discusses some facilities with processes that could become a serious hazard if the process lost power. The hazard could endanger personnel or damage equipment. Examples include chemical processes, steel production and large electromagnets used for lifting scrap iron. In the case of the scrap iron, dropping it could seriously injure workers. Removal of power for chemical processes can create a hazard for personnel, including the potential for an explosion. Removal of power for melting steel can result in damage to processes and equipment.

    The purpose of the NEC is the protection of personnel and property from hazards arising from the use of electricity. The use of Article 685 is very limited. As noted in the scope, it can be used where “an orderly shutdown is required to minimize personnel hazard and equipment damage.”

    There is a requirement for qualified personnel to supervise and maintain the installation. The responsible person must have documented safety training on the hazards involved, which must be maintained in the office responsible for the installation. Finally, the safeguards used for the installation must be approved by the authority having jurisdiction. A circuit fault will usually be indicated by an alarm. This gives the trained personnel the opportunity to initiate an orderly shutdown. There is a table in 685.3 that refers to a number of sections in other parts of the Code that correlate the requirements for shutdown. The overcurrent protection rules in 240.12 and 240.13(1) govern installation where an orderly shutdown is essential.

    • Part I. General
    • 685.1 Scope.
    • 685.3 Application of Other Articles.
    • Part II. Orderly Shutdown

    • 685.10 Location of Overcurrent Devices in or on Premises.
    • 685.12 Direct-Current System Grounding.
    • 685.14 Ungrounded Control Circuits.
  74. Article 690
    Chapter 6 — Special Equipment

    Article 690 - Solar Photovoltaic (PV) Systems

    • Part I. General
    • 690.1 Scope.
    • 690.2 Definitions.
    • 690.4 General Requirements.
    • 690.6 Alternating-Current (ac) Modules.
    • Part II. Circuit Requirements

    • 690.7 Maximum Voltage.
    • 690.8 Circuit Sizing and Current.
    • 690.9 Overcurrent Protection.
    • 690.10 Stand-Alone Systems.
    • 690.11 Arc-Fault Circuit Protection (Direct Current).
    • 690.12 Rapid Shutdown of PV Systems on Buildings.
    • Part III. Disconnecting Means

    • 690.13 Building or Other Structure Supplied by a Photovoltaic SystemPhotovoltaic System Disconnecting Means.
    • 690.15 Disconnection of Photovoltaic Equipment.
    • Part IV. Wiring Methods

    • 690.31 Methods Permitted.
    • 690.32 Component Interconnections.
    • 690.33 Connectors.
    • 690.34 Access to Boxes.
    • Part V. Grounding and Bonding

    • 690.41 System Grounding.
    • 690.42 Point of System Grounding Connection.
    • 690.43 Equipment Grounding and Bonding.
    • 690.45 Size of Equipment Grounding Conductors.
    • 690.46 Array Equipment Grounding Conductors.
    • 690.47 Grounding Electrode System.
    • 690.50 Equipment Bonding Jumpers.
    • Part VI. Marking

    • 690.51 Modules.
    • 690.52 Alternating-Current Photovoltaic Modules.
    • 690.53 Direct-Current Photovoltaic Power Source.
    • 690.54 Interactive System Point of Interconnection.
    • 690.55 Photovoltaic Power Systems EmployingSystems Connected to Energy Storage Systems.
    • 690.56 Identification of Power Sources.
    • Part VII. Connection to Other Sources

    • 690.59 Connection to Other Sources.
    • Part VIII. Energy Storage Systems

    • 690.71 InstallationGeneral.
    • 690.72 Self-Regulated PV Charge Control.
  75. Article 694
    Chapter 6 — Special Equipment

    Article 694 - Wind Electric Systems

    • Part I. General
    • 694.1 Scope.
    • 694.2 Definitions.
    • 694.7 Installation.
    • Part II. Circuit Requirements

    • 694.10 Maximum Voltage.
    • 694.12 Circuit Sizing and Current.
    • 694.15 Overcurrent Protection.
    • Part III. Disconnecting Means

    • 694.20 All Conductors.
    • 694.22 Additional Provisions.
    • 694.23 Turbine Shutdown.
    • 694.24 Disconnection of Wind Electric System Equipment.
    • 694.26 Fuses.
    • 694.28 Installation and Service of a Wind Turbine.
    • Part IV. Wiring Methods

    • 694.30 Permitted Methods.
    • Part V. Grounding and Bonding

    • 694.40 Equipment Grounding and Bonding.
    • Part VI. Marking

    • 694.50 Interactive System Point of Interconnection.
    • 694.52 Power Systems Employing Energy Storage.
    • 694.54 Identification of Power Sources.
    • 694.56 Instructions for Disabling Turbine.
    • Part VII. Connection to Other Sources

    • 694.60 Identified Interactive Equipment.
    • 694.62 Installation.
    • 694.66 Operating Voltage Range.
    • 694.68 Point of Connection.
  76. Article 695
    Chapter 6 — Special Equipment

    Article 695 - Fire Pumps

    • 695.1 Scope.
    • 695.2 Definitions.
    • 695.3 Power Source(s) for Electric Motor-Driven Fire Pumps.
    • 695.4 Continuity of Power.
    • 695.5 Transformers.
    • 695.6 Power Wiring.
    • 695.7 Voltage Drop.
    • 695.10 Listed Equipment.
    • 695.12 Equipment Location.
    • 695.14 Control Wiring.
    • 695.15 Surge Protection.
  77. Article 720
    Chapter 7 — Special Conditions

    Article 720 - Circuits and Equipment Operating at Less Than 50 Volts

    There isn’t a lot in Article 720, Circuits and Equipment Operating at Less Than 50 Volts. Several articles have their own requirements for installations operating at less than 50V.

    • 720.1 Scope.
    • 720.2 Other Articles.
    • 720.3 Hazardous (Classified) Locations.
    • 720.4 Conductors.
    • 720.5 Lampholders.
    • 720.6 Receptacle Rating.
    • 720.7 Receptacles Required.
    • 720.9 Batteries.
    • 720.11 Mechanical Execution of Work.
  78. Article 725
    Chapter 7 — Special Conditions

    Article 725 - Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits

    Part I. General

    • 725.1 Scope.
    • 725.2 Definitions.
    • 725.3 Other Articles.
    • 725.21 Access to Electrical Equipment Behind Panels Designed to Allow Access.
    • 725.24 Mechanical Execution of Work.
    • 725.25 Abandoned Cables.
    • 725.30 Class 1, Class 2, and Class 3 Circuit Identification.
    • 725.31 Safety-Control Equipment.
    • 725.35 Class 1, Class 2, and Class 3 Circuit Requirements.

    • Part II. Class 1 Circuits
    • 725.41 Class 1 Circuit Classifications and Power Source Requirements.
    • 725.43 Class 1 Circuit Overcurrent Protection.
    • 725.45 Class 1 Circuit Overcurrent Device Location.
    • 725.46 Class 1 Circuit Wiring Methods.
    • 725.48 Conductors of Different Circuits in the Same Cable, Cable Tray, Enclosure, or Raceway.
    • 725.49 Class 1 Circuit Conductors.
    • 725.51 Number of Conductors in Cable Trays and Raceway, and Ampacity Adjustment.
    • 725.52 Circuits Extending Beyond One Building.

    • Part III. Class 2 and Class 3 Circuits
    • 725.121 Power Sources for Class 2 and Class 3 Circuits.
    • 725.124 Circuit Marking.
    • 725.127 Wiring Methods on Supply Side of the Class 2 or Class 3 Power Source.
    • 725.130 Wiring Methods and Materials on Load Side of the Class 2 or Class 3 Power Source.
    • 725.133 Installation of Conductors and Equipment in Cables, Compartments, Cable Trays, Enclosures, Manholes, Outlet Boxes, Device Boxes, Raceways, and Cable Routing Assemblies for Class 2 and Class 3 Circuits.
    • 725.135 Installation of Class 2, Class 3, and PLTC Cables.
    • 725.136 Separation from Electric Light, Power, Class 1, Non–Power-Limited Fire Alarm Circuit Conductors, and Medium-Power Network-Powered Broadband Communications Cables.
    • 725.139 Installation of Conductors of Different Circuits in the Same Cable, Enclosure, Cable Tray, Raceway, or Cable Routing Assembly.
    • 725.141 Installation of Circuit Conductors Extending Beyond One Building.
    • 725.143 Support of Conductors.
    • 725.144 Transmission of Power and Data.
    • 725.154 Applications of Listed Class 2, Class 3, and PLTC Cables.

    • Part IV. Listing Requirements
    • 725.170 Listing and Marking of Equipment for Power and Data Transmission.
    • 725.179 Listing and Marking of Class 2, Class 3, and Type PLTC Cables; Communications Raceways; and Cable Routing Assemblies.
  79. Article 760
    Chapter 7 — Special Conditions

    Article 760 - Fire Alarm Systems

    • Part I. General
    • 760.1 Scope.
    • 760.2 Definitions.
    • 760.3 Other Articles.
    • 760.21 Access to Electrical Equipment Behind Panels Designed to Allow Access.
    • 760.24 Mechanical Execution of Work.
    • 760.25 Abandoned Cables.
    • 760.30 Fire Alarm Circuit Identification.
    • 760.32 Fire Alarm Circuits Extending Beyond One Building.
    • 760.35 Fire Alarm Circuit Requirements.
    • Part II. Non–Power-Limited Fire Alarm (NPLFA) Circuits

    • 760.41 NPLFA Circuit Power Source Requirements.
    • 760.43 NPLFA Circuit Overcurrent Protection.
    • 760.45 NPLFA Circuit Overcurrent Device Location.
    • 760.46 NPLFA Circuit Wiring.
    • 760.48 Conductors of Different Circuits in Same Cable, Enclosure, or Raceway.
    • 760.49 NPLFA Circuit Conductors.
    • 760.51 Number of Conductors in Cable Trays and Raceways, and Ampacity Adjustment Factors.
    • 760.53 Multiconductor NPLFA Cables.
    • Part III. Power-Limited Fire Alarm (PLFA) Circuits

    • 760.121 Power Sources for PLFA Circuits.
    • 760.124 Circuit Marking.
    • 760.127 Wiring Methods on Supply Side of the PLFA Power Source.
    • 760.130 Wiring Methods and Materials on Load Side of the PLFA Power Source.
    • 760.133 Installation of Conductors and Equipment in Cables, Compartments, Cable Trays, Enclosures, Manholes, Outlet Boxes, Device Boxes, and RacewaysRaceways, and Cable Routing Assemblies for Power-Limited Fire Alarm Circuits.
    • 760.135 Installation of PLFA Cables in Buildings.
    • 760.136 Separation from Electric Light, Power, Class 1, NPLFA, and Medium-Power Network-Powered Broadband Communications Circuit Conductors.
    • 760.139 Installation of Conductors of Different PLFA Circuits, Class 2, Class 3, and Communications Circuits in the Same Cable, Enclosure, Cable Tray, Raceway, or Cable Routing Assembly.
    • 760.142 Conductor Size.
    • 760.143 Support of Conductors.
    • 760.145 Current-Carrying Continuous Line-Type Fire Detectors.
    • 760.154 Applications of Listed PLFA Cables.
    • Part IV. Listing Requirements

    • 760.176 Listing and Marking of NPLFA Cables.
    • 760.179 Listing and Marking of PLFA Cables and Insulated Continuous Line-Type Fire Detectors.
  80. Article 770
    Chapter 7 — Special Conditions

    Article 770 - Optical Fiber Cables

    • Part I. General
    • 770.1 Scope.
    • 770.2 Definitions.
    • 770.3 Other Articles.
    • 770.21 Access to Electrical Equipment Behind Panels Designed to Allow Access.
    • 770.24 Mechanical Execution of Work.
    • 770.25 Abandoned Cables.
    • 770.26 Spread of Fire or Products of Combustion.
    • Part II. Cables Outside and Entering Buildings

    • 770.44 Overhead (Aerial) Optical Fiber Cables.
    • 770.47 Underground Optical Fiber Cables Entering Buildings.
    • 770.48 Unlisted Cables and Raceways Entering Buildings.
    • 770.49 Metallic Entrance Conduit Grounding.
    • Part III. Protection

    • 770.93 Grounding or Interruption of Non–Current-Carrying Metallic Members of Optical Fiber Cables.
    • Part IV. Grounding Methods

    • 770.100 Entrance Cable Bonding and Grounding.
    • 770.106 Grounding and Bonding of Entrance Cables at Mobile Homes.
    • Part V. Installation Methods Within Buildings

    • 770.110 Raceways and Cable Routing Assemblies for Optical Fiber Cables.
    • 770.113 Installation of Optical Fiber Cables.
    • 770.114 Grounding.
    • 770.133 Installation of Optical Fibers and Electrical Conductors.
    • 770.154 Applications of Listed Optical Fiber Cables.
    • Part VI. Listing Requirements

    • 770.179 Optical Fiber Cables.
    • 770.180 Grounding Devices.
  81. Article 800
    Chapter 8 — Communications Systems

    Article 800 - Communications Circuits

    • Part I. General
    • 800.1 Scope.
    • 800.2 Definitions.
    • 800.3 Other Articles.
    • 800.18 Installation of Equipment.
    • 800.21 Access to Electrical Equipment Behind Panels Designed to Allow Access.
    • 800.24 Mechanical Execution of Work.
    • 800.25 Abandoned Cables.
    • 800.26 Spread of Fire or Products of Combustion.
    • Part II. Wires and Cables Outside and Entering Buildings

    • 800.44 Overhead (Aerial) Communications Wires and Cables.
    • 800.47 Underground Communications Wires and Cables Entering Buildings.
    • 800.48 Unlisted Cables Entering Buildings.
    • 800.49 Metallic Entrance Conduit Grounding.
    • 800.50 Circuits Requiring Primary Protectors.
    • 800.53 Lightning Conductors.
    • Part III. Protection

    • 800.90 Protective Devices.
    • 800.93 Grounding or Interruption of Non–Current-Carrying Metallic Sheath Members of Communications Cables.
    • Part IV. Grounding Methods

    • 800.100 Cable and Primary Protector Bonding and Grounding.
    • 800.106 Primary Protector Grounding and Bonding at Mobile Homes.
    • Part V. Installation Methods Within Buildings

    • 800.110 Raceways and Cable Routing Assemblies for Communications Wires and Cables.
    • 800.113 Installation of Communications Wires, Cables and Raceways, and Cable Routing Assemblies.
    • 800.133 Installation of Communications Wires, Cables, and Equipment.
    • 800.154 Applications of Listed Communications Wires, Cables, and Raceways, and Listed Cable Routing Assemblies.
    • 800.156 Dwelling Unit Communications Outlet.
    • Part VI. Listing Requirements

    • 800.170 Equipment.
    • 800.173 Drop Wire and Cable.
    • 800.179 Communications Wires and Cables.
    • 800.180 Grounding Devices.
    • 800.182 Communications Raceways and Cable Routing Assemblies and Communications Raceways.
  82. Article 810
    Chapter 8 — Communications Systems

    Article 810 - Radio and Television Equipment

    Article 810, Radio and Television Equipment, covers radio and television receiving equipment installations, amateur radio transmission and receiving equipment and citizens band (CB) radio equipment. Amateur radio is licensed by the Federal Communications Commission (FCC). CB radio no longer requires a license. Most people using either of these services are unaware that they are also covered by the NEC because such installations are never inspected by an AHJ. The FCC reserves the right to inspect an installation; however, it is not inspecting for Code compliance, but is primarily concerned with transmissions that interfere with other radio services.

    • Part I. General
    • 810.1 Scope.
    • 810.2 Definitions.
    • 810.3 Other Articles.
    • 810.4 Community Television Antenna.
    • 810.5 Radio Noise Suppressors.
    • 810.6 Antenna Lead-In Protectors.
    • 810.7 Grounding Devices.
    • Part II. Receiving Equipment — Antenna Systems

    • 810.11 Material.
    • 810.12 Supports.
    • 810.13 Avoidance of Contacts with Conductors of Other Systems.
    • 810.14 Splices.
    • 810.15 Grounding.
    • 810.16 Size of Wire-Strung Antenna — Receiving Station.
    • 810.17 Size of Lead-in — Receiving Station.
    • 810.18 Clearances — Receiving Stations.
    • 810.19 Electrical Supply Circuits Used in Lieu of Antenna — Receiving Stations.
    • 810.20 Antenna Discharge Units — Receiving Stations.
    • 810.21 Bonding Conductors and Grounding Electrode Conductors — Receiving Stations.
    • Part III. Amateur and Citizen Band Transmitting and Receiving Stations — Antenna Systems

    • 810.51 Other Sections.
    • 810.52 Size of Antenna.
    • 810.53 Size of Lead-in Conductors.
    • 810.54 Clearance on Building.
    • 810.55 Entrance to Building.
    • 810.56 Protection Against Accidental Contact.
    • 810.57 Antenna Discharge Units — Transmitting Stations.
    • 810.58 Bonding Conductors and Grounding Electrode Conductors — Amateur and Citizen Band Transmitting and Receiving Stations.
    • Part IV. Interior Installation — Transmitting Stations

    • 810.70 Clearance from Other Conductors.
    • 810.71 General.
Author
James777Samples
ID
365288
Card Set
2017 NEC articles June 2024
Description
2017 NEC articles June 2024
Updated

  1. Home
  2. Flashcards
  3. Preview