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eLibrary > NFPA 70: National Electrical Code (NEC) >

NFPA 70: National Electrical Code (NEC), 1999

NFPA Standards are copyright of National Fire Protection Association (NFPA). NFPA Standards are reproduced with NFPA's permission by MADCAD.com. NFPA and the NFPA logos are trademarks and service marks of NFPA. All rights reserved.

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NFPA 70: National Electrical Code (NEC), 1999

CONTENTS
NATIONAL ELECTRIC CODE COMMITTEE
NFPA 70 [Go to Page]
Article 90 - Introduction [Go to Page]
90-1.Purpose.
90-2.Scope.
90-3.Code Arrangement.
90-4.Enforcement.
90-5.Mandatory Rules, Permissive Rules, and ExplanaÃtory Material.
90-6.Formal Interpretations.
90-7.Examination of Equipment for Safety.
90-8.Wiring Planning.
90-9.Metric Units of Measurement.
CHAPTER 1 General [Go to Page]
Article 100 - Definitions [Go to Page]
A.General
B.Over 600 Volts, Nominal
Article 110 - Requirements for Electrical Installations [Go to Page]
A.General [Go to Page]
110-2.Approval.
110-3.Examination, Identification, Installation, and Use of Equipment.
110-4.Voltages.
110-5.Conductors.
110-6.Conductor Sizes.
110-7.Insulation Integrity.
110-8.Wiring Methods.
110-9.Interrupting Rating.
110-10.Circuit Impedance and Other Characteristics.Ã
110-11.Deteriorating Agents.
110-12.Mechanical Execution of Work.
110-13.Mounting and Cooling of Equipment.
110-14.Electrical Connections.
110-18.Arcing Parts.
110-19.Light and Power from Railway Conductors.
110-21.Marking.
110-22.Identification of Disconnecting Means.
B.600 Volts, Nominal, or Less [Go to Page]
110-26.Spaces About Electrical Equipment.
110-27.Guarding of Live Parts.
C.Over 600 Volts, Nominal [Go to Page]
110-30.General.
110-31.Enclosure for Electrical Installations.
110-32.Work Space About Equipment.
110-33.Entrance and Access to Work Space.
110-34.Work Space and Guarding.
110-36.Circuit Conductors.
110-40.Temperature Limitations at Terminations.
D.Tunnel Installations Over 600 Volts, Nominal [Go to Page]
110-51.General.
110-52.Overcurrent Protection.
110-53.Conductors.
110-54.Bonding and Equipment Grounding ConducÃtors.
110-56.Energized Parts.
110-57.Ventilation System Controls.
110-58.Disconnecting Means.
110-59.Enclosures.
CHAPTER 2 Wiring and Protection [Go to Page]
Article 200 - Use and Identification of Grounded Conductors [Go to Page]
200-1.Scope.
200-2.General.
200-3.Connection to Grounded System.
200-6.Means of Identifying Grounded Conductors.
200-7.Use of Insulation of a White or Natural Gray Color or with Three Continuou
200-9.Means of Identification of Terminals.
200-10.Identification of Terminals.
200-11.Polarity of Connections.
Article 210 - Branch Circuits [Go to Page]
A.General Provisions [Go to Page]
210-1.Scope.
210-2.Other Articles for Specific-Purpose Branch CirÃcuits.
210-3.Rating.
210-4.Multiwire Branch Circuits.
210-5.Identification for Branch Circuits.
210-6.Branch-Circuit Voltage Limitations.
210-7.Receptacles and Cord Connectors.
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.
B.Branch-Circuit Ratings [Go to Page]
210-19.Conductors - Minimum Ampacity and Size.
210-20.Overcurrent Protection.
210-21.Outlet Devices.
210-23.Permissible Loads.
210-24.Branch Circuit Requirements - Summary.
210-25.Common Area Branch Circuits.
C.Required Outlets [Go to Page]
210-50.General.
210-52.Dwelling Unit Receptacle Outlets.
210-60.Guest Rooms.
210-62.Show Windows.
210-63.Heating, Air-Conditioning, and Refrigeration Equipment Outlet.
210-70.Lighting Outlets Required.
Article 215 - Feeders [Go to Page]
215-1.Scope.
215-2.Minimum Rating and Size.
215-3.Overcurrent Protection.
215-4.Feeders with Common Neutral.
215-5.Diagrams of Feeders.
215-6.Feeder Conductor Grounding Means.
215-7.Ungrounded Conductors Tapped from Grounded Systems.
215-8.Means of Identifying Conductor with the Higher Voltage to Ground.
215-9.Ground-Fault Circuit-Interrupter Protection for Personnel.
215-10.Ground-Fault Protection of Equipment.
215-11.Circuits Derived from Autotransformers.
Article 220 - Branch-Circuit, Feeder, and Service Calculations [Go to Page]
A.General [Go to Page]
220-1.Scope.
220-2.Computations.
220-3.Computation of Branch Circuit Loads.
220-4.Maximum Loads.
B.Feeders and Services [Go to Page]
220-10.General.
220-11.General Lighting.
220-12.Show-Window and Track Lighting.
220-13.Receptacle Loads µ Nondwelling Units.
220-13.Receptacle Loads µ Nondwelling Units.
220-14.Motors.
220-15.Fixed Electric Space Heating.
220-16.Small Appliance and Laundry Loads µ DwellÍing Unit.
220-17.Appliance Load µ Dwelling Unit(s).
220-18.Electric Clothes Dryers µ Dwelling Unit(s).
220-19.Electric Ranges and Other Cooking Appli-Ïances µ Dwelling Unit(s).
220-20.Kitchen Equipment µ Other Than Dwelling Unit(s).
220-20.Kitchen Equipment µ Other Than Dwelling Unit(s).
220-21.Noncoincident Loads.
220-22.Feeder or Service Neutral Load.
C.Optional Calculations for Computing Feeder and Service Loads [Go to Page]
220-30.Optional Calculation µ Dwelling Unit.
220-31.Optional Calculation for Additional Loads in Existing Dwelling Unit.
220-32.Optional Calculation µ Multifamily Dwelling.
220-33.Optional Calculation µ Two Dwelling Units.Ï
220-34.Optional Method µ Schools.
220-35.Optional Calculations for Determining Existing Loads.
220-36.Optional Calculation µ New Restaurants.
D.Method for Computing Farm Loads [Go to Page]
220-40.Farm Loads µ Buildings and Other Loads.
220-41.Farm Loads µ Total.
Article 225 - Outside Branch Circuits and Feeders [Go to Page]
225-1.Scope.
225-2.Other Articles.
A.General [Go to Page]
225-3.Calculation of Load.
225-4.Conductor Covering.
225-5.Size of Conductors.
225-6.Conductor Size and Support.
225-7.Lighting Equipment Installed Outdoors.
225-9.Overcurrent Protection.
225-10.Wiring on Buildings.
225-11.Circuit Exits and Entrances.
225-12.Open-Conductor Supports.
225-14.Open-Conductor Spacings.
225-15.Supports Over Buildings.
225-16.Point of Attachment to Buildings.
225-17.Means of Attachment to Buildings.
225-18.Clearance from Ground.
225-19.Clearances from Buildings for Conductors of Not Over 600 Volts, Nominal.
225-20.Mechanical Protection of Conductors.
225-21.Multiconductor Cables on Exterior Surfaces of Buildings.
225-22.Raceways on Exterior Surfaces of Buildings.
225-24.Outdoor Lampholders.
225-25.Location of Outdoor Lamps.
225-26.Vegetation.
B.More than One Building or Other Structure [Go to Page]
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.Suitable for Service Equipment.
225-37.Identification.
225-38.Disconnect Construction.
225-39.Rating of Disconnect.
225-40.Access to Overcurrent Protective Devices.
C.Over 600 Volts [Go to Page]
225-50.Warning Signs.
225-51.Isolating Switches.
225-52.Location.
225-53.Type.
Article 230 - Services [Go to Page]
230-1.Scope.
A.General [Go to Page]
230-2.Number of Services.
230-3.One Building or Other Structure Not to Be Supplied Through Another.
230-6.Other Conductors Considered Outside the Building.
230-7.Other Conductors in Raceway or Cable.
230-8.Raceway Seal.
230-9.Clearance from Building Openings.
B.Overhead Service-Drop Conductors [Go to Page]
230-21.Overhead Supply.
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.
C.Underground Service-Lateral Conductors [Go to Page]
230-30.Insulation.
230-31.Size and Rating.
230-32.Protection Against Damage.
D.Service-Entrance Conductors [Go to Page]
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 600 Volts, Nominal, or Less.
230-46.Spliced Conductors.
230-49.Protection Against Physical Damage - Underground.
230-50.Protection of Open Conductors and Cables Against Damage - Above Ground.
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.
E.Service Equipment - General [Go to Page]
230-62.Service Equipment - Enclosed or Guarded.
230-66.Marking.
F.Service Equipment - Disconnecting Means [Go to Page]
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.
G.Service Equipment - Overcurrent Protection [Go to Page]
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.
H.Services Exceeding 600 Volts, Nominal [Go to Page]
230-200.General.
230-202.Service-Entrance Conductors.
230-203.Warning Signs.
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.Metal-Enclosed Switchgear.
230-212.Services Over 15,000 Volts.
Article 240 - Overcurrent Protection [Go to Page]
240-1.Scope.
A.General [Go to Page]
240-2.Protection of Equipment.
240-3.Protection of Conductors.
240-4.Protection of Flexible Cords and Fixture Wires.Ã
240-6.Standard Ampere Ratings.
240-8.Fuses or Circuit Breakers in Parallel.
240-9.Thermal Devices.
240-10.Supplementary Overcurrent Protection.
240-11.Definition of Current-Limiting Overcurrent Protective Device.
240-12.Electrical System Coordination.
240-13.Ground-Fault Protection of Equipment.Ã
B.Location [Go to Page]
240-20.Ungrounded Conductors.
240-21.Location in Circuit.
240-22.Grounded Conductor.
240-23.Change in Size of Grounded Conductor.
240-24.Location in or on Premises.
C.Enclosures [Go to Page]
240-30.General.
240-32.Damp or Wet Locations.
240-33.Vertical Position.
D.Disconnecting and Guarding [Go to Page]
240-40.Disconnecting Means for Fuses.
240-41.Arcing or Suddenly Moving Parts.
E.Plug Fuses, Fuseholders, and Adapters [Go to Page]
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.
F.Cartridge Fuses and Fuseholders [Go to Page]
240-60.General.
240-61.Classification.
G.Circuit Breakers [Go to Page]
240-80.Method of Operation.
240-81.Indicating.
240-82.Nontamperable.
240-83.Marking.
240-85.Applications.
240-86.Series Ratings.
H.Supervised Industrial Installations [Go to Page]
240-90.General.
240-91.Definition of Supervised Industrial InstallaÃtion.
240-92.Location in Circuit.
I.Overcurrent Protection Over 600 Volts, Nominal [Go to Page]
240-100.Feeders and Branch Circuits.
240-101.Additional Requirements for Feeders.
Article 250 - Grounding [Go to Page]
A.General [Go to Page]
250-1.Scope.
250-2.General Requirements for Grounding and BondÃing.
250-4.Application of Other Articles.
250-6.Objectionable Current Over Grounding ConÃductors.
250-8.Connection of Grounding and Bonding EquipÃment.
250-10.Protection of Ground Clamps and Fittings.Ã
250-12.Clean Surfaces.
B.Circuit and System Grounding [Go to Page]
250-20.Alternating-Current Circuits and Systems to Be Grounded.
250-21.Alternating-Current Systems of 50 Volts to 1000 Volts Not Required to Be
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.
250-30.Grounding Separately Derived Alternating-Current Systems.
250-32.Two or More Buildings or Structures Supplied from a Common Service.
250-34.Portable and Vehicle-Mounted Generators.
250-36.High-Impedence Grounded Neutral Systems.
C.Grounding Electrode System and Grounding Electrode Conductor [Go to Page]
250-50.Grounding Electrode System.
250-52.Made and Other Electrodes.
250-54.Supplementary Grounding Electrodes.
250-56.Resistance of Made Electrodes.
250-58.Common Grounding Electrode.
250-60.Use of Air Terminals.
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 Connection to Grounding Electrodes.
250-70.Methods of Grounding Conductor Connection to Electrodes.
D.Enclosure, Raceway, and Service Cable Grounding [Go to Page]
250-80.Service Raceways and Enclosures.
250-84.Underground Service Cable or Conduit.
250-86.Other Conductor Enclosures and Raceways.
E.Bonding [Go to Page]
250-90.General.
250-92.Services.
250-94.Method of Bonding at the Service.
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.Equipment Bonding Jumpers.
250-104.Bonding of Piping Systems and Exposed Structural Steel.
250-106.Lightning Protection Systems.
F.Equipment Grounding and Equipment Grounding Conductors [Go to Page]
250-110.Equipment Fastened in Place or Connected by Permanent Wiring Methods
250-112.Fastened in Place or Connected by Permanent Wiring Methods (Fixed) -
250-114.Equipment Connected by Cord and Plug.
250-116.Nonelectric Equipment.
250-118.Types of Equipment Grounding Conductors.
250-119.Identification of Equipment Grounding Conductors.
250-120.Equipment Grounding Conductor Installation.
250-122.Size of Equipment Grounding Conductors.
250-124.Equipment Grounding Conductor Continuity.
250-126.Identification of Wiring Device Terminals.
G.Methods of Equipment Grounding [Go to Page]
250-130.Equipment Grounding Conductor Connections.
250-132.Short Sections of Raceway.
250-134.Equipment Fastened in Place or Connected by Permanent Wiring Methods
250-136.Equipment Considered Effectively 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.
H.Direct-Current Systems [Go to Page]
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 Direct-Current Grounding Electrode Conductor.
250-168.Direct-Current Bonding Jumper.
250-169.Ungrounded Direct-Current Separately Derived Systems.
J.Instruments, Meters, and Relays [Go to Page]
250-170.Instrument Transformer Circuits.
250-172.Instrument Transformer Cases.
250-174.Cases of Instruments, Meters, and Relays OpÃerating at Less than 1000 Vo
250-176.Cases of Instruments, Meters, and Relays - Operating Voltage 1 kV and Ov
250-178.Instrument Grounding Conductor.
K.Grounding of Systems and Circuits of 1 kV and Over (High Voltage) [Go to Page]
250-180.General.
250-182.Derived Neutral Systems.
250-184.Solidly Grounded Neutral Systems.
250-186.Impedance Grounded Neutral Systems.
250-188.Grounding of Systems Supplying Portable or Mobile Equipment.
250-190.Grounding of Equipment.
Article 280 - Surge Arresters [Go to Page]
A.General [Go to Page]
280-1.Scope.
280-2.Definition.
280-3.Number Required.
280-4.Surge Arrester Selection.
B.Installation [Go to Page]
280-11.Location.
280-12.Routing of Surge Arrester Connections.
C.Connecting Surge Arresters [Go to Page]
280-21.Installed at Services of Less than 1000 Volts.
280-22.Installed on the Load Side Services of Less than 1000 Volts.
280-23.Circuits of 1 kV and Over - Surge-Arrester Conductors.
280-24.Circuits of 1 kV and Over µ Interconnections.
280-25.Grounding.
CHAPTER 3 Wiring Methods and Materials [Go to Page]
Article 300 - Wiring Methods [Go to Page]
A.General Requirements [Go to Page]
300-1.Scope.
300-2.Limitations.
300-3.Conductors.
300-4.Protection Against Physical Damage.
300-5.Underground Installations.
300-6.Protection Against Corrosion.
300-8.Installation of Conductors with Other SysÃtems.
300-8.Installation of Conductors with Other Systems.
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 Metal Enclosures or Metal Raceways.
300-21.Spread of Fire or Products of Combustion.
300-22.Wiring in Ducts, Plenums, and Other Air-Handling Spaces.
300-23.Panels Designed to Allow Access.
B.Requirements for Over 600 Volts, Nominal [Go to Page]
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.
300-39.Braid-Covered Insulated Conductors - Open Installation.
300-40.Insulation Shielding.
300-42.Moisture or Mechanical Protection for Metal-Sheathed Cables.
300-50.Underground Installations.
Article 305 - Temporary Wiring [Go to Page]
305-1.Scope.
305-2.All Wiring Installations.
305-3.Time Constraints.
305-4.General.
305-6.Ground-Fault Protection for Personnel.
305-7.Guarding.
Article 310 - Conductors for General Wiring [Go to Page]
310-1.Scope.
310-2.Conductors.
310-3.Stranded Conductors.
310-4.Conductors in Parallel.
310-5.Minimum Size of Conductors.
310-6.Shielding.
310-7.Direct Burial Conductors.
310-8.Locations.
310-9.Corrosive Conditions.
310-10.Temperature Limitation of Conductors.
310-11.Marking.
310-12.Conductor Identification.
310-13.Conductor Constructions and Applications.
310-14.Aluminum Conductor Material.
310-15.Ampacities for Conductors Rated 0Å‚2000 Volts.
310-60.Conductors Rated 2001 to 35,000 Volts.
Article 318 - Cable Trays [Go to Page]
318-1.Scope.
318-2.Definition.
318-3.Uses Permitted.
318-4.Uses Not Permitted.
318-5.Construction Specifications.
318-6.Installation.
318-7.Grounding.
318-8.Cable Installation.
318-9.Number of Multiconductor Cables, Rated 2000 Volts or Less, in Cable Trays.
318-10.Number of Single Conductor Cables, Rated 2000 Volts or Less, in Cable Tra
318-11.Ampacity of Cables, Rated 2000 Volts or Less, in Cable Trays.
318-12.Number of Type MV and Type MC Cables (2001 Volts or Over) in Cable Trays.
318-13.Ampacity of Type MV and Type MC Cables (2001 Volts or Over) in Cable Tray
Article 320 - Open Wiring on Insulators [Go to Page]
320-1.Definition.
320-2.Other Articles.
320-3.Uses Permitted.
320-5.Conductors.
320-6.Conductor Supports.
320-7.Mounting of Conductor Supports.
320-8.Tie Wires.
320-10.Flexible Nonmetallic Tubing.
320-11.Through Walls, Floors, Wood Cross Members, etc.
320-12.Clearance from Piping, Exposed Conductors, etc.
320-13.Entering Spaces Subject to Dampness, Wetness, or Corrosive Vapors.
320-14.Protection from Physical Damage.
320-15.Unfinished Attics and Roof Spaces.
320-16.Switches.
Article 321 - Messenger Supported Wiring [Go to Page]
321-1.Definition.
321-2.Other Articles.
321-3.Uses Permitted.
321-4.Uses Not Permitted.
321-5.Ampacity.
321-6.Messenger Support.
321-7.Grounding.
321-8.Conductor Splices and Taps.
Article 324 - Concealed Knob-and-Tube Wiring [Go to Page]
324-1.Definition.
324-2.Other Articles.
324-3.Uses Permitted.
324-4.Uses Not Permitted.
324-5.Conductors.
324-6.Conductor Supports.
324-7.Tie Wires.
324-8.Conductor Clearances.
324-9.Through Walls, Floors, Wood Cross Members, etc.
324-10.Clearance from Piping, Exposed Conductors, etc.
324-11.Unfinished Attics and Roof Spaces.
324-12.Splices.
324-13.Boxes.
324-14.Switches.
Article 325 - Integrated Gas Spacer Cable: Type IGS [Go to Page]
A.General [Go to Page]
325-1.Definition.
325-2.Other Articles.
325-3.Uses Permitted.
325-4.Uses Not Permitted.
B.Installation [Go to Page]
325-11.Bending Radius.
325-12.Bends.
325-13.Fittings.
325-14.Ampacity.
C.Construction Specifications [Go to Page]
325-20.Conductors.
325-21.Insulation.
325-22.Conduit.
325-24.Marking.
Article 326 - Medium Voltage Cable: Type MV [Go to Page]
326-1.Definition.
326-2.Other Articles.
326-3.Uses Permitted.
326-4.Uses Not Permitted.
326-5.Construction.
326-6.Ampacity.
326-7.Marking.
Article 328 - Flat Conductor Cable: Type FCC [Go to Page]
A.General [Go to Page]
328-1.Scope.
328-2.Definitions.
328-3.Other Articles.
328-4.Uses Permitted.
328-5.Uses Not Permitted.
328-6.Branch-Circuit Ratings.
B.Installation [Go to Page]
328-10.Coverings.
328-11.Cable Connections and Insulating Ends.
328-12.Shields.
328-13.Enclosure and Shield Connections.
328-14.Receptacles.
328-15.Connection to Other Systems.
328-16.Anchoring.
328-17.Crossings.
328-18.System Height.
328-19.FCC Systems Alterations.
328-20.Polarization of Connections.
C.Construction [Go to Page]
328-30.Type FCC Cable.
328-31.Markings.
328-32.Conductor Identification.
328-33.Corrosion Resistance.
328-34.Insulation.
328-35.Shields.
328-36.Receptacles and Housings.
328-37.Transition Assemblies.
Article 330 - Mineral-Insulated, Metal-Sheathed Cable: Type MI [Go to Page]
A.General [Go to Page]
330-1.Definition.
330-2.Other Articles.
330-3.Uses Permitted.
330-4.Uses Not Permitted.
B.Installation [Go to Page]
330-10.Wet Locations.
330-11.Through Joists, Studs, or Rafters.
330-12.Supports.
330-13.Bends.
330-14.Fittings.
330-15.Terminal Seals.
330-16.Single Conductors.
C.Construction Specifications [Go to Page]
330-20.Conductors.
330-21.Insulation.
330-22.Outer Sheath.
Article 331 - Electrical Nonmetallic Tubing [Go to Page]
A.General [Go to Page]
331-1.Definition.
331-2.Other Articles.
331-3.Uses Permitted.
331-4.Uses Not Permitted.
B.Installation [Go to Page]
331-5.Size.
331-6.Number of Conductors in Tubing.
331-7.Trimming.
331-8.Joints.
331-9.Bends - How Made.
331-10.Bends - Number in One Run.
331-11.Supports.
331-12.Boxes and Fittings.
331-13.Splices and Taps.
331-14.Bushings.
C.Construction Specifications [Go to Page]
331-15.General.
Article 333 - Armored Cable: Type AC [Go to Page]
A.General [Go to Page]
333-1.Definition.
333-2.Other Articles.
333-3.Uses Permitted.
333-4.Uses Not Permitted.
B.Installation [Go to Page]
333-7.Support.
333-8.Bending Radius.
333-9.Boxes and Fittings.
333-10.Through or Parallel to Framing Members.
333-11.Exposed Work.
333-12.In Accessible Attics.
C.Construction Specifications [Go to Page]
333-19.Construction.
333-20.Conductors.
333-21.Grounding.
333-22.Marking.
Article 334 - Metal-Clad Cable: Type MC [Go to Page]
A.General [Go to Page]
334-1.Definition.
334-2.Other Articles.
334-3.Uses Permitted.
334-4.Uses Not Permitted.
B.Installation [Go to Page]
334-10.Installation.
334-11.Bending Radius.
334-12.Fittings.
334-13.Ampacity.
C.Construction Specifications [Go to Page]
334-20.Conductors.
334-21.Insulation.
334-22.Metallic Sheath.
334-23.Grounding.
334-24.Marking.
Article 336 - Nonmetallic-Sheathed Cable: Types NM, NMC, and NMS [Go to Page]
336-1.Scope.
A.General [Go to Page]
336-2.Definition.
336-3.Other Articles.
336-4.Uses Permitted.
336-5.Uses Not Permitted.
B.Installation [Go to Page]
336-6.Exposed Work µ General.
336-9.Through or Parallel to Framing Members.
336-16.Bends.
336-18.Supports.
336-20.Boxes of Insulating Material.
336-21.Devices of Insulating Material.
336-25.Devices with Integral Enclosures.
336-26.Ampacity.
C.Construction Specifications [Go to Page]
336-30.General.
336-31.Marking.
Article 338 - Service-Entrance Cable: Types SE and USE [Go to Page]
338-1.Definition.
338-2.Uses Permitted as Service-Entrance Conductors.
338-3.Uses Permitted as Branch Circuits or Feeders.
338-4.Installation Methods for Branch Circuits and Feeders.
338-5.Marking.
338-6.Bends.
Article 339 - Underground Feeder and Branch-Circuit Cable: Type UF [Go to Page]
339-1.Description and Marking.
339-2.Other Articles.
339-3.Use.
339-4.Overcurrent Protection.
339-5.Ampacity.
Article 340 - Power and Control Tray Cable: Type TC [Go to Page]
340-1.Definition.
340-2.Other Articles.
340-3.Construction.
340-4.Use Permitted.
340-5.Uses Not Permitted.
340-6.Marking.
340-7.Ampacity.
340-8.Bends.
Article 342 - Nonmetallic Extensions [Go to Page]
342-1.Definition.
342-2.Other Articles.
342-3.Uses Permitted.
342-4.Uses Not Permitted.
342-5.Splices and Taps.
342-6.Fittings.
342-7.Installation.
342-8.Marking.
Article 343 - Nonmetallic Underground Conduit with Conductors [Go to Page]
A.General [Go to Page]
343-1.Description.
343-2.Other Articles.
343-3.Uses Permitted.
343-4.Uses Not Permitted.
B.Installation [Go to Page]
343-5.Size.
343-6.Trimming.
343-7.Joints.
343-8.Conductor Terminations.
343-9.Bushings.
343-10.Bends - How Made.
343-11.Bends - Number in One Run.
343-12.Splices and Taps.
C.Construction [Go to Page]
343-13.General.
343-14.Conductors and Cables.
343-15.Conductor Fill.
343-16.Marking.
Article 345 - Intermediate Metal Conduit [Go to Page]
A.General [Go to Page]
345-1.Definition.
345-2.Other Articles.
345-3.Uses Permitted.
B.Installation [Go to Page]
345-5.Wet Locations.
345-6.Size.
345-7.Number of Conductors in Conduit.
345-8.Reaming and Threading.
345-9.Couplings and Connectors.
345-10.Bends - How Made.
345-11.Bends - Number in One Run.
345-12.Securing and Supporting.
345-13.Boxes and Fittings.
345-14.Splices and Taps.
345-15.Bushings.
C.Construction Specifications [Go to Page]
345-16.General.
Article 346 - Rigid Metal Conduit [Go to Page]
A.General [Go to Page]
346-1.Definition.
346-2.Other Articles.
346-3.Uses Permitted.
346-5.Wet Locations.
346-5.Wet Locations.
346-6.Size.
346-7.Number of Conductors in Conduit.
346-8.Reaming and Threading.
346-9.Couplings and Connectors.
346-10.Bends - How Made.
346-11.Bends - Number in One Run.
346-12.Securing and Supporting.
346-13.Boxes and Fittings.
346-14.Splices and Taps.
346-15.Bushings.
C.Construction Specifications [Go to Page]
346-16.General.
Article 347 - Rigid Nonmetallic Conduit [Go to Page]
347-1.Description.
347-2.Uses Permitted.
347-3.Uses Not Permitted.
347-4.Other Articles.
A.Installations [Go to Page]
347-5.Trimming.
347-6.Joints.
347-8.Securing and Supporting.
347-9.Expansion Fittings.
347-10.Size.
347-11.Number of Conductors.
347-12.Bushings.
347-13.Bends - How Made.
347-14.Bends - Number in One Run.
347-15.Boxes and Fittings.
347-16.Splices and Taps.
B.Construction Specifications [Go to Page]
347-17.General.
Article 348 - Electrical Metallic Tubing [Go to Page]
A.General [Go to Page]
348-1.Definition.
348-2.Other Articles.
348-4.Uses Permitted.
348-5.Uses Not Permitted.
B.Installation [Go to Page]
348-6.Wet Locations.
348-7.Size.
348-8.Number of Conductors in Tubing.
348-9.Reaming and Threading.
348-10.Couplings and Connectors.
348-11.Bends - How Made.
348-12.Bends - Number in One Run.
348-13.Supports.
348-14.Boxes and Fittings.
348-15.Splices and Taps.
C.Construction Specifications [Go to Page]
348-16.General.
Article 349 - Flexible Metallic Tubing [Go to Page]
A.General [Go to Page]
349-1.Definition.
349-3.Other Articles.
349-4.Uses Permitted.
349-5.Uses Not Permitted.
B.Construction and Installation [Go to Page]
349-10.Size.
349-12.Number of Conductors.
349-16.Grounding.
349-17.Splices and Taps.
349-18.Fittings.
349-20.Bends.
Article 350 - Flexible Metal Conduit [Go to Page]
A.General [Go to Page]
350-1.Scope.
350-2.Definition.
350-3.Other Articles.
350-4.Uses Permitted.
350-5.Uses Not Permitted.
B.Installation [Go to Page]
350-10.Size.
350-12.Number of Conductors.
350-14.Grounding.
350-16.Bends.
350-18.Supports.
350-20.Fittings.
350-22.Trimming.
350-24.Splices and Taps.
Article 351 - Liquidtight Flexible Metal Conduit and Liquidtight Flexible Nonme [Go to Page]
351-1.Scope.
A.Liquidtight Flexible Metal Conduit [Go to Page]
351-2.Definition.
351-3.Other Articles.
351-4.Use.
351-5.Size.
351-6.Number of Conductors.
351-7.Fittings.
351-8.Supports.
351-9.Grounding.
351-10.Bends - Number in One Run.
351-11.Splices and Taps.
B.Liquidtight Flexible Nonmetallic Conduit [Go to Page]
351-22.Definition.
351-23.Use.
351-24.Size.
351-25.Number of Conductors.
351-26.Fittings.
351-27.Securing and Supporting.
351-28.Equipment Grounding.
351-29.Splices and Taps.
351-30.Bends - Number in One Run.
Article 352 - Surface Metal Raceways and Surface Nonmetallic Raceways [Go to Page]
A.Surface Metal Raceways [Go to Page]
352-1.Uses.
352-2.Other Articles.
352-3.Size of Conductors.
352-4.Number of Conductors in Raceways.
352-5.Extension Through Walls and Floors.
352-6.Combination Raceways.
352-7.Splices and Taps.
352-8.General.
352-9.Grounding.
B.Surface Nonmetallic Raceways [Go to Page]
352-21.Description.
352-22.Use.
352-23.Other Articles.
352-24.Size of Conductors.
352-25.Number of Conductors in Raceways.
352-26.Combination Raceways.
352-27.General.
352-28.Extension Through Walls and Floors.
352-29.Splices and Taps.
C.Strut-Type Channel Raceway [Go to Page]
352-40.Description.
352-41.Uses Permitted.
352-42.Uses Not Permitted.
352-43.Other Articles.
352-44.Size of Conductors.
352-45.Number of Conductors in Raceways.
352-46.Extensions Through Walls and Floors.
352-47.Support of Strut-Type Channel Raceways.
352-48.Splices and Taps.
352-49.General.
352-50.Grounding.
352-51.Marking.
Article 353 - Multioutlet Assembly [Go to Page]
353-1.Other Articles.
353-2.Use.
353-3.Metal Multioutlet Assembly Through Dry Partitions.
Article 354 - Underfloor Raceways [Go to Page]
354-1.Other Articles.
354-2.Use.
354-3.Covering.
354-4.Size of Conductors.
354-5.Maximum Number of Conductors in Raceway.
354-6.Splices and Taps.
354-7.Discontinued Outlets.
354-8.Laid in Straight Lines.
354-9.Markers at Ends.
354-10.Dead Ends.
354-13.Junction Boxes.
354-14.Inserts.
354-15.Connections to Cabinets and Wall Outlets.
Article 356 - Cellular Metal Floor Raceways [Go to Page]
356-1.Definitions.
356-2.Uses Not Permitted.
356-3.Other Articles.
A.Installation [Go to Page]
356-4.Size of Conductors.
356-6.Splices and Taps.
356-6.Splices and Taps.
356-7.Discontinued Outlets.
356-8.Markers.
356-9.Junction Boxes.
356-10.Inserts.
356-11.Connection to Cabinets and Extensions from Cells.
B.Construction Specifications [Go to Page]
356-12.General.
Article 358 - Cellular Concrete Floor Raceways [Go to Page]
358-1.Scope.
358-2.Definitions.
358-3.Other Articles.
358-4.Uses Not Permitted.
358-5.Header.
358-6.Connection to Cabinets and Other Enclosures
358-7.Junction Boxes.
358-8.Markers.
358-9.Inserts.
358-10.Size of Conductors.
358-11.Maximum Number of Conductors.
358-12.Splices and Taps.
358-13.Discontinued Outlets.
Article 362 - Metal Wireways and Nonmetallic Wireways [Go to Page]
A.Metal Wireways [Go to Page]
362-1.Definition.
362-2.Uses.
362-3.Other Articles.
362-4.Size of Conductors.
362-5.Number of Conductors.
362-6.Deflected Insulated Conductors.
362-7.Splices and Taps.
362-8.Supports.
362-9.Extension Through Walls.
362-10.Dead Ends.
362-11.Extensions from Wireways.
362-12.Marking.
362-13.Grounding.
B.Nonmetallic Wireways [Go to Page]
362-14.Definition.
362-15.Uses Permitted.
362-16.Uses Not Permitted.
362-17.Other Articles.
362-18.Size of Conductors.
362-19.Number of Conductors.
362-20.Deflected Insulated Conductors.
362-21.Splices and Taps.
362-22.Supports.
362-23.Expansion Fittings.
362-24.Extension Through Walls.
362-25.Dead Ends.
362-26.Extensions from Nonmetallic Wireways.
362-27.Marking.
Article 363 - Flat Cable Assemblies: Type FC [Go to Page]
363-1.Definition.
363-2.Other Articles.
363-3.Uses Permitted.
363-4.Uses Not Permitted.
363-5.Installation.
363-6.Number of Conductors.
363-7.Size of Conductors.
363-8.Conductor Insulation.
363-9.Splices.
363-10.Taps.
363-11.Dead Ends.
363-12.Fixture Hangers.
363-13.Fittings.
363-14.Extensions.
363-15.Supports.
363-16.Rating.
363-17.Marking.
363-18.Protective Covers.
363-19.Identification.
363-20.Terminal Block Identification.
Article 364 - Busways [Go to Page]
A.General Requirements [Go to Page]
364-1.Scope.
364-2.Definition.
364-3.Other Articles.
364-4.Use.
364-5.Support.
364-6.Through Walls and Floors.
364-7.Dead Ends.
364-8.Branches from Busways.
364-9.Overcurrent Protection.
364-10.Rating of Overcurrent Protection - Feeders.
364-11.Reduction in Ampacity Size of Busway.
364-12.Feeder or Branch Circuits.
364-13.Rating of Overcurrent Protection - Branch Circuits.
364-15.Marking.
B.Requirements for Over 600 Volts, Nominal [Go to Page]
364-21.Identification.
364-22.Grounding.
364-23.Adjacent and Supporting Structures.
364-24.Neutral.
364-25.Barriers and Seals.
364-26.Drain Facilities.
364-27.Ventilated Bus Enclosures.
364-28.Terminations and Connections.
364-29.Switches.
364-30.Wiring 600 Volts or Less, Nominal.
Article 365 - Cablebus [Go to Page]
365-1.Definition.
365-2.Use.
365-3.Conductors.
365-5.Overcurrent Protection.
365-6.Support and Extension Through Walls and Floors.
365-7.Fittings.
365-8.Conductor Terminations.
365-9.Grounding.
365-10.Marking.
Article 370 - Outlet, Device, Pull and Junction Boxes, Conduit Bodies and Fittin [Go to Page]
A.Scope and General [Go to Page]
370-1.Scope.
370-2.Round Boxes.
370-3.Nonmetallic Boxes.
370-4.Metal Boxes.
370-5.Short Radius Conduit Bodies.
B.Installation [Go to Page]
370-15.Damp, Wet, or Hazardous (Classified) Locations.
370-16.Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit B
370-17.Conductors Entering Boxes, Conduit Bodies, or Fittings.
370-18.Unused Openings.
370-19.Boxes Enclosing Flush Devices.
370-20.In Wall or Ceiling.
370-21.Repairing Plaster and Drywall or Plasterboard.
370-22.Exposed Surface Extensions.
370-23.Supports.
370-24.Depth of Outlet Boxes.
370-25.Covers and Canopies.
370-27.Outlet Boxes.
370-28.Pull and Junction Boxes.
370-29.Conduit Bodies, Junction, Pull, and Outlet Boxes to Be Accessible.
C.Construction Specifications [Go to Page]
370-40.Metal Boxes, Conduit Bodies, and Fittings.
370-41.Covers.
370-42.Bushings.
370-43.Nonmetallic Boxes.
370-44.Marking.
D.Manholes and Other Electric Enclosures Intended for Personnel Entry [Go to Page]
370-50.General.
370-51.Strength.
370-52.Cabling Work Space.
370-53.Equipment Work Space.
370-54.Bending Space for Conductors.
370-55.Access to Manholes.
370-56.Access to Vaults and Tunnels.
370-57.Ventilation.
370-58.Guarding.
370-59.Fixed Ladders.
E.Pull and Junction Boxes for Use on Systems Over 600 Volts, Nominal [Go to Page]
370-70.General.
370-71.Size of Pull and Junction Boxes.
370-72.Construction and Installation Requirements.
Article 373 - Cabinets, Cutout Boxes, and Meter Socket Enclosures [Go to Page]
373-1.Scope.
A.Installation [Go to Page]
373-2.Damp, Wet, or Hazardous (Classified) ÃˆLocaÃtions.
373-3.Position in Wall.
373-4.Unused Openings.
373-5.Cabinets, Cutout Boxes, and Meter Socket En-Ãclosures.
373-6.Deflection of Conductors.
373-7.Space in Enclosures.
373-8.Enclosures for Switches or Overcurrent Devices.
373-9.Side or Back Wiring Spaces or Gutters.
B.Construction Specifications [Go to Page]
373-10.Material.
373-11.Spacing.
Article 374 - Auxiliary Gutters [Go to Page]
374-1.Use.
374-2.Extension Beyond Equipment.
374-3.Supports.
374-4.Covers.
374-5.Number of Conductors.
374-6.Ampacity of Conductors.
374-7.Clearance of Bare Live Parts.
374-8.Splices and Taps.
374-9.Construction and Installation.
Article 380 - Switches [Go to Page]
A.Installation [Go to Page]
380-1.Scope.
380-2.Switch Connections.
380-3.Enclosure.
380-4.Wet Locations.
380-5.Time Switches, Flashers, and Similar Devices.
380-6.Position and Connection of Switches.
380-7.Indicating.
380-8.Accessibility and Grouping.
380-9.Provisions for Snap Switch Faceplates.
380-10.Mounting of Snap Switches.
380-11.Circuit Breakers as Switches.
380-12.Grounding of Enclosures.
380-13.Knife Switches.
380-14.Rating and Use of Snap Switches.
B.Construction Specifications [Go to Page]
380-15.Marking.
380-16.600-Volt Knife Switches.
380-17.Fused Switches.
380-18.Wire-Bending Space.
Article 384 - Switchboards and Panelboards [Go to Page]
A.General [Go to Page]
384-1.Scope.
384-2.Other Articles.
384-3.Support and Arrangement of Busbars and Conductors.
384-4.Installation.
B.Switchboards [Go to Page]
384-5.Location of Switchboards.
384-6.Switchboards in Damp or Wet Locations.
384-7.Location Relative to Easily Ignitible Material.
384-8.Clearances.
384-9.Conductor Insulation.
384-10.Clearance for Conductors Entering Bus Enclosures.
384-12.Grounding of Instruments, Relays, Meters, and Instrument Transformers on
C.Panelboards [Go to Page]
384-13.General.
384-14.Classification of Panelboards.
384-15.Number of Overcurrent Devices on One Panelboard.
384-16.Overcurrent Protection.
384-17.Panelboards in Damp or Wet Locations.
384-18.Enclosure.
384-19.Relative Arrangement of Switches and Fuses.
384-20.Grounding of Panelboards.
D.Construction Specifications [Go to Page]
384-30.Panels.
384-31.Busbars.
384-32.Protection of Instrument Circuits.
384-33.Component Parts.
384-34.Knife Switches.
384-35.Wire-Bending Space in Panelboards.
384-36.Minimum Spacings.
CHAPTER 4 Equipment for General Use [Go to Page]
Article 400 - Flexible Cords and Cables [Go to Page]
A.General [Go to Page]
400-1.Scope.
400-2.Other Articles.
400-3.Suitability.
400-4.Types.
400-5.Ampacities for Flexible Cords and Cables.
400-6.Markings.
400-7.Uses Permitted.
400-8.Uses Not Permitted.
400-9.Splices.
400-10.Pull at Joints and Terminals.
400-11.In Show Windows and Show Cases.
400-12.Minimum Size.
400-13.Overcurrent Protection.
400-14.Protection from Damage.
B.Construction Specifications [Go to Page]
400-20.Labels.
400-21.Nominal Insulation Thickness.
400-22.Grounded-Conductor Identification.
400-23.Equipment Grounding Conductor Identification.
400-24.Attachment Plugs.
C.Portable Cables Over 600 Volts, Nominal [Go to Page]
400-30.Scope.
400-31.Construction.
400-32.Shielding.
400-33.Grounding.
400-34.Minimum Bending Radii.
400-35.Fittings.
400-36.Splices and Terminations.
Article 402 - Fixture Wires [Go to Page]
402-1.Scope.
402-2.Other Articles.
402-3.Types.
402-5.Allowable Ampacities for Fixture Wires.
402-6.Minimum Size.
402-7.Number of Conductors in Conduit or Tubing.
402-8.Grounded Conductor Identification.
402-9.Marking.
402-10.Uses Permitted.
402-11.Uses Not Permitted.
402-12.Overcurrent Protection.
Article 410 - Lighting Fixtures, Lampholders, Lamps, and Receptacles [Go to Page]
A.General [Go to Page]
410-1.Scope.
410-2.Application of Other Articles.
410-3.Live Parts.
B.Fixture Locations [Go to Page]
410-4.Fixtures in Specific Locations.
410-5.Fixtures Near Combustible Material.
410-6.Fixtures Over Combustible Material.
410-7.Fixtures in Show Windows.
410-8.Fixtures in Clothes Closets.
410-9.Space for Cove Lighting.
C.Provisions at Fixture Outlet Boxes, Canopies, and Pans [Go to Page]
410-10.Space for Conductors.
410-11.Temperature Limit of Conductors in Outlet Boxes.
410-12.Outlet Boxes to Be Covered.
410-13.Covering of Combustible Material at Outlet Boxes.
410-14.Connection of Electric-Discharge Lighting Fixtures.
D.Fixture Supports [Go to Page]
410-15.Supports.
410-16.Means of Support.
E.Grounding [Go to Page]
410-17.General.
410-18.Exposed Fixture Parts.
410-20.Equipment Grounding Conductor Attachment.
410-21.Methods of Grounding.
F.Wiring of Fixtures [Go to Page]
410-22.Fixture Wiring - General.
410-23.Polarization of Fixtures.
410-24.Conductor Insulation.
410-27.Pendant Conductors for Incandescent Filament Lamps.
410-28.Protection of Conductors and Insulation.
410-29.Cord-Connected Showcases.
410-30.Cord-Connected Lampholders and Fixtures.
410-31.Fixtures as Raceways.
G.Construction of Fixtures [Go to Page]
410-34.Combustible Shades and Enclosures.
410-35.Fixture Rating.
410-36.Design and Material.
410-37.Nonmetallic Fixtures.
410-38.Mechanical Strength.
410-39.Wiring Space.
410-42.Portable Lamps.
410-44.Cord Bushings.
410-45.Tests.
410-46.Live Parts.
H.Installation of Lampholders [Go to Page]
410-47.Screw-Shell Type.
410-48.Double-Pole Switched Lampholders.
410-49.Lampholders in Wet or Damp Locations.
J.Construction of Lampholders [Go to Page]
410-50.Insulation.
410-52.Switched Lampholders.
K.Lamps and Auxiliary Equipment [Go to Page]
410-53.Bases, Incandescent Lamps.
410-54.Electric-Discharge Lamp Auxiliary ÃˆEquipÃment.
L.Receptacles, Cord Connectors, and Attachment Plugs (Caps) [Go to Page]
410-56.Rating and Type.
410-57.Receptacles in Damp or Wet Locations.
410-58.Grounding-Type Receptacles, Adapters, Cord Connectors, and Attachment Plu
M.Special Provisions for Flush and Recessed Fixtures [Go to Page]
410-64.General.
410-65.Temperature.
410-66.Clearance and Installation.
410-67.Wiring.
N.Construction of Flush and Recessed Fixtures [Go to Page]
410-68.Temperature.
410-70.Lamp Wattage Marking.
410-71.Solder Prohibited.
410-72.Lampholders.
P.Special Provisions for Electric-Discharge Lighting Systems of 1000 Volts or Le [Go to Page]
410-73.General.
410-74.Direct-Current Equipment.
410-75.Open-Circuit Voltage Exceeding 300 Volts.Ã
410-76.Fixture Mounting.
410-77.Equipment Not Integral with Fixture.
410-78.Autotransformers.
410-79.Switches.
Q.Special Provisions for Electric-Discharge Lighting Systems of More than 1000 V [Go to Page]
410-80.General.
410-81.Control.
410-82.Lamp Terminals and Lampholders.
410-83.Transformer Ratings.
410-84.Transformer Type.
410-85.Transformers and Secondary Connections.
410-86.Transformer Locations.
410-87.Transformer Loading.
410-88.Wiring Method - Secondary Conductors.
410-89.Lamp Supports.
410-90.Exposure to Damage.
410-91.Marking.
410-92.Switches.
R.Lighting Track [Go to Page]
410-100.Definition.
410-101.Installation.
410-103.Heavy-Duty Lighting Track.
410-104.Fastening.
410-105.Construction Requirements.
Article 411 - Lighting Systems Operating at 30 Volts or Less [Go to Page]
411-1.Scope.
411-2.Lighting Systems Operating at 30 Volts or Less.
411-3.Listing Required.
411-4.Locations Not Permitted.
411-5.Secondary Circuits.
411-6.Branch Circuit.
411-7.Hazardous (Classified) Locations.
Article 422 - Appliances [Go to Page]
A.General [Go to Page]
422-1.Scope.
422-3.Other Articles.
422-4.Live Parts.
B.Installation [Go to Page]
422-10.Branch-Circuit Rating.
422-11.Overcurrent Protection.
422-12.Central Heating Equipment.
422-13.Storage-Type Water Heaters.
422-14.Infrared Lamp Industrial Heating Appliances.
422-15.Central Vacuum Outlet Assemblies.
422-16.Flexible Cords.
422-17.Protection of Combustible Material.
422-18.Support of Ceiling-Suspended (Paddle) Fans.
422-20.Other Installation Methods.
C.Disconnecting Means [Go to Page]
422-30.General.
422-31.Disconnection of Permanently Connected Appliances.
422-32.Disconnection of Cord- and Plug-Connected Appliances.
422-33.Unit Switch(es) as Disconnecting Means.
422-34.Switch and Circuit Breaker to Be Indicating.
422-35.Disconnecting Means for Motor-Driven Appliance.
D.Construction [Go to Page]
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.Stands for 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.
422-49.High-Pressure Spray Washers.
422-50.Cord- and Plug-Connected Pipe Heating Assemblies.
E.Marking [Go to Page]
422-60.Nameplate.
422-61.Marking of Heating Elements.
422-62.Appliances Consisting of Motors and Other Loads.
Article 424 - Fixed Electric Space-Heating Equipment [Go to Page]
A.General [Go to Page]
424-1.Scope.
424-2.Other Articles.
424-3.Branch Circuits.
B.Installation [Go to Page]
424-9.General.
424-10.Special Permission.
424-11.Supply Conductors.
424-12.Locations.
424-13.Spacing from Combustible Materials.
C.Control and Protection of Fixed Electric Space-Heating Equipment [Go to Page]
424-19.Disconnecting Means.
424-20.Thermostatically Controlled Switching Devices.
424-21.Switch and Circuit Breaker to Be IndicatÃing.
424-22.Overcurrent Protection.
D.Marking of Heating Equipment [Go to Page]
424-28.Nameplate.
424-29.Marking of Heating Elements.
E.Electric Space-Heating Cables [Go to Page]
424-34.Heating Cable Construction.
424-35.Marking of Heating Cables.
424-36.Clearances of Wiring in Ceilings.
424-37.Location of Branch-Circuit and Feeder Wiring in Exterior Walls.
424-38.Area Restrictions.
424-39.Clearance from Other Objects and Openings.
424-40.Splices.
424-41.Installation of Heating Cables on Dry Board, in Plaster, and on Concrete
424-42.Finished Ceilings.
424-43.Installation of Nonheating Leads of Cables.
424-44.Installation of Cables in Concrete or Poured Masonry Floors.
424-45.Inspection and Tests.
F.Duct Heaters [Go to Page]
424-57.General.
424-58.Identification.
424-59.Airflow.
424-60.Elevated Inlet Temperature.
424-61.Installation of Duct Heaters with Heat Pumps and Air Conditioners.
424-62.Condensation.
424-63.Fan Circuit Interlock.
424-64.Limit Controls.
424-65.Location of Disconnecting Means.
424-66.Installation.
G.Resistance-Type Boilers [Go to Page]
424-70.Scope.
424-71.Identification.
424-72.Overcurrent Protection.
424-73.Over-Temperature Limit Control.
424-74.Over-Pressure Limit Control.
H.Electrode-Type Boilers [Go to Page]
424-80.Scope.
424-81.Identification.
424-82.Branch-Circuit Requirements.
424-83.Over-Temperature Limit Control.
424-84.Over-Pressure Limit Control.
424-85.Grounding.
424-86.Markings.
J.Electric Radiant Heating Panels and Heating Panel Sets [Go to Page]
424-90.Scope.
424-91.Definitions.
424-92.Markings.
424-93.Installation.
424-94.Clearances of Wiring in Ceilings.
424-95.Location of Branch-Circuit and Feeder Wiring in Walls.
424-96.Connection to Branch-Circuit Conductors.
424-97.Nonheating Leads.
424-98.Installation in Concrete or Poured Masonry.
424-99.Installation Under Floor Covering.
Article 426 - Fixed Outdoor Electric Deicing and Snow-Melting Equipment [Go to Page]
A.General [Go to Page]
426-1.Scope.
426-2.Definitions.
426-3.Application of Other Articles.
426-4.Branch-Circuit Sizing.
B.Installation [Go to Page]
426-10.General.
426-11.Use.
426-12.Thermal Protection.
426-13.Identification.
426-14.Special Permission.
C.Resistance Heating Elements [Go to Page]
426-20.Embedded Deicing and Snow-Melting Equipment.
426-21.Exposed Deicing and Snow-Melting Equipment.
426-22.Installation of Nonheating Leads for Embedded Equipment.
426-23.Installation of Nonheating Leads for Exposed Equipment.
426-24.Electrical Connection.
426-25.Marking.
426-26.Corrosion Protection.
426-27.Grounding Braid or Sheath.
426-28.Equipment Protection.
D.Impedance Heating [Go to Page]
426-30.Personnel Protection.
426-31.Isolation Transformer.
426-32.Voltage Limitations.
426-33.Induced Currents.
426-34.Grounding.
E.Skin-Effect Heating [Go to Page]
426-40.Conductor Ampacity.
426-41.Pull Boxes.
426-42.Single Conductor in Enclosure.
426-43.Corrosion Protection.
426-44.Grounding.
F.Control and Protection [Go to Page]
426-50.Disconnecting Means.
426-51.Controllers.
426-52.Overcurrent Protection.
426-54.Cord- and Plug-Connected Deicing and Snow-Melting Equipment.
Article 427 - Fixed Electric Heating Equipment for Pipelines and Vessels [Go to Page]
A.General [Go to Page]
427-1.Scope.
427-2.Definitions.
427-3.Application of Other Articles.
427-4.Branch-Circuit Sizing.
B.Installation [Go to Page]
427-10.General.
427-11.Use.
427-12.Thermal Protection.
427-13.Identification.
C.Resistance Heating Elements [Go to Page]
427-14.Secured.
427-15.Not in Direct Contact.
427-16.Expansion and Contraction.
427-17.Flexural Capability.
427-18.Power Supply Leads.
427-19.Electrical Connections.
427-20.Marking.
427-22.Equipment Protection.
427-23.Metal Covering.
D.Impedance Heating [Go to Page]
427-25.Personnel Protection.
427-26.Isolation Transformer.
427-27.Voltage Limitations.
427-28.Induced Currents.
427-29.Grounding.
427-30.Secondary Conductor Sizing.
E.Induction Heating [Go to Page]
427-35.Scope.
427-36.Personnel Protection.
427-37.Induced Current.
F.Skin-Effect Heating [Go to Page]
427-45.Conductor Ampacity.
427-46.Pull Boxes.
427-47.Single Conductor in Enclosure.
427-48.Grounding.
G.Control and Protection [Go to Page]
427-55.Disconnecting Means.
427-56.Controls.
427-57.Overcurrent Protection.
Article 430 - Motors, Motor Circuits, and Controllers [Go to Page]
A.General [Go to Page]
430-1.Scope.
430-2.Adjustable-Speed Drive Systems.
430-3.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.
B.Motor Circuit Conductors [Go to Page]
430-21.General.
430-22.Single Motor.
430-23.Wound-Rotor Secondary.
430-24.Several Motors or a Motor(s) and Other Load(s).Ã
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.
C.Motor and Branch-Circuit Overload Protection [Go to Page]
430-31.General.
430-32.Continuous-Duty Motors.
430-33.Intermittent and Similar Duty.
430-34.Selection of Overload Relay.
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.
D.Motor Branch-Circuit Short-Circuit and Ground-Fault Protection [Go to Page]
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 Combiniation-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.
E.Motor Feeder Short-Circuit and Ground-Fault Protection [Go to Page]
430-61.General.
430-62.Rating or Setting - Motor Load.
430-63.Rating or Setting - Power and Light Loads.
F.Motor Control Circuits [Go to Page]
430-71.General.
430-72.Overcurrent Protection.
430-73.Mechanical Protection of Conductor.
430-74.Disconnection.
G.Motor Controllers [Go to Page]
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.
430-91.Motor Controller Enclosure Types.
H.Motor Control Centers [Go to Page]
430-92.General.
430-94.Overcurrent Protection.
430-95.Service-Entrance Equipment.
430-96.Grounding.
430-97.Busbars and Conductors.
430-98.Marking.
J.Disconnecting Means [Go to Page]
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 Switch.
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.
K.Over 600 Volts, Nominal [Go to Page]
430-121.General.
430-122.Marking on Controllers.
430-123.Conductor Enclosures Adjacent to Motors.
430-124.Size of Conductors.
430-125.Motor-Circuit Overcurrent Protection.
430-126.Rating of Motor Control Apparatus.
430-127.Disconnecting Means.
L.Protection of Live Parts - All Voltages [Go to Page]
430-131.General.
430-132.Where Required.
430-133.Guards for Attendants.
M.Grounding - All Voltages [Go to Page]
430-141.General.
430-142.Stationary Motors.
430-143.Portable Motors.
430-144.Controllers.
430-145.Method of Grounding.
N.Tables
Article 440 - Air-Conditioning and RefrigeratÃing Equipment [Go to Page]
A.General [Go to Page]
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.
B.Disconnecting Means [Go to Page]
440-11.General.
440-12.Rating and Interrupting Capacity.
440-13.Cord-Connected Equipment.
440-14.Location.
C.Branch-Circuit Short-Circuit and Ground-Fault Protection [Go to Page]
440-21.General.
440-22.Application and Selection.
D.Branch-Circuit Conductors [Go to Page]
440-31.General.
440-32.Single Motor-Compressor.
440-33.Motor-Compressor(s) With or Without AddiÃtional Motor Loads.
440-34.Combination Load.
440-35.Multimotor and Combination-Load Equipment.
E.Controllers for Motor-Compressors [Go to Page]
440-41.Rating.
F.Motor-Compressor and Branch-Circuit Overload Protection [Go to Page]
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
440-55.Cord- and Attachment Plug-Connected Motor-Compressors and Equipment on 15-
G.Provisions for Room Air Conditioners [Go to Page]
440-60.General.
440-61.Grounding.
440-62.Branch-Circuit Requirements.
440-63.Disconnecting Means.
440-64.Supply Cords.
Article 445 - Generators [Go to Page]
445-1.General.
445-2.Location.
445-3.Marking.
445-4.Overcurrent Protection.
445-5.Ampacity of Conductors.
445-6.Protection of Live Parts.
445-7.Guards for Attendants.
445-8.Bushings.
445-9.Generator Terminal Housings.
445-10.Disconnecting Means Required for Generators.
Article 450 - Transformers and Transformer Vaults (Including Secondary Ties) [Go to Page]
450-1.Scope.
A.General Provisions [Go to Page]
450-2.Definitions.
450-3.Overcurrent Protection.
450-4.Autotransformers 600 Volts, Nominal, or Less.
450-5.Grounding Autotransformers.
450-6.Secondary Ties.
450-7.Parallel Operation.
450-8.Guarding.
450-9.Ventilation.
450-10.Grounding.
450-11.Marking.
450-12.Terminal Wiring Space.
450-13.Accessibility.
B.Specific Provisions Applicable to Different Types of Transformers [Go to Page]
450-21.Dry-Type Transformers Installed Indoors.
450-22.Dry-Type Transformers Installed Outdoors.
450-23.Less-Flammable Liquid-Insulated Transformers.
450-24.Nonflammable Fluid-Insulated Transformers.
450-25.Askarel-Insulated Transformers Installed Indoors.
450-26.Oil-Insulated Transformers Installed Indoors.
450-27.Oil-Insulated Transformers Installed Outdoors.
450-28.Modification of Transformers.
C.Transformer Vaults [Go to Page]
450-41.Location.
450-42.Walls, Roofs, and Floors.
450-43.Doorways.
450-45.Ventilation Openings.
450-46.Drainage.
450-47.Water Pipes and Accessories.
450-48.Storage in Vaults.
Article 455 - Phase Converters [Go to Page]
A.General [Go to Page]
455-1.Scope.
455-2.Definitions.
455-3.Other Articles.
455-4.Marking.
455-5.Equipment Grounding Connection.
455-6.Conductors.
455-7.Overcurrent Protection.
455-8.Disconnecting Means.
455-9.Connection of Single-Phase Loads.
455-10.Terminal Housings.
B.Specific Provisions Applicable to Different Types of Phase Converters [Go to Page]
455-20.Disconnecting Means.
455-21.Start-Up.
455-22.Power Interruption.
455-23.Capacitors.
Article 460 - Capacitors [Go to Page]
460-1.Scope.
460-2.Enclosing and Guarding.
A.600 Volts, Nominal, and Under [Go to Page]
460-6.Discharge of Stored Energy.
460-8.Conductors.
460-9.Rating or Setting of Motor Overload Device.
460-10.Grounding.
460-12.Marking.
B.Over 600 Volts, Nominal [Go to Page]
460-24.Switching.
460-25.Overcurrent Protection.
460-26.Identification.
460-27.Grounding.
460-28.Means for Discharge.
Article 470 - Resistors and Reactors (For Rheostats, See Section 430-82.) [Go to Page]
A.600 Volts, Nominal, and Under [Go to Page]
470-1.Scope.
470-2.Location.
470-3.Space Separation.
470-4.Conductor Insulation.
B.Over 600 Volts, Nominal [Go to Page]
470-18.General.
470-19.Grounding.
470-20.Oil-Filled Reactors.
Article 480 - Storage Batteries [Go to Page]
480-1.Scope.
480-2.Definitions.
480-3.Wiring and Equipment Supplied from Batteries.
480-4.Grounding.
480-5.Insulation of Batteries Not Over 250 Volts.
480-6.Insulation of Batteries of Over 250 Volts.
480-7.Racks and Trays.
480-8.Battery Locations.
480-9.Vents.
Article 490 - Equipment, Over 600 Volts, Nominal [Go to Page]
A.General [Go to Page]
490-1.Scope.
490-2.Definition.
490-3.Oil-Filled Equipment.
B.Equipment - Specific Provisions [Go to Page]
490-21.Circuit-Interrupting Devices.
490-22.Isolating Means.
490-23.Voltage Regulators.
490-24.Minimum Space Separation.
C.Equipment - Metal-Enclosed Power Switchgear and Industrial Control Assemblies [Go to Page]
490-30.General.
490-31.Arrangement of Devices in Assemblies.
490-32.Guarding of High-Voltage Energized Parts Within a Compartment.
490-33.Guarding of Low Voltage Energized Parts With-in a Compartment.
490-34.Clearance for Cable Conductors Entering Enclosure.
490-35.Accessibility of Energized Parts.
490-36.Grounding.
490-37.Grounding of Devices.
490-38.Door Stops and Cover Plates.
490-39.Gas Discharge from Interrupting Devices.
490-40.Inspection Windows.
490-41.Location of Devices.
490-42.Interlocks - Interrupter Switches.
490-43.Stored Energy for Opening.
490-44.Fused Interrupter Switches.
490-45.Interlocks - Circuit Breakers.
D.Mobile and Portable Equipment [Go to Page]
490-51.General.
490-52.Overcurrent Protection.
490-53.Enclosures.
490-54.Collector Rings.
490-55.Power Cable Connections to Mobile Machines.
490-56.High-Voltage Portable Cable for Main Power Supply.
E.Electrode-Type Boilers [Go to Page]
490-70.General.
490-71.Electric Supply System.
490-72.Branch-Circuit Requirements.
490-73.Pressure and Temperature Limit Control.
490-74.Grounding.
CHAPTER 5 Special Occupancies [Go to Page]
Article 500 - Hazardous (Classified) Locations, Classes I, II, and III, Divisions 1 and 2 [Go to Page]
500-1.Scope - Articles 500 through 504.
500-2.Other Articles.
500-3.General.
500-4.Protection Techniques.
500-5.Special Precaution.
500-6.Specific Occupancies.
500-7.Class I Locations.
500-8.Class II Locations.
500-9.Class III Locations.
Article 501 - Class I Locations [Go to Page]
501-1.General.
501-2.Transformers and Capacitors.
501-3.Meters, Instruments, and Relays.
501-4.Wiring Methods.
501-5.Sealing and Drainage.
501-6.Switches, Circuit Breakers, Motor Controllers, and Fuses.
501-7.Control Transformers and Resistors.
501-8.Motors and Generators.
501-9.Lighting Fixtures.
501-10.Utilization Equipment.
501-11.Flexible Cords, Class I, Divisions 1 and 2.
501-12.Receptacles and Attachment Plugs, Class I, Divisions 1 and 2.
501-13.Conductor Insulation, Class I, Divisions 1 and 2.
501-14.Signaling, Alarm, Remote-Control, and Communications Systems.
501-15.Live Parts, Class I, Divisions 1 and 2.
501-16.Grounding, Class I, Divisions 1 and 2.
501-17.Surge Protection.
501-18.Multiwire Branch Circuits.
Article 502 - Class II Locations [Go to Page]
502-1.General.
502-2.Transformers and Capacitors.
502-4.Wiring Methods.
502-5.Sealing, Class II, Divisions 1 and 2.
502-6.Switches, Circuit Breakers, Motor Controllers, and Fuses.
502-7.Control Transformers and Resistors.
502-8.Motors and Generators.
502-9.Ventilating Piping.
502-10.Utilization Equipment.
502-11.Lighting Fixtures.
502-12.Flexible Cords - Class II, Divisions 1 and 2.Ã
502-13.Receptacles and Attachment Plugs.
502-14.Signaling, Alarm, Remote-Control, and Communications Systems; and Meters,
502-15.Live Parts, Class II, Divisions 1 and 2.
502-16.Grounding, Class II, Divisions 1 and 2.
502-17.Surge Protection - Class II, Divisions 1 and 2.Ã
502-18.Multiwire Branch Circuits.
Article 503 - Class III Locations [Go to Page]
503-1.General.
503-2.Transformers and Capacitors - Class III, Divisions 1 and 2.
503-3.Wiring Methods.
503-4.Switches, Circuit Breakers, Motor Controllers, and Fuses - Class III, Divisions 1 and 2.
503-5.Control Transformers and Resistors = Class III, Divisions 1 and 2.
503-6.Motors and Generators - Class III, Divisions 1 and 2.
503-7.Ventilating Piping - Class III, Divisions 1 and 2.
503-8.Utilization Equipment - Class III, Divisions 1 and 2.
503-9.Lighting Fixtures - Class III, Divisions 1 and 2.
503-10.Flexible Cords - Class III, Divisions 1 and 2.
503-11.Receptacles and Attachment Plugs - Class III, Divisions 1 and 2.
503-12.Signaling, Alarm, Remote-Control, and Local Loudspeaker Intercommunications
503-13.Electric Cranes, Hoists, and Similar Equipment - Class III, Divisions 1 and 2.
503-14.Storage Battery Charging Equipment - Class III, Divisions 1 and 2.
503-15.Live Parts - Class III, Divisions 1 and 2.
503-16.Grounding - Class III, Divisions 1 and 2.
Article 504 - Intrinsically Safe Systems [Go to Page]
504-1.Scope.
504-2.Definitions.
504-3.Application of Other Articles.
504-4.Equipment Approval.
504-10.Equipment Installation.
504-20.Wiring Methods.
504-30.Separation of Intrinsically Safe Conductors.
504-50.Grounding.
504-60.Bonding.
504-70.Sealing.
504-80.Identification.
Article 505 - Class I, Zone 0, 1, and 2 Locations [Go to Page]
505-1.Scope.
505-2.Other Articles.
505-3.Location and General Requirements.
505-4.Protection Techniques.
505-5.Reference Standards.
505-6.Special Precaution.
505-7.Grouping and Classification.
505-8.Class I Temperature.
505-9.Zone Classification.
505-10.Listing, Marking, and Documentation.
505-15.Wiring Methods.
505-20.Equipment.
505-21.Increased Safety "e" Motors and Generators.
505-25.Grounding and Bonding.
Article 510 - Hazardous (Classified) Locations - Specific [Go to Page]
510-1.Scope.
510-2.General.
Article 511 - Commercial Garages, Repair and Storage [Go to Page]
511-1.Scope.
511-2.Locations.
511-3.Class I Locations.
511-4.Wiring and Equipment in Class I Locations.
511-5.Sealing.
511-6.Wiring in Spaces Above Class I Locations.
511-7.Equipment Above Class I Locations.
511-8.Battery Charging Equipment.
511-9.Electric Vehicle Charging.
511-10.Ground-Fault Circuit-Interrupter Protection for Personnel.
511-16.Grounding.
Article 513 - Aircraft Hangars [Go to Page]
513-1.Scope.
513-2.Definitions.
513-3.Classification of Locations.
513-4.Wiring and Equipment in Class I Locations.
513-5.Wiring Not Within Class I Locations.
513-6.Equipment Not Within Class I Locations.
513-7.Stanchions, Rostrums, and Docks.
513-8.Sealing.
513-9.Aircraft Electrical Systems.
513-10.Aircraft Batteries - Charging and Equipment.Ã
513-11.External Power Sources for Energizing Aircraft.
513-12.Mobile Servicing Equipment with Electric Components.
513-16.Grounding.
Article 514 - Gasoline Dispensing and Service Stations [Go to Page]
514-1.Definition.
514-2.Class I Locations.
514-3.Wiring and Equipment Within Class I Locations.
514-4.Wiring and Equipment Above Class I Locations.
514-5.Circuit Disconnects.
514-6.Provisions for Maintenance and Service of Dispensing Equipment.
514-7.Sealing.
514-8.Underground Wiring.
514-16.Grounding.
Article 515 - Bulk Storage Plants [Go to Page]
515-1.Definition.
515-2.Class I Locations.
515-3.Wiring and Equipment Within Class I Locations.
515-4.Wiring and Equipment Above Class I Locations.
515-5.Underground Wiring.
515-6.Sealing.
515-7.Gasoline Dispensing.
515-16.Grounding.
Article 516 - Spray Application, Dipping, and Coating Processes [Go to Page]
516-1.Scope.
516-2.Classification of Locations.
516-3.Wiring and Equipment in Class I Locations.
516-4.Fixed Electrostatic Equipment.
516-5.Electrostatic Hand-Spraying Equipment.
516-6.Powder Coating.
516-7.Wiring and Equipment Above Class I and II Locations.
516-16.Grounding.
Article 517 - Health Care Facilities [Go to Page]
A.General [Go to Page]
517-1.Scope.
517-2.General.
517-3.Definitions.
B.Wiring and Protection [Go to Page]
517-10.Applicability.
517-11.General Installation - Construction Criteria.
517-12.Wiring Methods.
517-13.Grounding of Receptacles and Fixed Electric Equipment.
517-14.Panelboard Bonding.
517-16.Receptacles with Insulated Grounding Terminals.
517-17.Ground-Fault Protection.
517-18.General Care Areas.
517-19.Critical Care Areas.
517-20.Wet Locations.
517-21.Ground-Fault Circuit-Interrupter Protection for Personnel.
C.Essential Electrical System [Go to Page]
517-25.Scope.
517-30.Essential Electrical Systems for Hospitals.
517-31.Emergency System.
517-32.Life Safety Branch.
517-33.Critical Branch.
517-34.Equipment System Connection to Alternate Power Source.
517-35.Sources of Power.
517-40.Essential Electrical Systems for Nursing Homes and Limited Care Facilities
517-41.Essential Electrical Systems.
517-42.Automatic Connection to Life Safety Branch.
517-43.Connection to Critical Branch.
517-44.Sources of Power.
517-45.Essential Electrical Systems for Ambulatory Health Care Centers.
517-50.Essential Electrical Systems for Clinics, Medical and Dental Offices, and
D.Inhalation Anesthetizing Locations [Go to Page]
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.
E.X-Ray Installations [Go to Page]
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.
F.Communications, Signaling Systems, Data Systems, Fire Alarm Systems, and Systems [Go to Page]
517-80.Patient Care Areas.
517-81.Other-than-Patient-Care Areas.
517-82.Signal Transmission Between Appliances.
G.Isolated Power Systems [Go to Page]
517-160.Isolated Power Systems.
Article 518 - Places of Assembly [Go to Page]
518-1.Scope.
518-2.General Classifications.
518-3.Other Articles.
518-4.Wiring Methods.
518-5.Supply.
Article 520 - Theaters, Audience Areas of Motion Picture and Television Studios [Go to Page]
A.General [Go to Page]
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.
B.Fixed Stage Switchboards [Go to Page]
520-21.Dead Front.
520-22.Guarding Back of Switchboard.
520-23.Control and Overcurrent Protection of Receptacle Circuits.
520-24.Metal Hood.
520-25.Dimmers.
520-26.Type of Switchboard.
520-27.Stage Switchboard Feeders.
C.Fixed Stage Equipment Other than Switchboards [Go to Page]
520-41.Circuit Loads.
520-42.Conductor Insulation.
520-43.Footlights.
520-44.Borders and Proscenium Sidelights.
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.
D.Portable Switchboards on Stage [Go to Page]
520-50.Road Show Connection Panel (A Type of Patch Panel).
520-51.Supply.
520-52.Overcurrent Protection.
520-53.Construction and Feeders.
E.Portable Stage Equipment Other than Switchboards [Go to Page]
520-61.Arc Lamp Fixtures.
520-62.Portable Power Distribution Units.
520-63.Bracket Fixture Wiring.
520-64.Portable Strips.
520-65.Festoons.
520-66.Special Effects.
520-67.Multiple Branch-circuit Cable Connectors..
520-68.Conductors for Portables.
520-69.Adapters.
F.Dressing Rooms [Go to Page]
520-71.Pendant Lampholders.
520-72.Lamp Guards.
520-73.Switches Required.
G.Grounding [Go to Page]
520-81.Grounding.
Article 525 - Carnivals, Circuses, Fairs, and Similar Events [Go to Page]
A.General Requirements [Go to Page]
525-1.Scope.
525-3.Other Articles.
525-6.Protection of Electrical Equipment.
B.Installation [Go to Page]
525-10.Power Sources.
525-12.Overhead Conductor Clearances.
525-13.Wiring Methods.
525-14.Boxes and Fittings.
525-15.Portable Distribution or Termination Boxes.
525-16.Overcurrent Protection.
525-17.Motors.
525-18.Ground-Fault Circuit-Interrupter Protection for Personnel.
C.Grounding and Bonding [Go to Page]
525-20.General.
525-21.Equipment.
525-22.Equipment Grounding Conductor.
D.Disconnecting Means [Go to Page]
525-30.Type and Location.
E.Attractions Utilizing Pools, Fountains, and Similar Installations with Contain [Go to Page]
525-40.Wiring and Equipment.
Article 530 - Motion Picture and Television Studios and Similar Locations [Go to Page]
A.General [Go to Page]
530-1.Scope.
530-2.Definitions.
530-6.Portable Equipment.
B.Stage or Set [Go to Page]
530-11.Permanent Wiring.
530-12.Portable Wiring.
530-13.Stage Lighting and Effects Control.
530-14.Plugging Boxes.
530-15.Enclosing and Guarding Live Parts.
530-16.Portable Lamps.
530-17.Portable Arc Lamp Fixtures.
530-18.Overcurrent Protection.
530-19.Sizing of Feeder Conductors for Television Studio Sets.
530-20.Grounding.
530-21.Plugs and Receptacles.
530-22.Single-Pole Separable Connectors.
530-23.Branch Circuits.
C.Dressing Rooms [Go to Page]
530-31.Dressing Rooms.
D.Viewing, Cutting, and Patching Tables [Go to Page]
530-41.Lamps at Tables.
E.Cellulose Nitrate Film Storage Vaults [Go to Page]
530-51.Lamps in Cellulose Nitrate Film Storage Vaults.
530-52.Motors and Other Equipment in Cellulose Nitrate Film Storage Vaults.
F.Substations [Go to Page]
530-61.Substations.
530-62.Portable Substations.
530-63.Overcurrent Protection of Direct-Current Generators.
530-64.Direct-Current Switchboards.
G.Separately Derived Systems with 60 Volts to Ground [Go to Page]
530-70.General.
530-71.Wiring Methods.
530-72.Grounding.
530-73.Receptacles.
Article 540 - Motion Picture Projectors [Go to Page]
A.General [Go to Page]
540-1.Scope.
B.Definitions [Go to Page]
540-2.Professional Projector.
540-3.Nonprofessional Projector.
C.Equipment and Projectors of the Professional Type [Go to Page]
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.Approval.
540-21.Marking.
D.Nonprofessional Projectors [Go to Page]
540-31.Motion Picture Room Not Required.
540-32.Approval.
E.Audio Signal Processing, Amplification, and Reproduction Equipment [Go to Page]
540-50.Audio Signal Processing, Amplification, and Reproduction Equipment.
Article 545 - Manufactured Buildings [Go to Page]
A.General [Go to Page]
545-1.Scope.
545-2.Other Articles.
545-3.Definitions.
545-4.Wiring Methods.
545-5.Service Entrance Conductors.
545-6.Installation of Service Entrance Conductors.
545-7.Service Equipment.
545-8.Protection of Conductors and Equipment.
545-9.Boxes.
545-10.Receptacle or Switch with Integral Enclosure.
545-11.Bonding and Grounding.
545-12.Grounding Electrode Conductor.
545-13.Component Interconnections.
Article 547 - Agricultural Buildings [Go to Page]
547-1.Scope.
547-2.Other Articles.
547-3.Surface Temperatures.
547-4.Wiring Methods.
547-5.Switches, Circuit Breakers, Controllers, and Fuses.
547-6.Motors.
547-7.Lighting Fixtures.
547-8.Service Equipment, Separately Derived Systems, Feeders, Disconnecting Means
547-9.Bonding and Equipotential Plane.
Article 550 - Mobile Homes, Manufactured Homes, and Mobile Home Parks [Go to Page]
A.General [Go to Page]
550-1.Scope.
550-2.Definitions.
550-3.Other Articles.
550-4.General Requirements.
B.Mobile Homes [Go to Page]
550-5.Power Supply.
550-6.Disconnecting Means and Branch-Circuit Protective Equipment.
550-7.Branch Circuits.
550-8.Receptacle Outlets.
550-9.Fixtures and Appliances.
550-10.Wiring Methods and Materials.
550-11.Grounding.
550-12.Testing.
550-13.Calculations.
550-14.Interconnection of Multiple Section Mobile Home Units.
550-15.Outdoor Outlets, Fixtures, Air-Cooling Equipment, etc.
C.Services and Feeders [Go to Page]
550-21.Distribution System.
550-22.Minimum Allowable Demand Factors.
550-23.Service Equipment.
550-24.Feeder.
Article 551 - Recreational Vehicles and Recreational Vehicle Parks [Go to Page]
A.General [Go to Page]
551-1.Scope.
551-2.Definitions.
551-3.Other Articles.
551-4.General Requirements.
B.Low-Voltage Systems [Go to Page]
551-10.Low-Voltage Systems.
C.Combination Electrical Systems [Go to Page]
551-20.Combination Electrical Systems.
D.Other Power Sources [Go to Page]
551-30.Generator Installations.
551-31.Multiple Supply Source.
551-32.Other Sources.
551-33.Alternate Source Restriction.
E.Nominal 120-Volt or 120/240-Volt Systems [Go to Page]
551-40.120-Volt or 120/240-Volt, Nominal, Systems.
551-41.Receptacle Outlets Required.
551-42.Branch Circuits Required.
551-43.Branch-Circuit Protection.
551-44.Power-Supply Assembly.
551-45.Distribution Panelboard.
551-46.Means for Connecting to Power Supply.
551-47.Wiring Methods.
551-48.Conductors and Boxes.
551-49.Grounded Conductors.
551-50.Connection of Terminals and Splices.
551-51.Switches.
551-52.Receptacles.
551-53.Lighting Fixtures.
551-54.Grounding.
551-55.Interior Equipment Grounding.
551-56.Bonding of Noncurrent-Carrying Metal Parts.
551-57.Appliance Accessibility and Fastening.
F.Factory Tests [Go to Page]
551-60.Factory Tests (Electrical).
G.Recreational Vehicle Parks [Go to Page]
551-71.Type Receptacles Provided.
551-72.Distribution System.
551-73.Calculated Load.
551-74.Overcurrent Protection.
551-75.Grounding.
551-76.Grounding - Recreational Vehicle Site Supply Equipment.
551-77.Recreational Vehicle Site Supply Equipment.
551-78.Protection of Outdoor Equipment.
551-79.Clearance for Overhead Conductors.
551-80.Underground Service, Feeder, Branch-Circuit, and Recreational Vehicle Site
551-81.Receptacles.
Article 552 - Park Trailers [Go to Page]
A.General [Go to Page]
552-1.Scope.
552-2.Definitions.
552-3.Other Articles.
552-4.General Requirements.
B.Low-Voltage Systems [Go to Page]
552-10.Low-Voltage Systems.
C.Combination Electrical Systems [Go to Page]
552-20.Combination Electrical Systems.
D.Nominal 120-Volt or 120/240-Volt Systems [Go to Page]
552-40.120-Volt or 120/240-Volt, Nominal, Systems.
552-41.Receptacle Outlets Required.
552-43.Power Supply.
552-44.Cord.
552-45.Distribution Panelboard.
552-46.Branch Circuits.
552-47.Calculations.
552-48.Wiring Methods.
552-49.Conductors and Boxes.
552-50.Grounded Conductors.
552-51.Connection of Terminals and Splices.
552-52.Switches.
552-53.Receptacles.
552-54.Lighting Fixtures.
552-55.Grounding.
552-56.Interior Equipment Grounding.
552-57.Bonding of Noncurrent-Carrying Metal Parts.
552-58.Appliance Accessibility and Fastening.
552-59.Outdoor Outlets, Fixtures, Air-Cooling Equipment, etc.
E.Factory Tests [Go to Page]
552-60.Factory Tests (Electrical).
Article 553 - Floating Buildings [Go to Page]
A.General [Go to Page]
553-1.Scope.
553-2.Definition.
553-3.Application of Other Articles.
B.Services and Feeders [Go to Page]
553-4.Location of Service Equipment.
553-5.Service Conductors.
553-6.Feeder Conductors.
553-7.Installation of Services and Feeders.
C.Grounding [Go to Page]
553-8.General Requirements.
553-9.Insulated Neutral.
553-10.Equipment Grounding.
553-11.Bonding of Noncurent-Carrying Metal Parts.
Article 555 - Marinas and Boatyards [Go to Page]
555-1.Scope.
555-2.Application of Other Articles.
555-3.Receptacles.
555-4.Disconnecting Means.
555-5.Branch Circuits.
555-6.Feeders and Services.
555-5.Branch Circuits.
555-6.Feeders and Services.
555-7.Wiring Methods.
555-8.Grounding.
555-9.Wiring Over and Under Navigable Water.
555-10.Gasoline Dispensing Stations - Hazardous (Classified) Locations.
555-11.Location of Service Equipment.
CHAPTER 6 Special Equipment [Go to Page]
Article 600 - Electric Signs and Outline Lighting [Go to Page]
A.General [Go to Page]
600-1.Scope.
600-2.Definitions.
600-3.Listing.
600-4.Markings.
600-5.Branch Circuits.
600-6.Disconnects.
600-7.Grounding.
600-8.Enclosures.
600-9.Location.
600-10.Portable or Mobile Signs.
600-21.Ballasts, Transformers, and Electronic Power Supplies.
600-22.Ballasts.
600-23.Transformers and Electronic Power Supplies.
B.Field-Installed Skeleton Tubing [Go to Page]
600-30.Applicability.
600-31.Neon Secondary-Circuit Conductors, 1000 Volts or Less, Nominal.
600-32.Neon Secondary Circuit Conductors, Over 1000 Volts, Nominal.
600-41.Neon Tubing.
600-42.Electrode Connections.
Article 604 - Manufactured Wiring Systems [Go to Page]
604-1.Scope.
604-2.Definition.
604-3.Other Articles.
604-4.Uses Permitted.
604-5.Uses Not Permitted.
604-6.Construction.
604-7.Unused Outlets.
Article 605 - Office Furnishings (Consisting of Lighting Accessories and Wired Partitions) [Go to Page]
605-1.Scope.
605-2.General.
605-3.Wireways.
605-4.Partition Interconnections.
605-5.Lighting Accessories.
605-6.Fixed-Type Partitions.
605-7.Freestanding-Type Partitions.
605-8.Freestanding-Type Partitions, Cord and Plug Connected.
Article 610 - Cranes and Hoists [Go to Page]
A.General [Go to Page]
610-1.Scope.
610-2.Special Requirements for Particular Locations.
B.Wiring [Go to Page]
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.
C.Contact Conductors [Go to Page]
610-21.Installation of Contact Conductors.
610-22.Collectors.
D.Disconnecting Means [Go to Page]
610-31.Runway Conductor Disconnecting Means.
610-32.Disconnecting Means for Cranes and Monorail Hoists.
610-33.Rating of Disconnecting Means.
E.Overcurrent Protection [Go to Page]
610-41.Feeders, Runway Conductors.
610-42.Branch-Circuit Short-Circuit and Ground-Fault Protection.
610-43.Overload Protection.
F.Control [Go to Page]
610-51.Separate Controllers.
610-53.Overcurrent Protection.
610-55.Limit Switch.
610-57.Clearance.
G.Grounding [Go to Page]
610-61.Grounding.
Article 620 - Elevators, Dumbwaiters, Escalators, Moving Walks, Wheelchair Lifts [Go to Page]
A.General [Go to Page]
620-1.Scope.
620-2.Definitions.
620-3.Voltage Limitations.
620-4.Live Parts Enclosed.
620-5.Working Clearances.
B.Conductors [Go to Page]
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.
C.Wiring [Go to Page]
620-21.Wiring Methods.
620-22.Branch Circuits for Car Lighting, Receptacle(s), Ventilation, Heating, and
620-24.Branch Circuit for Hoistway Pit Lighting and Receptacle(s).
620-24.Branch Circuit for Hoistway Pit Lighting and Receptacle(s).
D.Installation of Conductors [Go to Page]
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 and Machine Rooms.
620-38.Electrical Equipment in Garages and Similar Occupancies.
E.Traveling Cables [Go to Page]
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.
F.Disconnecting Means and Control [Go to Page]
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.
G.Overcurrent Protection [Go to Page]
620-61.Overcurrent Protection.
620-62.Selective Coordination.
H.Machine Room [Go to Page]
620-71.Guarding Equipment.
J.Grounding [Go to Page]
620-81.Metal Raceways Attached to Cars.
620-82.Electric Elevators.
620-83.Nonelectric Elevators.
620-84.Escalators, Moving Walks, Wheelchair Lifts, and Stairway Chair Lifts.
620-85.Ground-Fault Circuit-Interrupter Protection for Personnel.
K.Emergency and Standby Power Systems [Go to Page]
620-91.Emergency and Standby Power Systems.
Article 625 - Electric Vehicle Charging System [Go to Page]
A.General [Go to Page]
625-1.Scope.
625-2.Definitions.
625-3.Other Articles.
625-4.Voltages.
625-5.Listed or Labeled.
B.Wiring Methods [Go to Page]
625-9.Electric Vehicle Coupler.
C.Equipment Construction [Go to Page]
625-13.Electric Vehicle Supply Equipment.
625-14.Rating.
625-15.Markings.
625-16.Means of Coupling.
625-17.Cable.
625-18.Interlock.
625-19.Automatic De-energization of Cable.
D.Control and Protection [Go to Page]
625-21.Overcurrent Protection.
625-22.Personnel Protection System.
625-23.Disconnecting Means.
625-25.Loss of Primary Source.
E.Electric Vehicle Supply Equipment Locations [Go to Page]
625-28.Hazardous (Classified) Locations.
625-29.Indoor Sites.
625-30.Outdoor Sites.
Article 630 - Electric Welders [Go to Page]
A.General [Go to Page]
630-1.Scope.
B.Arc Welders [Go to Page]
630-11.Ampacity of Supply Conductors.
630-12.Overcurrent Protection.
630-13.Disconnecting Means.
630-14.Marking.
C.Resistance Welders [Go to Page]
630-31.Ampacity of Supply Conductors.
630-32.Overcurrent Protection.
630-33.Disconnecting Means.
630-34.Marking.
D.Welding Cable [Go to Page]
630-41.Conductors.
630-42.Installation.
Article 640 - Audio Signal Processing, Amplification, and Reproduction Equipment [Go to Page]
A.General [Go to Page]
640-1.Scope.
640-2.Definitions.
640-3.Locations and Other Articles.
640-4.Protection of Electrical Equipment.
640-5.Access to Electrical Equipment Behind Panels Designed to Allow Access.
640-6.Mechanical Execution of Work.
640-7.Grounding.
640-8.Grouping of Conductors.
640-9.Wiring Methods.
640-10.Audio Systems Near Bodies of Water.
B.Permanent Audio System Installations [Go to Page]
640-21.Use of Flexible Cords and Cables.
640-22.Wiring of Equipment Racks.
640-23.Conduit or Tubing.
640-24.Wireways, Gutters, and Auxiliary Gutters.
640-25.Loudspeaker Installation in Fire Resistance-Rated Partitions, Walls, and
C.Portable and Temporary Audio System Installations [Go to Page]
640-41.Multipole Branch-Circuit Cable Connectors.
640-42.Use of Flexible Cords and Cables.
640-43.Wiring of Equipment Racks.
640-44.Environmental Protection of Equipment.
640-45.Protection of Wiring.
640-46.Equipment Access.
Article 645 - Information Technology Equipment [Go to Page]
645-1.Scope.
645-2.Special Requirements for Information Technology Equipment Room.
645-5.Supply Circuits and Interconnecting Cables.
645-6.Cables Not in Information Technology Equipment Room.
645-7.Penetrations.
645-10.Disconnecting Means.
645-11.Uninterruptible Power Supplies (UPS).
645-15.Grounding.
645-16.Marking.
Article 650 - Pipe Organs [Go to Page]
650-1.Scope.
650-2.Other Articles.
650-3.Source of Energy.
650-4.Grounding.
650-5.Conductors.
650-6.Installation of Conductors.
650-7.Overcurrent Protection.
Article 660 - X-Ray Equipment [Go to Page]
A.General [Go to Page]
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.
660-8.Number of Conductors in Raceway.
660-9.Minimum Size of Conductors.
660-10.Equipment Installations.
B.Control [Go to Page]
660-20.Fixed and Stationary Equipment.
660-21.Portable and Mobile Equipment.
660-23.Industrial and Commercial Laboratory Equipment.
660-24.Independent Control.
C.Transformers and Capacitors [Go to Page]
660-35.General.
660-36.Capacitors.
D.Guarding and Grounding [Go to Page]
660-47.General.
660-48.Grounding.
Article 665 - Induction and Dielectric Heating [Go to Page]
A.General [Go to Page]
665-1.Scope.
665-2.Definitions.
665-3.Other Articles.
665-4.Hazardous (Classified) Locations.
B.Guarding, Grounding, and Labeling [Go to Page]
665-20.Enclosures.
665-21.Panel Controls.
665-22.Access to Internal Equipment.
665-23.Warning Labels or Signs.
665-24.Capacitors.
665-25.Work Applicator Shielding.
665-26.Grounding and Bonding.
665-27.Marking.
665-28.Control Enclosures.
C.Motor-Generator Equipment [Go to Page]
665-40.General.
665-41.Ampacity of Supply Conductors.
665-42.Overcurrent Protection.
665-43.Disconnecting Means.
665-44.Output Circuit.
665-47.Remote Control.
D.Equipment Other than Motor-Generators [Go to Page]
665-60.General.
665-61.Ampacity of Supply Conductors.
665-62.Overcurrent Protection.
665-63.Disconnecting Means.
665-64.Output Circuit.
665-66.Line Frequency in Converter Equipment Output.
665-67.Keying.
665-68.Remote Control.
Article 668 - Electrolytic Cells [Go to Page]
668-1.Scope.
668-2.Definitions.
668-3.Other Articles.
668-10.Cell Line Working Zone.
668-11.Direct-Current Cell Line Process Power Supply.
668-12.Cell Line Conductors.
668-13.Disconnecting Means.
668-14.Shunting Means.
668-15.Grounding.
668-20.Portable Electrical Equipment.
668-21.Power Supply Circuits and Receptacles for Portable Electrical Equipment.
668-30.Fixed and Portable Electrical Equipment.
668-31.Auxiliary Nonelectric Connections.
668-32.Cranes and Hoists.
668-40.Enclosures.
Article 669 - Electroplating [Go to Page]
669-1.Scope.
669-2.Other Articles.
669-3.General.
669-5.Branch-Circuit Conductors.
669-6.Wiring Methods.
669-7.Warning Signs.
669-8.Disconnecting Means.
669-9.Overcurrent Protection.
Article 670 - Industrial Machinery [Go to Page]
670-1.Scope.
670-2.Definitions.
670-3.Machine Nameplate Data.
670-4.Supply Conductors and Overcurrent Protection.
670-5.Clearance.
Article 675 - Electrically Driven or Controlled Irrigation Machines [Go to Page]
A.General [Go to Page]
675-1.Scope.
675-2.Definitions.
675-3.Other Articles.
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.
B.Center Pivot Irrigation Machines [Go to Page]
675-21.General.
675-22.Equivalent Current Ratings.
Article 680 - Swimming Pools, Fountains, and Similar Installations [Go to Page]
A.General [Go to Page]
680-1.Scope.
680-2.Approval of Equipment.
680-3.Other articles.
680-4.Definitions.
680-5.Transformers and Ground-Fault Circuit Interrupters.
680-6.Receptacles, Lighting Fixtures, Lighting Outlets, Switching Devices, and C
680-7.Cord- and Plug-Connected Equipment.
680-8.Overhead Conductor Clearances.
680-9.Electric Pool Water Heaters.
680-10.Underground Wiring Location.
680-11.Equipment Rooms and Pits.
680-12.Disconnecting Means.
B.Permanently Installed Pools [Go to Page]
680-20.Underwater Lighting Fixtures.
680-21.Junction Boxes and Enclosures for Transformers or Ground-Fault Circuit Interrupters.
680-22.Bonding.
680-23.Underwater Audio Equipment.
680-24.Grounding.
680-25.Methods of Grounding.
680-26.Electrically Operated Pool Covers.
680-27.Deck Area Heating.
680-28.Double Insulated Pool Pumps.
C.Storable Pools [Go to Page]
680-30.Pumps.
680-31.Ground-Fault Circuit Interrupters Required.
680-32.Lighting Fixtures.
D.Spas and Hot Tubs [Go to Page]
680-38.Emergency Switch for Spas and Hot Tubs.
680-40.Outdoor Installations.
680-41.Indoor Installations.
680-42.Protection.
E.Fountains [Go to Page]
680-50.General.
680-51.Lighting Fixtures, 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.
F.Pools and Tubs for Therapeutic Use [Go to Page]
680-60.General.
680-61.Permanently Installed Therapeutic Pools.
680-62.Therapeutic Tubs (Hydrotherapeutic Tanks).
G.Hydromassage Bathtubs [Go to Page]
680-70.Protection.
680-71.Other Electrical Equipment.
680-72.Accessibility.
680-73.Bonding.
Article 685 - Integrated Electrical Systems [Go to Page]
A.General [Go to Page]
685-1.Scope.
685-2.Application of Other Articles.
B.Orderly Shutdown [Go to Page]
685-10.Location of Overcurrent Devices in or on Premises.
685-12.Direct-Current System Grounding.
685-14.Ungrounded Control Circuits.
Article 690 - Solar Photovoltaic Systems [Go to Page]
A.General [Go to Page]
690-1.Scope.
690-2.Definitions.
690-3.Other Articles.
690-4.Installation.
690-5.Ground-Fault Protection.
690-6.Alternating-Current Modules.
B.Circuit Requirements [Go to Page]
690-7.Maximum Voltage.
690-8.Circuit Sizing and Current.
690-9.Overcurrent Protection.
690-10.Stand-Alone Systems.
C.Disconnecting Means [Go to Page]
690-13.All Conductors.
690-14.Additional Provisions.
690-15.Disconnection of Photovoltaic Equipment.
690-16.Fuses.
690-17.Switch or Circuit Breaker.
690-18.Installation and Service of an Array.
D.Wiring Methods [Go to Page]
690-31.Methods Permitted.
690-32.Component Interconnections.
690-33.Connectors.
690-34.Access to Boxes.
E.Grounding [Go to Page]
690-41.System Grounding.
690-42.Point of System Grounding Connection.
690-43.Equipment Grounding.
690-45.Size of Equipment Grounding Conductor.
690-47.Grounding Electrode System.
F.Marking [Go to Page]
690-51.Modules.
690-52.Alternating-Current Photovoltaic Modules.
690-53.Photovoltaic Power Source.
690-54.Interactive System Point of Interconnection.
G.Connection to Other Sources [Go to Page]
690-60.Identified Interactive Equipment.
690-61.Loss of Interactive System Power.
690-62.Ampacity of Neutral Conductor.
690-63.Unbalanced Interconnections.
690-64.Point of Connection.
H.Storage Batteries [Go to Page]
690-71.Installation.
690-72.Charge Control.
690-74.Battery Interconnections.
I.Systems Over 600 Volts [Go to Page]
690-80.General.
690-85.Definitions.
Article 695 - Fire Pumps [Go to Page]
695-1.Scope.
695-2.Application of Other Articles.
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.
CHAPTER 7 Special Conditions [Go to Page]
Article 700 - Emergency Systems [Go to Page]
A.General [Go to Page]
700-1.Scope.
700-2.Application of Other Articles.
700-3.Equipment Approval.
700-4.Tests and Maintenance.
700-5.Capacity.
700-6.Transfer Equipment.
700-7.Signals.
700-8.Signs.
B.Circuit Wiring [Go to Page]
700-9.Wiring, Emergency System.
C.Sources of Power [Go to Page]
700-12.General Requirements.
D.Emergency System Circuits for Lighting and Power [Go to Page]
700-15.Loads on Emergency Branch Circuits.
700-16.Emergency Illumination.
700-17.Circuits for Emergency Lighting.
700-18.Circuits for Emergency Power.
E.Control - Emergency Lighting Circuits [Go to Page]
700-20.Switch Requirements.
700-21.Switch Location.
700-22.Exterior Lights.
F.Overcurrent Protection [Go to Page]
700-25.Accessibility.
700-26.Ground-Fault Protection of Equipment.
Article 701 - Legally Required Standby Systems [Go to Page]
A.General [Go to Page]
701-1.Scope.
701-2.Legally Required Standby Systems.
701-3.Application of Other Articles.
701-4.Equipment Approval.
701-5.Tests and Maintenance for Legally Required Standby Systems.
701-6.Capacity and Rating.
701-7.Transfer Equipment.
701-8.Signals.
701-9.Signs.
B.Circuit Wiring [Go to Page]
701-10.Wiring Legally Required Standby Systems.
C.Sources of Power [Go to Page]
701-11.Legally Required Standby Systems.
D.Overcurrent Protection [Go to Page]
701-15.Accessibility.
701-17.Ground-Fault Protection of Equipment.
Article 702 - Optional Standby Systems [Go to Page]
A.General [Go to Page]
702-1.Scope.
702-2.Optional Standby Systems.
702-3.Application of Other Articles.
702-4.Equipment Approval.
702-5.Capacity and Rating.
702-6.Transfer Equipment.
702-7.Signals.
702-8.Signs.
B.Circuit Wiring [Go to Page]
702-9.Wiring Optional Standby Systems.
Article 705 - Interconnected Electric Power Production Sources [Go to Page]
705-1.Scope.
705-2.Definition.
705-3.Other Articles.
705-10.Directory.
705-12.Point of Connection.
705-14.Output Characteristics.
705-16.Interrupting and Short-Circuit Current Rating.
705-20.Disconnecting Means, Sources.
705-21.Disconnecting Means, Equipment.
705-22.Disconnect Device.
705-30.Overcurrent Protection.
705-32.Ground-Fault Protection.
705-40.Loss of Primary Source.
705-42.Unbalanced Interconnections.
705-43.Synchronous Generators.
705-50.Grounding.
Article 720 - Circuits and Equipment Operating at Less than 50 Volts [Go to Page]
720-1.Scope.
720-2.Hazardous (Classified) Locations.
720-4.Conductors.
720-5.Lampholders.
720-6.Receptacle Rating.
720-7.Receptacles Required.
720-8.Overcurrent Protection.
720-9.Batteries.
720-10.Grounding.
720-11.Mechanical Execution of Work.
Article 725 - Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits [Go to Page]
A.General [Go to Page]
725-1.Scope.
725-2.Definitions.
725-3.Locations and Other Articles.
725-5.Access to Electrical Equipment Behind Panels Designed to Allow Access.
725-6.Class 1, Class 2, and Class 3 Circuit Grounding.
725-7.Mechanical Execution of Work.
725-8.Safety-Control Equipment.
725-15.Class 1, Class 2, and Class 3 Circuit Requirements.
B.Class 1 Circuits [Go to Page]
725-21.Class 1 Circuit Classifications and Power Source Requirements.
725-23.Class 1 Circuit Overcurrent Protection.
725-24.Class 1 Circuit Overcurrent Device Location.
725-25.Class 1 Circuit Wiring Methods.
725-26.Conductors of Different Circuits in Same Cable, Enclosure, or Raceway.
725-27.Class 1 Circuit Conductors.
725-28.Number of Conductors in Cable Trays and Raceway, and Derating.
725-29.Circuits Extending Beyond One Building.
C.Class 2 and Class 3 Circuits [Go to Page]
725-41.Power Sources for Class 2 and Class 3 Circuits.
725-51.Wiring Methods on Supply Side of the Class 2 or Class 3 Power Source.
725-52.Wiring Methods and Materials on Load Side of the Class 2 or Class 3 Power
725-54.Installation of Conductors and Equipment.
725-61.Applications of Listed Class 2, Class 3, and PLTC Cables.
725-71.Listing and Marking of Class 2, Class 3, and Type PLTC Cables.
Article 727 - Instrumentation Tray Cable: Type ITC [Go to Page]
727-1.Scope.
727-2.Definition.
727-3.Other Articles.
727-4.Uses Permitted.
727-5.Uses Not Permitted.
727-6.Construction.
727-7.Marking.
727-8.Allowable Ampacity.
727-9.Overcurrent Protection.
727-10.Bends.
Article 760 - Fire Alarm Systems [Go to Page]
A.General [Go to Page]
760-1.Scope.
760-2.Definitions.
760-3.Locations and Other Articles.
760-5.Access to Electrical Equipment Behind Panels Designed to Allow Access.
760-6.Fire Alarm Circuit and Equipment Grounding.
760-7.Fire Alarm Circuits Extending Beyond One Building.
760-8.Mechanical Execution of Work.
760-10.Fire Alarm Circuit Identification.
760-15.Fire Alarm Circuit Requirements.
B.Nonpower-Limited Fire Alarm (NPLFA) Circuits [Go to Page]
760-21.NPLFA Circuit Power Source Requirements.
760-23.NPLFA Circuit Overcurrent Protection.
760-24.NPLFA Circuit Overcurrent Device Location.Ã
760-25.NPLFA Circuit Wiring Methods.
760-26.Conductors of Different Circuits in Same Cable, Enclosure, or Raceway.
760-27.NPLFA Circuit Conductors.
760-28.Number of Conductors in Cable Trays and Raceways, and Derating.
760-30.Multiconductor NPLFA Cables.
760-31.Listing and Marking of NPLFA Cables.
C.Power-Limited Fire Alarm (PLFA) Circuits [Go to Page]
760-41.Power Sources for PLFA Circuits.
760-42.Circuit Marking.
760-51.Wiring Methods on Supply Side of the PLFA Power Source.
760-52.Wiring Methods and Materials on Load Side of the PLFA Power Source.
760-54.Installation of Conductors and Equipment.
760-55.Current-Carrying Continuous Line-Type Fire Detectors.
760-61.Applications of Listed PLFA Cables.
760-71.Listing and Marking of PLFA Cables and InsuÃlated Continuous Line-Type Fire Detectors.
Article 770 - Optical Fiber Cables and Raceways [Go to Page]
A.General [Go to Page]
770-1.Scope.
770-2.Definitions.
770-3.Locations and Other Articles.
770-4.Optical Fiber Cables.
770-5.Types.
770-6.Raceways for Optical Fiber Cables.
770-7.Access to Electrical Equipment Behind Panels Designed to Allow Access.
770-8.Mechanical Execution of Work.
B.Protection [Go to Page]
770-33.Grounding of Entrance Cables.
C.Cables Within Buildings [Go to Page]
770-49.Fire Resistance of Optical Fiber Cables.
770-50.Listing, Marking, and Installation of Optical Fiber Cables.
770-51.Listing Requirements for Optical Fiber Cables and Raceways.
770-52.Installation of Optical Fibers and Electrical Conductors.
770-53.Applications of Listed Optical Fiber Cables and Raceways.
Article 780 - Closed-Loop and Programmed Power Distribution [Go to Page]
780-1.Scope.
780-2.General.
780-3.Control.
780-5.Power Limitation in Signaling Circuits.
780-6.Cables and Conductors.
780-7.Noninterchangeability.
CHAPTER 8 Communications Systems [Go to Page]
Article 800 - Communications Circuits [Go to Page]
A.General [Go to Page]
800-1.Scope.
800-2.Definitions.
800-3.Hybrid Power and Communications Cables.
800-4.Equipment.
800-5.Access to Electrical Equipment Behind Panels Designed to Allow Access.
800-6.Mechanical Execution of Work.
800-7.Hazardous (Classified) Locations.
B.Conductors Outside and Entering Buildings [Go to Page]
800-10.Overhead Communications Wires and Cables.
800-11.Underground Circuits Entering Buildings.
800-12.Circuits Requiring Primary Protectors.
800-13.Lightning Conductors.
C.Protection [Go to Page]
800-30.Protective Devices.
800-31.Primary Protector Requirements.
800-32.Secondary Protector Requirements.
800-33.Cable Grounding.
D.Grounding Methods [Go to Page]
800-40.Cable and Primary Protector Grounding.
800-41.Primary Protector Grounding and Bonding at Mobile Homes.
E.Communications Wires and Cables Within Buildings [Go to Page]
800-48.Raceways for Communications Wires and Cables.
800-49.Fire Resistance of Communications Wires and Cables.
800-50.Listing, Marking, and Installation of Communications Wires and Cables.
800-51.Listing Requirements for Communications Wires and Cables and Communications Raceways.
800-52.Installation of Communications Wires, Cables, and Equipment.
800-53.Applications of Listed Communications Wires and Cables, and Communications Raceways.
Article 810 - Radio and Television Equipment [Go to Page]
A.General [Go to Page]
810-1.Scope.
810-2.Other Articles.
810-3.Community Television Antenna.
810-4.Radio Noise Suppressors.
810-5.Definitions.
B.Receiving Equipment - Antenna Systems [Go to Page]
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.Electric Supply Circuits Used in Lieu of Antenna - Receiving Stations.
810-20.Antenna Discharge Units - Receiving Stations.
810-21.Grounding Conductors Receiving Stations.
C.Amateur Transmitting and Receiving Stations - Antenna Systems [Go to Page]
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 ÃStations.
810-58.Grounding Conductors - Amateur Transmitting and Receiving Stations.
D.Interior Installation - Transmitting Stations [Go to Page]
810-70.Clearance from Other Conductors.
810-71.General.
Article 820 - Community Antenna Television and Radio Distribution Systems [Go to Page]
A.General [Go to Page]
820-1.Scope.
820-2.Definitions.
820-3.Locations and Other Articles.
820-4.Energy Limitations.
820-5.Access to Electrical Equipment Behind Panels Designed to Allow Access.
820-6.Mechanical Execution of Work.
B.Cables Outside and Entering Buildings [Go to Page]
820-10.Outside Cables.
820-11.Entering Buildings.
C.Protection [Go to Page]
820-33.Grounding of Outer Conductive Shield of a Coaxial Cable.
D.Grounding Methods [Go to Page]
820-40.Cable Grounding.
820-41.Equipment Grounding.
820-42.Bonding and Grounding at Mobile Homes.
E.Cables Within Buildings [Go to Page]
820-49.Fire Resistance of CATV Cables.
820-50.Listing, Marking, and Installation of Coaxial Cables.
820-51.Additional Listing Requirements.
820-52.Installation of Cables and Equipment.
820-53.Applications of Listed CATV Cables.
Article 830 - Network-Powered Broadband Communications Systems [Go to Page]
A.General [Go to Page]
830-1.Scope.
830-2.Definitions.
830-3.Locations and Other Articles.
830-4.Power Limitations.
830-5.Network-Powered Broadband Communications Equipment and Cables.
830-6.Access to Electrical Equipment Behind Panels Designed to Allow Access.
830-7.Mechanical Execution of Work.
830-8.Hazardous (Classified) Locations.
B.Cables Outside and Entering Buildings [Go to Page]
830-9.Entrance Cables.
830-10.Aerial Cables.
830-11.Underground Circuits Entering Buildings.
C.Protection [Go to Page]
830-30.Primary Electrical Protection.
830-33.Grounding or Interruption of Metallic Members of Network-Powered Broadband Communications Cables.
D.Grounding Methods [Go to Page]
830-40.Cable, Network Interface Unit, and Primary Protector Grounding.
830-42.Bonding and Grounding at Mobile Homes.
E.Network-Powered Broadband Communications SysÃtems Wiring Methods Within Buildi [Go to Page]
830-54.Medium Power Network-Powered Broadband Communications System Wiring Methods Within Buildings.
830-55.Low Power Network-Powered Broadband ComÃmunications System Wiring Methods.
830-56.Protection Against Physical Damage.
830-57.Bends.
830-58.Installation of Network-Powered Broadband Communications Cables and Equipment.
CHAPTER 9 Tables
APPENDIX A Extract References
APPENDIX B [Go to Page]
B-310-15(b)(1).Formula Application Information.
B-310-15(b)(2).Typical Applications Covered by Tables.
B-310-15(b)(3).Criteria Modifications.
B-310-15(b)(4).Electrical Ducts.
B-310-15(b)(5).Tables B-310-6 and B-310-7.
B-310-15(b)(6).Electrical Ducts Utilized in Figure B-310-2.
B-310-15(b)(7).Examples Showing Use of Figure B-310-1 for Electrical Duct Bank Ampacity Modifications.
APPENDIX C Conduit and Tubing Fill Tables for Conductors and Fixture Wires of the same Size
APPENDIX D
APPENDIX E Article 250 Cross Reference [Go to Page]
E2.ï¿½Cross Reference from the 1996 NEC to the 1999 NEC
E2.ï¿½Cross Reference from the 1996 NEC to the 1999 NEC
INDEX [Go to Page]

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