{"id":135829,"date":"2024-10-19T07:49:41","date_gmt":"2024-10-19T07:49:41","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/nfpa-70-1999\/"},"modified":"2024-10-25T00:00:06","modified_gmt":"2024-10-25T00:00:06","slug":"nfpa-70-1999","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/nfpa\/nfpa-70-1999\/","title":{"rendered":"NFPA 70 1999"},"content":{"rendered":"

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PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
5<\/td>\nCONTENTS <\/td>\n<\/tr>\n
10<\/td>\nNATIONAL ELECTRIC CODE COMMITTEE <\/td>\n<\/tr>\n
20<\/td>\nNFPA 70
Article 90 – Introduction
90-1.Purpose.
90-2.Scope.
90-3.Code Arrangement. <\/td>\n<\/tr>\n
21<\/td>\n90-4.Enforcement.
90-5.Mandatory Rules, Permissive Rules, and Explana\u00c3\u008dtory Material.
90-6.Formal Interpretations.
90-7.Examination of Equipment for Safety.
90-8.Wiring Planning.
90-9.Metric Units of Measurement. <\/td>\n<\/tr>\n
22<\/td>\nCHAPTER 1 General
Article 100 – Definitions
A.General <\/td>\n<\/tr>\n
28<\/td>\nB.Over 600 Volts, Nominal <\/td>\n<\/tr>\n
29<\/td>\nArticle 110 – Requirements for Electrical Installations
A.General
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. <\/td>\n<\/tr>\n
30<\/td>\n110-9.Interrupting Rating.
110-10.Circuit Impedance and Other Characteristics.\u00c3\u008f
110-11.Deteriorating Agents.
110-12.Mechanical Execution of Work.
110-13.Mounting and Cooling of Equipment.
110-14.Electrical Connections. <\/td>\n<\/tr>\n
31<\/td>\n110-18.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
110-26.Spaces About Electrical Equipment. <\/td>\n<\/tr>\n
33<\/td>\n110-27.Guarding of Live Parts.
C.Over 600 Volts, Nominal
110-30.General.
110-31.Enclosure for Electrical Installations. <\/td>\n<\/tr>\n
34<\/td>\n110-32.Work Space About Equipment.
110-33.Entrance and Access to Work Space.
110-34.Work Space and Guarding. <\/td>\n<\/tr>\n
35<\/td>\n110-36.Circuit Conductors.
110-40.Temperature Limitations at Terminations.
D.Tunnel Installations Over 600 Volts, Nominal
110-51.General. <\/td>\n<\/tr>\n
36<\/td>\n110-52.Overcurrent Protection.
110-53.Conductors.
110-54.Bonding and Equipment Grounding Conduc\u00c3\u008dtors.
110-56.Energized Parts.
110-57.Ventilation System Controls.
110-58.Disconnecting Means.
110-59.Enclosures. <\/td>\n<\/tr>\n
37<\/td>\nCHAPTER 2 Wiring and Protection
Article 200 – Use and Identification of Grounded Conductors
200-1.Scope.
200-2.General.
200-3.Connection to Grounded System.
200-6.Means of Identifying Grounded Conductors. <\/td>\n<\/tr>\n
38<\/td>\n200-7.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. <\/td>\n<\/tr>\n
39<\/td>\n200-11.Polarity of Connections.
Article 210 – Branch Circuits
A.General Provisions
210-1.Scope.
210-2.Other Articles for Specific-Purpose Branch Cir\u00c3\u008dcuits.
210-3.Rating.
210-4.Multiwire Branch Circuits. <\/td>\n<\/tr>\n
40<\/td>\n210-5.Identification for Branch Circuits.
210-6.Branch-Circuit Voltage Limitations.
210-7.Receptacles and Cord Connectors. <\/td>\n<\/tr>\n
41<\/td>\n210-8.Ground-Fault Circuit-Interrupter Protection for Personnel. <\/td>\n<\/tr>\n
42<\/td>\n210-9.Circuits Derived from Autotransformers.
210-10.Ungrounded Conductors Tapped from Grounded Systems.
210-11.Branch Circuits Required. <\/td>\n<\/tr>\n
43<\/td>\n210-12.Arc-Fault Circuit-Interrupter Protection.
B.Branch-Circuit Ratings
210-19.Conductors – Minimum Ampacity and Size. <\/td>\n<\/tr>\n
44<\/td>\n210-20.Overcurrent Protection.
210-21.Outlet Devices. <\/td>\n<\/tr>\n
45<\/td>\n210-23.Permissible Loads.
210-24.Branch Circuit Requirements – Summary.
210-25.Common Area Branch Circuits.
C.Required Outlets
210-50.General. <\/td>\n<\/tr>\n
46<\/td>\n210-52.Dwelling Unit Receptacle Outlets. <\/td>\n<\/tr>\n
47<\/td>\n210-60.Guest Rooms.
210-62.Show Windows.
210-63.Heating, Air-Conditioning, and Refrigeration Equipment Outlet.
210-70.Lighting Outlets Required. <\/td>\n<\/tr>\n
48<\/td>\nArticle 215 – Feeders
215-1.Scope.
215-2.Minimum Rating and Size. <\/td>\n<\/tr>\n
49<\/td>\n215-3.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. <\/td>\n<\/tr>\n
50<\/td>\nArticle 220 – Branch-Circuit, Feeder, and Service Calculations
A.General
220-1.Scope.
220-2.Computations.
220-3.Computation of Branch Circuit Loads. <\/td>\n<\/tr>\n
51<\/td>\n220-4.Maximum Loads.
B.Feeders and Services
220-10.General.
220-11.General Lighting.
220-12.Show-Window and Track Lighting. <\/td>\n<\/tr>\n
52<\/td>\n220-13.Receptacle Loads \u00b5 Nondwelling Units.
220-13.Receptacle Loads \u00b5 Nondwelling Units.
220-14.Motors.
220-15.Fixed Electric Space Heating.
220-16.Small Appliance and Laundry Loads \u00b5 Dwell\u00cding Unit.
220-17.Appliance Load \u00b5 Dwelling Unit(s).
220-18.Electric Clothes Dryers \u00b5 Dwelling Unit(s).
220-19.Electric Ranges and Other Cooking Appli-\u00cfances \u00b5 Dwelling Unit(s). <\/td>\n<\/tr>\n
54<\/td>\n220-20.Kitchen Equipment \u00b5 Other Than Dwelling Unit(s).
220-20.Kitchen Equipment \u00b5 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
220-30.Optional Calculation \u00b5 Dwelling Unit. <\/td>\n<\/tr>\n
55<\/td>\n220-31.Optional Calculation for Additional Loads in Existing Dwelling Unit.
220-32.Optional Calculation \u00b5 Multifamily Dwelling. <\/td>\n<\/tr>\n
56<\/td>\n220-33.Optional Calculation \u00b5 Two Dwelling Units.\u00cf
220-34.Optional Method \u00b5 Schools.
220-35.Optional Calculations for Determining Existing Loads.
220-36.Optional Calculation \u00b5 New Restaurants. <\/td>\n<\/tr>\n
57<\/td>\nD.Method for Computing Farm Loads
220-40.Farm Loads \u00b5 Buildings and Other Loads.
220-41.Farm Loads \u00b5 Total.
Article 225 – Outside Branch Circuits and Feeders
225-1.Scope.
225-2.Other Articles. <\/td>\n<\/tr>\n
58<\/td>\nA.General
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. <\/td>\n<\/tr>\n
59<\/td>\n225-10.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. <\/td>\n<\/tr>\n
60<\/td>\n225-20.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
225-30.Number of Supplies. <\/td>\n<\/tr>\n
61<\/td>\n225-31.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. <\/td>\n<\/tr>\n
62<\/td>\n225-38.Disconnect Construction.
225-39.Rating of Disconnect.
225-40.Access to Overcurrent Protective Devices.
C.Over 600 Volts
225-50.Warning Signs.
225-51.Isolating Switches.
225-52.Location.
225-53.Type. <\/td>\n<\/tr>\n
63<\/td>\nArticle 230 – Services
230-1.Scope.
A.General
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. <\/td>\n<\/tr>\n
64<\/td>\n230-7.Other Conductors in Raceway or Cable.
230-8.Raceway Seal.
230-9.Clearance from Building Openings.
B.Overhead Service-Drop Conductors
230-21.Overhead Supply.
230-22.Insulation or Covering.
230-23.Size and Rating.
230-24.Clearances. <\/td>\n<\/tr>\n
65<\/td>\n230-26.Point of Attachment.
230-27.Means of Attachment.
230-28.Service Masts as Supports.
230-29.Supports Over Buildings.
C.Underground Service-Lateral Conductors
230-30.Insulation.
230-31.Size and Rating.
230-32.Protection Against Damage. <\/td>\n<\/tr>\n
66<\/td>\nD.Service-Entrance Conductors
230-40.Number of Service-Entrance Conductor Sets.
230-41.Insulation of Service-Entrance Conductors.
230-42.Minimum Size and Rating.
230-43.Wiring Methods for 600 Volts, Nominal, or Less.
230-46.Spliced Conductors. <\/td>\n<\/tr>\n
67<\/td>\n230-49.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. <\/td>\n<\/tr>\n
68<\/td>\n230-56.Service Conductor with the Higher Voltage to Ground.
E.Service Equipment – General
230-62.Service Equipment – Enclosed or Guarded.
230-66.Marking.
F.Service Equipment – Disconnecting Means
230-70.General.
230-71.Maximum Number of Disconnects.
230-72.Grouping of Disconnects. <\/td>\n<\/tr>\n
69<\/td>\n230-74.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. <\/td>\n<\/tr>\n
70<\/td>\nG.Service Equipment – Overcurrent Protection
230-90.Where Required.
230-91.Location.
230-92.Locked Service Overcurrent Devices.
230-93.Protection of Specific Circuits.
230-94.Relative Location of Overcurrent Device and Other Service Equipment.
230-95.Ground-Fault Protection of Equipment. <\/td>\n<\/tr>\n
71<\/td>\nH.Services Exceeding 600 Volts, Nominal
230-200.General.
230-202.Service-Entrance Conductors.
230-203.Warning Signs.
230-204.Isolating Switches.
230-205.Disconnecting Means. <\/td>\n<\/tr>\n
72<\/td>\n230-206.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
240-1.Scope.
A.General
240-2.Protection of Equipment. <\/td>\n<\/tr>\n
73<\/td>\n240-3.Protection of Conductors. <\/td>\n<\/tr>\n
74<\/td>\n240-4.Protection of Flexible Cords and Fixture Wires.\u00c3\u008f
240-6.Standard Ampere Ratings.
240-8.Fuses or Circuit Breakers in Parallel. <\/td>\n<\/tr>\n
75<\/td>\n240-9.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.\u00c3\u008f
B.Location
240-20.Ungrounded Conductors.
240-21.Location in Circuit. <\/td>\n<\/tr>\n
78<\/td>\n240-22.Grounded Conductor.
240-23.Change in Size of Grounded Conductor.
240-24.Location in or on Premises.
C.Enclosures
240-30.General.
240-32.Damp or Wet Locations.
240-33.Vertical Position.
D.Disconnecting and Guarding
240-40.Disconnecting Means for Fuses.
240-41.Arcing or Suddenly Moving Parts. <\/td>\n<\/tr>\n
79<\/td>\nE.Plug Fuses, Fuseholders, and Adapters
240-50.General.
240-51.Edison-Base Fuses.
240-52.Edison-Base Fuseholders.
240-53.Type S Fuses.
240-54.Type S Fuses, Adapters, and Fuseholders.
F.Cartridge Fuses and Fuseholders
240-60.General. <\/td>\n<\/tr>\n
80<\/td>\n240-61.Classification.
G.Circuit Breakers
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
240-90.General.
240-91.Definition of Supervised Industrial Installa\u00c3\u008dtion. <\/td>\n<\/tr>\n
81<\/td>\n240-92.Location in Circuit. <\/td>\n<\/tr>\n
82<\/td>\nI.Overcurrent Protection Over 600 Volts, Nominal
240-100.Feeders and Branch Circuits.
240-101.Additional Requirements for Feeders.
Article 250 – Grounding
A.General
250-1.Scope.
250-2.General Requirements for Grounding and Bond\u00c3\u008ding. <\/td>\n<\/tr>\n
83<\/td>\n250-4.Application of Other Articles. <\/td>\n<\/tr>\n
84<\/td>\n250-6.Objectionable Current Over Grounding Con\u00c3\u008dductors.
250-8.Connection of Grounding and Bonding Equip\u00c3\u008dment.
250-10.Protection of Ground Clamps and Fittings.\u00c3\u008f <\/td>\n<\/tr>\n
85<\/td>\n250-12.Clean Surfaces.
B.Circuit and System Grounding
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. <\/td>\n<\/tr>\n
86<\/td>\n250-26.Conductor to Be Grounded – Alternating-Current Systems. <\/td>\n<\/tr>\n
87<\/td>\n250-28.Main Bonding Jumper.
250-30.Grounding Separately Derived Alternating-Current Systems. <\/td>\n<\/tr>\n
88<\/td>\n250-32.Two or More Buildings or Structures Supplied from a Common Service. <\/td>\n<\/tr>\n
89<\/td>\n250-34.Portable and Vehicle-Mounted Generators.
250-36.High-Impedence Grounded Neutral Systems. <\/td>\n<\/tr>\n
90<\/td>\nC.Grounding Electrode System and Grounding Electrode Conductor
250-50.Grounding Electrode System. <\/td>\n<\/tr>\n
91<\/td>\n250-52.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. <\/td>\n<\/tr>\n
92<\/td>\n250-62.Grounding Electrode Conductor Material.
250-64.Grounding Electrode Conductor Installation.
250-66.Size of Alternating-Current Grounding Electrode Conductor. <\/td>\n<\/tr>\n
93<\/td>\n250-68.Grounding Electrode Conductor Connection to Grounding Electrodes.
250-70.Methods of Grounding Conductor Connection to Electrodes.
D.Enclosure, Raceway, and Service Cable Grounding
250-80.Service Raceways and Enclosures.
250-84.Underground Service Cable or Conduit.
250-86.Other Conductor Enclosures and Raceways. <\/td>\n<\/tr>\n
94<\/td>\nE.Bonding
250-90.General.
250-92.Services.
250-94.Method of Bonding at the Service.
250-96.Bonding Other Enclosures. <\/td>\n<\/tr>\n
95<\/td>\n250-97.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. <\/td>\n<\/tr>\n
96<\/td>\n250-106.Lightning Protection Systems.
F.Equipment Grounding and Equipment Grounding Conductors
250-110.Equipment Fastened in Place or Connected by Permanent Wiring Methods <\/td>\n<\/tr>\n
97<\/td>\n250-112.Fastened in Place or Connected by Permanent Wiring Methods (Fixed) –
250-114.Equipment Connected by Cord and Plug. <\/td>\n<\/tr>\n
98<\/td>\n250-116.Nonelectric Equipment.
250-118.Types of Equipment Grounding Conductors.
250-119.Identification of Equipment Grounding Conductors. <\/td>\n<\/tr>\n
99<\/td>\n250-120.Equipment Grounding Conductor Installation.
250-122.Size of Equipment Grounding Conductors. <\/td>\n<\/tr>\n
100<\/td>\n250-124.Equipment Grounding Conductor Continuity.
250-126.Identification of Wiring Device Terminals.
G.Methods of Equipment Grounding
250-130.Equipment Grounding Conductor Connections. <\/td>\n<\/tr>\n
101<\/td>\n250-132.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. <\/td>\n<\/tr>\n
102<\/td>\n250-144.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
250-160.General. <\/td>\n<\/tr>\n
103<\/td>\n250-162.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
250-170.Instrument Transformer Circuits. <\/td>\n<\/tr>\n
104<\/td>\n250-172.Instrument Transformer Cases.
250-174.Cases of Instruments, Meters, and Relays Op\u00c3\u008derating 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)
250-180.General.
250-182.Derived Neutral Systems.
250-184.Solidly Grounded Neutral Systems.
250-186.Impedance Grounded Neutral Systems. <\/td>\n<\/tr>\n
105<\/td>\n250-188.Grounding of Systems Supplying Portable or Mobile Equipment.
250-190.Grounding of Equipment.
Article 280 – Surge Arresters
A.General
280-1.Scope.
280-2.Definition.
280-3.Number Required.
280-4.Surge Arrester Selection. <\/td>\n<\/tr>\n
106<\/td>\nB.Installation
280-11.Location.
280-12.Routing of Surge Arrester Connections.
C.Connecting Surge Arresters
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 \u00b5 Interconnections.
280-25.Grounding. <\/td>\n<\/tr>\n
107<\/td>\nCHAPTER 3 Wiring Methods and Materials
Article 300 – Wiring Methods
A.General Requirements
300-1.Scope.
300-2.Limitations.
300-3.Conductors. <\/td>\n<\/tr>\n
108<\/td>\n300-4.Protection Against Physical Damage. <\/td>\n<\/tr>\n
109<\/td>\n300-5.Underground Installations.
300-6.Protection Against Corrosion. <\/td>\n<\/tr>\n
111<\/td>\n300-8.Installation of Conductors with Other Sys\u00c3\u008dtems.
300-8.Installation of Conductors with Other Systems.
300-10.Electrical Continuity of Metal Raceways and Enclosures.
300-11.Securing and Supporting. <\/td>\n<\/tr>\n
112<\/td>\n300-12.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. <\/td>\n<\/tr>\n
113<\/td>\n300-16.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. <\/td>\n<\/tr>\n
114<\/td>\n300-20.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. <\/td>\n<\/tr>\n
115<\/td>\n300-23.Panels Designed to Allow Access.
B.Requirements for Over 600 Volts, Nominal
300-31.Covers Required.
300-32.Conductors of Different Systems.
300-34.Conductor Bending Radius.
300-35.Protection Against Induction Heating.
300-37.Aboveground Wiring Methods.
300-39.Braid-Covered Insulated Conductors – Open Installation.
300-40.Insulation Shielding. <\/td>\n<\/tr>\n
116<\/td>\n300-42.Moisture or Mechanical Protection for Metal-Sheathed Cables.
300-50.Underground Installations. <\/td>\n<\/tr>\n
117<\/td>\nArticle 305 – Temporary Wiring
305-1.Scope.
305-2.All Wiring Installations.
305-3.Time Constraints.
305-4.General. <\/td>\n<\/tr>\n
118<\/td>\n305-6.Ground-Fault Protection for Personnel.
305-7.Guarding.
Article 310 – Conductors for General Wiring
310-1.Scope. <\/td>\n<\/tr>\n
119<\/td>\n310-2.Conductors.
310-3.Stranded Conductors.
310-4.Conductors in Parallel.
310-5.Minimum Size of Conductors. <\/td>\n<\/tr>\n
120<\/td>\n310-6.Shielding.
310-7.Direct Burial Conductors.
310-8.Locations.
310-9.Corrosive Conditions.
310-10.Temperature Limitation of Conductors. <\/td>\n<\/tr>\n
121<\/td>\n310-11.Marking. <\/td>\n<\/tr>\n
122<\/td>\n310-12.Conductor Identification.
310-13.Conductor Constructions and Applications.
310-14.Aluminum Conductor Material. <\/td>\n<\/tr>\n
125<\/td>\n310-15.Ampacities for Conductors Rated 0\u00c5\u201a2000 Volts. <\/td>\n<\/tr>\n
127<\/td>\n310-60.Conductors Rated 2001 to 35,000 Volts. <\/td>\n<\/tr>\n
142<\/td>\nArticle 318 – Cable Trays
318-1.Scope.
318-2.Definition.
318-3.Uses Permitted. <\/td>\n<\/tr>\n
143<\/td>\n318-4.Uses Not Permitted.
318-5.Construction Specifications.
318-6.Installation. <\/td>\n<\/tr>\n
144<\/td>\n318-7.Grounding.
318-8.Cable Installation. <\/td>\n<\/tr>\n
145<\/td>\n318-9.Number of Multiconductor Cables, Rated 2000 Volts or Less, in Cable Trays. <\/td>\n<\/tr>\n
146<\/td>\n318-10.Number of Single Conductor Cables, Rated 2000 Volts or Less, in Cable Tra <\/td>\n<\/tr>\n
147<\/td>\n318-11.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 <\/td>\n<\/tr>\n
148<\/td>\nArticle 320 – Open Wiring on Insulators
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. <\/td>\n<\/tr>\n
149<\/td>\n320-11.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
321-1.Definition. <\/td>\n<\/tr>\n
150<\/td>\n321-2.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
324-1.Definition.
324-2.Other Articles.
324-3.Uses Permitted.
324-4.Uses Not Permitted.
324-5.Conductors. <\/td>\n<\/tr>\n
151<\/td>\n324-6.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
A.General
325-1.Definition.
325-2.Other Articles.
325-3.Uses Permitted.
325-4.Uses Not Permitted. <\/td>\n<\/tr>\n
152<\/td>\nB.Installation
325-11.Bending Radius.
325-12.Bends.
325-13.Fittings.
325-14.Ampacity.
C.Construction Specifications
325-20.Conductors.
325-21.Insulation.
325-22.Conduit.
325-24.Marking.
Article 326 – Medium Voltage Cable: Type MV
326-1.Definition.
326-2.Other Articles.
326-3.Uses Permitted. <\/td>\n<\/tr>\n
153<\/td>\n326-4.Uses Not Permitted.
326-5.Construction.
326-6.Ampacity.
326-7.Marking.
Article 328 – Flat Conductor Cable: Type FCC
A.General
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
328-10.Coverings. <\/td>\n<\/tr>\n
154<\/td>\n328-11.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
328-30.Type FCC Cable.
328-31.Markings.
328-32.Conductor Identification.
328-33.Corrosion Resistance.
328-34.Insulation.
328-35.Shields. <\/td>\n<\/tr>\n
155<\/td>\n328-36.Receptacles and Housings.
328-37.Transition Assemblies.
Article 330 – Mineral-Insulated, Metal-Sheathed Cable: Type MI
A.General
330-1.Definition.
330-2.Other Articles.
330-3.Uses Permitted.
330-4.Uses Not Permitted.
B.Installation
330-10.Wet Locations.
330-11.Through Joists, Studs, or Rafters.
330-12.Supports.
330-13.Bends.
330-14.Fittings. <\/td>\n<\/tr>\n
156<\/td>\n330-15.Terminal Seals.
330-16.Single Conductors.
C.Construction Specifications
330-20.Conductors.
330-21.Insulation.
330-22.Outer Sheath.
Article 331 – Electrical Nonmetallic Tubing
A.General
331-1.Definition.
331-2.Other Articles.
331-3.Uses Permitted.
331-4.Uses Not Permitted. <\/td>\n<\/tr>\n
157<\/td>\nB.Installation
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
331-15.General.
Article 333 – Armored Cable: Type AC
A.General
333-1.Definition. <\/td>\n<\/tr>\n
158<\/td>\n333-2.Other Articles.
333-3.Uses Permitted.
333-4.Uses Not Permitted.
B.Installation
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. <\/td>\n<\/tr>\n
159<\/td>\nC.Construction Specifications
333-19.Construction.
333-20.Conductors.
333-21.Grounding.
333-22.Marking.
Article 334 – Metal-Clad Cable: Type MC
A.General
334-1.Definition.
334-2.Other Articles.
334-3.Uses Permitted.
334-4.Uses Not Permitted.
B.Installation
334-10.Installation. <\/td>\n<\/tr>\n
160<\/td>\n334-11.Bending Radius.
334-12.Fittings.
334-13.Ampacity.
C.Construction Specifications
334-20.Conductors.
334-21.Insulation.
334-22.Metallic Sheath.
334-23.Grounding.
334-24.Marking. <\/td>\n<\/tr>\n
161<\/td>\nArticle 336 – Nonmetallic-Sheathed Cable: Types NM, NMC, and NMS
336-1.Scope.
A.General
336-2.Definition.
336-3.Other Articles.
336-4.Uses Permitted.
336-5.Uses Not Permitted.
B.Installation
336-6.Exposed Work \u00b5 General. <\/td>\n<\/tr>\n
162<\/td>\n336-9.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
336-30.General. <\/td>\n<\/tr>\n
163<\/td>\n336-31.Marking.
Article 338 – Service-Entrance Cable: Types SE and USE
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. <\/td>\n<\/tr>\n
164<\/td>\nArticle 339 – Underground Feeder and Branch-Circuit Cable: Type UF
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
340-1.Definition.
340-2.Other Articles.
340-3.Construction. <\/td>\n<\/tr>\n
165<\/td>\n340-4.Use Permitted.
340-5.Uses Not Permitted.
340-6.Marking.
340-7.Ampacity.
340-8.Bends.
Article 342 – Nonmetallic Extensions
342-1.Definition.
342-2.Other Articles.
342-3.Uses Permitted. <\/td>\n<\/tr>\n
166<\/td>\n342-4.Uses Not Permitted.
342-5.Splices and Taps.
342-6.Fittings.
342-7.Installation.
342-8.Marking.
Article 343 – Nonmetallic Underground Conduit with Conductors
A.General
343-1.Description.
343-2.Other Articles. <\/td>\n<\/tr>\n
167<\/td>\n343-3.Uses Permitted.
343-4.Uses Not Permitted.
B.Installation
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
343-13.General.
343-14.Conductors and Cables. <\/td>\n<\/tr>\n
168<\/td>\n343-15.Conductor Fill.
343-16.Marking.
Article 345 – Intermediate Metal Conduit
A.General
345-1.Definition.
345-2.Other Articles.
345-3.Uses Permitted.
B.Installation
345-5.Wet Locations.
345-6.Size.
345-7.Number of Conductors in Conduit.
345-8.Reaming and Threading.
345-9.Couplings and Connectors. <\/td>\n<\/tr>\n
169<\/td>\n345-10.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
345-16.General.
Article 346 – Rigid Metal Conduit
A.General
346-1.Definition.
346-2.Other Articles.
346-3.Uses Permitted. <\/td>\n<\/tr>\n
170<\/td>\n346-5.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. <\/td>\n<\/tr>\n
171<\/td>\n346-12.Securing and Supporting.
346-13.Boxes and Fittings.
346-14.Splices and Taps.
346-15.Bushings.
C.Construction Specifications
346-16.General.
Article 347 – Rigid Nonmetallic Conduit
347-1.Description. <\/td>\n<\/tr>\n
172<\/td>\n347-2.Uses Permitted.
347-3.Uses Not Permitted.
347-4.Other Articles.
A.Installations
347-5.Trimming.
347-6.Joints.
347-8.Securing and Supporting. <\/td>\n<\/tr>\n
173<\/td>\n347-9.Expansion Fittings.
347-10.Size.
347-11.Number of Conductors.
347-12.Bushings.
347-13.Bends – How Made. <\/td>\n<\/tr>\n
174<\/td>\n347-14.Bends – Number in One Run.
347-15.Boxes and Fittings.
347-16.Splices and Taps.
B.Construction Specifications
347-17.General.
Article 348 – Electrical Metallic Tubing
A.General
348-1.Definition.
348-2.Other Articles.
348-4.Uses Permitted. <\/td>\n<\/tr>\n
175<\/td>\n348-5.Uses Not Permitted.
B.Installation
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. <\/td>\n<\/tr>\n
176<\/td>\n348-15.Splices and Taps.
C.Construction Specifications
348-16.General.
Article 349 – Flexible Metallic Tubing
A.General
349-1.Definition.
349-3.Other Articles.
349-4.Uses Permitted.
349-5.Uses Not Permitted.
B.Construction and Installation
349-10.Size.
349-12.Number of Conductors.
349-16.Grounding.
349-17.Splices and Taps.
349-18.Fittings.
349-20.Bends. <\/td>\n<\/tr>\n
177<\/td>\nArticle 350 – Flexible Metal Conduit
A.General
350-1.Scope.
350-2.Definition.
350-3.Other Articles.
350-4.Uses Permitted.
350-5.Uses Not Permitted.
B.Installation
350-10.Size.
350-12.Number of Conductors.
350-14.Grounding. <\/td>\n<\/tr>\n
178<\/td>\n350-16.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
351-1.Scope.
A.Liquidtight Flexible Metal Conduit
351-2.Definition.
351-3.Other Articles.
351-4.Use. <\/td>\n<\/tr>\n
179<\/td>\n351-5.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
351-22.Definition.
351-23.Use. <\/td>\n<\/tr>\n
180<\/td>\n351-24.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
A.Surface Metal Raceways
352-1.Uses. <\/td>\n<\/tr>\n
181<\/td>\n352-2.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
352-21.Description.
352-22.Use.
352-23.Other Articles. <\/td>\n<\/tr>\n
182<\/td>\n352-24.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
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. <\/td>\n<\/tr>\n
183<\/td>\n352-47.Support of Strut-Type Channel Raceways.
352-48.Splices and Taps.
352-49.General.
352-50.Grounding.
352-51.Marking.
Article 353 – Multioutlet Assembly
353-1.Other Articles.
353-2.Use.
353-3.Metal Multioutlet Assembly Through Dry Partitions.
Article 354 – Underfloor Raceways
354-1.Other Articles. <\/td>\n<\/tr>\n
184<\/td>\n354-2.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. <\/td>\n<\/tr>\n
185<\/td>\n354-15.Connections to Cabinets and Wall Outlets.
Article 356 – Cellular Metal Floor Raceways
356-1.Definitions.
356-2.Uses Not Permitted.
356-3.Other Articles.
A.Installation
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
356-12.General. <\/td>\n<\/tr>\n
186<\/td>\nArticle 358 – Cellular Concrete Floor Raceways
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
A.Metal Wireways
362-1.Definition.
362-2.Uses. <\/td>\n<\/tr>\n
187<\/td>\n362-3.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. <\/td>\n<\/tr>\n
188<\/td>\nB.Nonmetallic Wireways
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. <\/td>\n<\/tr>\n
189<\/td>\n362-27.Marking.
Article 363 – Flat Cable Assemblies: Type FC
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. <\/td>\n<\/tr>\n
190<\/td>\n363-20.Terminal Block Identification.
Article 364 – Busways
A.General Requirements
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. <\/td>\n<\/tr>\n
191<\/td>\n364-9.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
364-21.Identification.
364-22.Grounding. <\/td>\n<\/tr>\n
192<\/td>\n364-23.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
365-1.Definition.
365-2.Use.
365-3.Conductors. <\/td>\n<\/tr>\n
193<\/td>\n365-5.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
A.Scope and General
370-1.Scope.
370-2.Round Boxes.
370-3.Nonmetallic Boxes.
370-4.Metal Boxes.
370-5.Short Radius Conduit Bodies. <\/td>\n<\/tr>\n
194<\/td>\nB.Installation
370-15.Damp, Wet, or Hazardous (Classified) Locations.
370-16.Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit B <\/td>\n<\/tr>\n
195<\/td>\n370-17.Conductors Entering Boxes, Conduit Bodies, or Fittings. <\/td>\n<\/tr>\n
196<\/td>\n370-18.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. <\/td>\n<\/tr>\n
197<\/td>\n370-24.Depth of Outlet Boxes.
370-25.Covers and Canopies. <\/td>\n<\/tr>\n
198<\/td>\n370-27.Outlet Boxes.
370-28.Pull and Junction Boxes. <\/td>\n<\/tr>\n
199<\/td>\n370-29.Conduit Bodies, Junction, Pull, and Outlet Boxes to Be Accessible.
C.Construction Specifications
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
370-50.General. <\/td>\n<\/tr>\n
200<\/td>\n370-51.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. <\/td>\n<\/tr>\n
201<\/td>\n370-59.Fixed Ladders.
E.Pull and Junction Boxes for Use on Systems Over 600 Volts, Nominal
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
373-1.Scope.
A.Installation
373-2.Damp, Wet, or Hazardous (Classified) \u00c3\u02c6Loca\u00c3\u008dtions. <\/td>\n<\/tr>\n
202<\/td>\n373-3.Position in Wall.
373-4.Unused Openings.
373-5.Cabinets, Cutout Boxes, and Meter Socket En-\u00c3\u008fclosures.
373-6.Deflection of Conductors. <\/td>\n<\/tr>\n
203<\/td>\n373-7.Space in Enclosures.
373-8.Enclosures for Switches or Overcurrent Devices.
373-9.Side or Back Wiring Spaces or Gutters.
B.Construction Specifications
373-10.Material. <\/td>\n<\/tr>\n
204<\/td>\n373-11.Spacing.
Article 374 – Auxiliary Gutters
374-1.Use.
374-2.Extension Beyond Equipment.
374-3.Supports. <\/td>\n<\/tr>\n
205<\/td>\n374-4.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. <\/td>\n<\/tr>\n
206<\/td>\nArticle 380 – Switches
A.Installation
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. <\/td>\n<\/tr>\n
207<\/td>\n380-7.Indicating.
380-8.Accessibility and Grouping.
380-9.Provisions for Snap Switch Faceplates.
380-10.Mounting of Snap Switches. <\/td>\n<\/tr>\n
208<\/td>\n380-11.Circuit Breakers as Switches.
380-12.Grounding of Enclosures.
380-13.Knife Switches.
380-14.Rating and Use of Snap Switches. <\/td>\n<\/tr>\n
209<\/td>\nB.Construction Specifications
380-15.Marking.
380-16.600-Volt Knife Switches.
380-17.Fused Switches.
380-18.Wire-Bending Space.
Article 384 – Switchboards and Panelboards
A.General
384-1.Scope.
384-2.Other Articles.
384-3.Support and Arrangement of Busbars and Conductors. <\/td>\n<\/tr>\n
210<\/td>\n384-4.Installation.
B.Switchboards
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
384-13.General.
384-14.Classification of Panelboards.
384-15.Number of Overcurrent Devices on One Panelboard. <\/td>\n<\/tr>\n
211<\/td>\n384-16.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. <\/td>\n<\/tr>\n
212<\/td>\nD.Construction Specifications
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. <\/td>\n<\/tr>\n
213<\/td>\nCHAPTER 4 Equipment for General Use
Article 400 – Flexible Cords and Cables
A.General
400-1.Scope.
400-2.Other Articles.
400-3.Suitability.
400-4.Types.
400-5.Ampacities for Flexible Cords and Cables. <\/td>\n<\/tr>\n
220<\/td>\n400-6.Markings. <\/td>\n<\/tr>\n
221<\/td>\n400-7.Uses Permitted.
400-8.Uses Not Permitted.
400-9.Splices. <\/td>\n<\/tr>\n
222<\/td>\n400-10.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
400-20.Labels.
400-21.Nominal Insulation Thickness.
400-22.Grounded-Conductor Identification.
400-23.Equipment Grounding Conductor Identification. <\/td>\n<\/tr>\n
223<\/td>\n400-24.Attachment Plugs.
C.Portable Cables Over 600 Volts, Nominal
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
402-1.Scope.
402-2.Other Articles.
402-3.Types. <\/td>\n<\/tr>\n
226<\/td>\n402-5.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. <\/td>\n<\/tr>\n
227<\/td>\nArticle 410 – Lighting Fixtures, Lampholders, Lamps, and Receptacles
A.General
410-1.Scope.
410-2.Application of Other Articles.
410-3.Live Parts.
B.Fixture Locations
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. <\/td>\n<\/tr>\n
228<\/td>\n410-9.Space for Cove Lighting.
C.Provisions at Fixture Outlet Boxes, Canopies, and Pans
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. <\/td>\n<\/tr>\n
229<\/td>\nD.Fixture Supports
410-15.Supports.
410-16.Means of Support. <\/td>\n<\/tr>\n
230<\/td>\nE.Grounding
410-17.General.
410-18.Exposed Fixture Parts.
410-20.Equipment Grounding Conductor Attachment.
410-21.Methods of Grounding.
F.Wiring of Fixtures
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. <\/td>\n<\/tr>\n
231<\/td>\n410-30.Cord-Connected Lampholders and Fixtures.
410-31.Fixtures as Raceways.
G.Construction of Fixtures
410-34.Combustible Shades and Enclosures.
410-35.Fixture Rating.
410-36.Design and Material. <\/td>\n<\/tr>\n
232<\/td>\n410-37.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
410-47.Screw-Shell Type.
410-48.Double-Pole Switched Lampholders.
410-49.Lampholders in Wet or Damp Locations.
J.Construction of Lampholders
410-50.Insulation.
410-52.Switched Lampholders. <\/td>\n<\/tr>\n
233<\/td>\nK.Lamps and Auxiliary Equipment
410-53.Bases, Incandescent Lamps.
410-54.Electric-Discharge Lamp Auxiliary \u00c3\u02c6Equip\u00c3\u008dment.
L.Receptacles, Cord Connectors, and Attachment Plugs (Caps)
410-56.Rating and Type. <\/td>\n<\/tr>\n
234<\/td>\n410-57.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
410-64.General.
410-65.Temperature. <\/td>\n<\/tr>\n
235<\/td>\n410-66.Clearance and Installation.
410-67.Wiring.
N.Construction of Flush and Recessed Fixtures
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
410-73.General. <\/td>\n<\/tr>\n
236<\/td>\n410-74.Direct-Current Equipment.
410-75.Open-Circuit Voltage Exceeding 300 Volts.\u00c3\u008f
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
410-80.General.
410-81.Control. <\/td>\n<\/tr>\n
237<\/td>\n410-82.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
410-100.Definition.
410-101.Installation.
410-103.Heavy-Duty Lighting Track. <\/td>\n<\/tr>\n
238<\/td>\n410-104.Fastening.
410-105.Construction Requirements.
Article 411 – Lighting Systems Operating at 30 Volts or Less
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
A.General
422-1.Scope.
422-3.Other Articles.
422-4.Live Parts.
B.Installation
422-10.Branch-Circuit Rating. <\/td>\n<\/tr>\n
239<\/td>\n422-11.Overcurrent Protection.
422-12.Central Heating Equipment. <\/td>\n<\/tr>\n
240<\/td>\n422-13.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. <\/td>\n<\/tr>\n
241<\/td>\n422-20.Other Installation Methods.
C.Disconnecting Means
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. <\/td>\n<\/tr>\n
242<\/td>\n422-35.Disconnecting Means for Motor-Driven Appliance.
D.Construction
422-40.Polarity in Cord- and Plug-Connected Appliances.
422-41.Cord- and Plug-Connected Appliances Subject to Immersion.
422-42.Signals for Heated Appliances.
422-43.Flexible Cords.
422-44.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. <\/td>\n<\/tr>\n
243<\/td>\n422-50.Cord- and Plug-Connected Pipe Heating Assemblies.
E.Marking
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
A.General
424-1.Scope.
424-2.Other Articles.
424-3.Branch Circuits. <\/td>\n<\/tr>\n
244<\/td>\nB.Installation
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
424-19.Disconnecting Means. <\/td>\n<\/tr>\n
245<\/td>\n424-20.Thermostatically Controlled Switching Devices.
424-21.Switch and Circuit Breaker to Be Indicat\u00c3\u008ding.
424-22.Overcurrent Protection. <\/td>\n<\/tr>\n
246<\/td>\nD.Marking of Heating Equipment
424-28.Nameplate.
424-29.Marking of Heating Elements.
E.Electric Space-Heating Cables
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. <\/td>\n<\/tr>\n
247<\/td>\n424-40.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. <\/td>\n<\/tr>\n
248<\/td>\n424-45.Inspection and Tests.
F.Duct Heaters
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
424-70.Scope. <\/td>\n<\/tr>\n
249<\/td>\n424-71.Identification.
424-72.Overcurrent Protection.
424-73.Over-Temperature Limit Control.
424-74.Over-Pressure Limit Control.
H.Electrode-Type Boilers
424-80.Scope.
424-81.Identification.
424-82.Branch-Circuit Requirements. <\/td>\n<\/tr>\n
250<\/td>\n424-83.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
424-90.Scope.
424-91.Definitions.
424-92.Markings.
424-93.Installation. <\/td>\n<\/tr>\n
251<\/td>\n424-94.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. <\/td>\n<\/tr>\n
252<\/td>\n424-99.Installation Under Floor Covering.
Article 426 – Fixed Outdoor Electric Deicing and Snow-Melting Equipment
A.General
426-1.Scope.
426-2.Definitions.
426-3.Application of Other Articles. <\/td>\n<\/tr>\n
253<\/td>\n426-4.Branch-Circuit Sizing.
B.Installation
426-10.General.
426-11.Use.
426-12.Thermal Protection.
426-13.Identification.
426-14.Special Permission.
C.Resistance Heating Elements
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. <\/td>\n<\/tr>\n
254<\/td>\n426-23.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
426-30.Personnel Protection.
426-31.Isolation Transformer.
426-32.Voltage Limitations.
426-33.Induced Currents.
426-34.Grounding.
E.Skin-Effect Heating
426-40.Conductor Ampacity.
426-41.Pull Boxes.
426-42.Single Conductor in Enclosure. <\/td>\n<\/tr>\n
255<\/td>\n426-43.Corrosion Protection.
426-44.Grounding.
F.Control and Protection
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
A.General
427-1.Scope.
427-2.Definitions. <\/td>\n<\/tr>\n
256<\/td>\n427-3.Application of Other Articles.
427-4.Branch-Circuit Sizing.
B.Installation
427-10.General.
427-11.Use.
427-12.Thermal Protection.
427-13.Identification.
C.Resistance Heating Elements
427-14.Secured.
427-15.Not in Direct Contact.
427-16.Expansion and Contraction.
427-17.Flexural Capability.
427-18.Power Supply Leads. <\/td>\n<\/tr>\n
257<\/td>\n427-19.Electrical Connections.
427-20.Marking.
427-22.Equipment Protection.
427-23.Metal Covering.
D.Impedance Heating
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
427-35.Scope.
427-36.Personnel Protection.
427-37.Induced Current.
F.Skin-Effect Heating
427-45.Conductor Ampacity.
427-46.Pull Boxes. <\/td>\n<\/tr>\n
258<\/td>\n427-47.Single Conductor in Enclosure.
427-48.Grounding.
G.Control and Protection
427-55.Disconnecting Means.
427-56.Controls.
427-57.Overcurrent Protection.
Article 430 – Motors, Motor Circuits, and Controllers
A.General
430-1.Scope.
430-2.Adjustable-Speed Drive Systems.
430-3.Part-Winding Motors. <\/td>\n<\/tr>\n
259<\/td>\n430-5.Other Articles.
430-6.Ampacity and Motor Rating Determination. <\/td>\n<\/tr>\n
260<\/td>\n430-7.Marking on Motors and Multimotor Equipment. <\/td>\n<\/tr>\n
261<\/td>\n430-8.Marking on Controllers.
430-9.Terminals. <\/td>\n<\/tr>\n
262<\/td>\n430-10.Wiring Space in Enclosures.
430-11.Protection Against Liquids.
430-12.Motor Terminal Housings.
430-13.Bushing. <\/td>\n<\/tr>\n
263<\/td>\n430-14.Location of Motors.
430-16.Exposure to Dust Accumulations. <\/td>\n<\/tr>\n
264<\/td>\n430-17.Highest Rated or Smallest Rated Motor.
430-18.Nominal Voltage of Rectifier Systems.
B.Motor Circuit Conductors
430-21.General.
430-22.Single Motor.
430-23.Wound-Rotor Secondary. <\/td>\n<\/tr>\n
265<\/td>\n430-24.Several Motors or a Motor(s) and Other Load(s).\u00c3\u008f
430-25.Multimotor and Combination-Load Equipment..
430-26.Feeder Demand Factor.
430-27.Capacitors with Motors.
430-28.Feeder Taps. <\/td>\n<\/tr>\n
266<\/td>\n430-29.Constant Voltage Direct-Current Motors – Power Resistors.
C.Motor and Branch-Circuit Overload Protection
430-31.General.
430-32.Continuous-Duty Motors. <\/td>\n<\/tr>\n
267<\/td>\n430-33.Intermittent and Similar Duty.
430-34.Selection of Overload Relay. <\/td>\n<\/tr>\n
268<\/td>\n430-35.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. <\/td>\n<\/tr>\n
269<\/td>\n430-42.Motors on General-Purpose Branch Circuits.
430-43.Automatic Restarting.
430-44.Orderly Shutdown.
D.Motor Branch-Circuit Short-Circuit and Ground-Fault Protection
430-51.General.
430-52.Rating or Setting for Individual Motor Circuit. <\/td>\n<\/tr>\n
270<\/td>\n430-53.Several Motors or Loads on One Branch Circuit. <\/td>\n<\/tr>\n
271<\/td>\n430-54.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. <\/td>\n<\/tr>\n
272<\/td>\nE.Motor Feeder Short-Circuit and Ground-Fault Protection
430-61.General.
430-62.Rating or Setting – Motor Load.
430-63.Rating or Setting – Power and Light Loads.
F.Motor Control Circuits
430-71.General.
430-72.Overcurrent Protection. <\/td>\n<\/tr>\n
273<\/td>\n430-73.Mechanical Protection of Conductor.
430-74.Disconnection. <\/td>\n<\/tr>\n
274<\/td>\nG.Motor Controllers
430-81.General.
430-82.Controller Design.
430-83.Ratings. <\/td>\n<\/tr>\n
275<\/td>\n430-84.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
430-92.General.
430-94.Overcurrent Protection. <\/td>\n<\/tr>\n
276<\/td>\n430-95.Service-Entrance Equipment.
430-96.Grounding.
430-97.Busbars and Conductors. <\/td>\n<\/tr>\n
277<\/td>\n430-98.Marking.
J.Disconnecting Means
430-101.General.
430-102.Location.
430-103.Operation.
430-104.To Be Indicating.
430-105.Grounded Conductors.
430-107.Readily Accessible.
430-108.Every Switch. <\/td>\n<\/tr>\n
278<\/td>\n430-109.Type.
430-110.Ampere Rating and Interrupting Capacity. <\/td>\n<\/tr>\n
279<\/td>\n430-111.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. <\/td>\n<\/tr>\n
280<\/td>\nK.Over 600 Volts, Nominal
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
430-131.General.
430-132.Where Required. <\/td>\n<\/tr>\n
281<\/td>\n430-133.Guards for Attendants.
M.Grounding – All Voltages
430-141.General.
430-142.Stationary Motors.
430-143.Portable Motors.
430-144.Controllers.
430-145.Method of Grounding. <\/td>\n<\/tr>\n
282<\/td>\nN.Tables <\/td>\n<\/tr>\n
285<\/td>\nArticle 440 – Air-Conditioning and Refrigerat\u00c3\u008ding Equipment
A.General
440-1.Scope.
440-2.Definitions.
440-3.Other Articles. <\/td>\n<\/tr>\n
286<\/td>\n440-4.Marking on Hermetic Refrigerant Motor-Compressors and Equipment.
440-5.Marking on Controllers.
440-6.Ampacity and Rating. <\/td>\n<\/tr>\n
287<\/td>\n440-7.Highest Rated (Largest) Motor.
440-8.Single Machine.
B.Disconnecting Means
440-11.General.
440-12.Rating and Interrupting Capacity. <\/td>\n<\/tr>\n
288<\/td>\n440-13.Cord-Connected Equipment.
440-14.Location.
C.Branch-Circuit Short-Circuit and Ground-Fault Protection
440-21.General.
440-22.Application and Selection. <\/td>\n<\/tr>\n
289<\/td>\nD.Branch-Circuit Conductors
440-31.General.
440-32.Single Motor-Compressor.
440-33.Motor-Compressor(s) With or Without Addi\u00c3\u008dtional Motor Loads.
440-34.Combination Load.
440-35.Multimotor and Combination-Load Equipment.
E.Controllers for Motor-Compressors
440-41.Rating. <\/td>\n<\/tr>\n
290<\/td>\nF.Motor-Compressor and Branch-Circuit Overload Protection
440-51.General.
440-52.Application and Selection.
440-53.Overload Relays.
440-54.Motor-Compressors and Equipment on 15- or 20-Ampere Branch Circuits – Not <\/td>\n<\/tr>\n
291<\/td>\n440-55.Cord- and Attachment Plug-Connected Motor-Compressors and Equipment on 15-
G.Provisions for Room Air Conditioners
440-60.General.
440-61.Grounding.
440-62.Branch-Circuit Requirements.
440-63.Disconnecting Means.
440-64.Supply Cords.
Article 445 – Generators
445-1.General.
445-2.Location.
445-3.Marking. <\/td>\n<\/tr>\n
292<\/td>\n445-4.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)
450-1.Scope. <\/td>\n<\/tr>\n
293<\/td>\nA.General Provisions
450-2.Definitions.
450-3.Overcurrent Protection. <\/td>\n<\/tr>\n
294<\/td>\n450-4.Autotransformers 600 Volts, Nominal, or Less.
450-5.Grounding Autotransformers. <\/td>\n<\/tr>\n
295<\/td>\n450-6.Secondary Ties. <\/td>\n<\/tr>\n
296<\/td>\n450-7.Parallel Operation.
450-8.Guarding.
450-9.Ventilation.
450-10.Grounding.
450-11.Marking.
450-12.Terminal Wiring Space. <\/td>\n<\/tr>\n
297<\/td>\n450-13.Accessibility.
B.Specific Provisions Applicable to Different Types of Transformers
450-21.Dry-Type Transformers Installed Indoors.
450-22.Dry-Type Transformers Installed Outdoors.
450-23.Less-Flammable Liquid-Insulated Transformers. <\/td>\n<\/tr>\n
298<\/td>\n450-24.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
450-41.Location. <\/td>\n<\/tr>\n
299<\/td>\n450-42.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
A.General
455-1.Scope. <\/td>\n<\/tr>\n
300<\/td>\n455-2.Definitions.
455-3.Other Articles.
455-4.Marking.
455-5.Equipment Grounding Connection.
455-6.Conductors.
455-7.Overcurrent Protection.
455-8.Disconnecting Means. <\/td>\n<\/tr>\n
301<\/td>\n455-9.Connection of Single-Phase Loads.
455-10.Terminal Housings.
B.Specific Provisions Applicable to Different Types of Phase Converters
455-20.Disconnecting Means.
455-21.Start-Up.
455-22.Power Interruption.
455-23.Capacitors.
Article 460 – Capacitors
460-1.Scope.
460-2.Enclosing and Guarding.
A.600 Volts, Nominal, and Under
460-6.Discharge of Stored Energy.
460-8.Conductors. <\/td>\n<\/tr>\n
302<\/td>\n460-9.Rating or Setting of Motor Overload Device.
460-10.Grounding.
460-12.Marking.
B.Over 600 Volts, Nominal
460-24.Switching.
460-25.Overcurrent Protection. <\/td>\n<\/tr>\n
303<\/td>\n460-26.Identification.
460-27.Grounding.
460-28.Means for Discharge.
Article 470 – Resistors and Reactors (For Rheostats, See Section 430-82.)
A.600 Volts, Nominal, and Under
470-1.Scope.
470-2.Location.
470-3.Space Separation.
470-4.Conductor Insulation.
B.Over 600 Volts, Nominal
470-18.General.
470-19.Grounding.
470-20.Oil-Filled Reactors.
Article 480 – Storage Batteries
480-1.Scope. <\/td>\n<\/tr>\n
304<\/td>\n480-2.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. <\/td>\n<\/tr>\n
305<\/td>\nArticle 490 – Equipment, Over 600 Volts, Nominal
A.General
490-1.Scope.
490-2.Definition.
490-3.Oil-Filled Equipment.
B.Equipment – Specific Provisions
490-21.Circuit-Interrupting Devices. <\/td>\n<\/tr>\n
307<\/td>\n490-22.Isolating Means.
490-23.Voltage Regulators.
490-24.Minimum Space Separation.
C.Equipment – Metal-Enclosed Power Switchgear and Industrial Control Assemblies
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. <\/td>\n<\/tr>\n
308<\/td>\n490-35.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. <\/td>\n<\/tr>\n
309<\/td>\n490-42.Interlocks – Interrupter Switches.
490-43.Stored Energy for Opening.
490-44.Fused Interrupter Switches.
490-45.Interlocks – Circuit Breakers.
D.Mobile and Portable Equipment
490-51.General.
490-52.Overcurrent Protection.
490-53.Enclosures.
490-54.Collector Rings.
490-55.Power Cable Connections to Mobile Machines. <\/td>\n<\/tr>\n
310<\/td>\n490-56.High-Voltage Portable Cable for Main Power Supply.
E.Electrode-Type Boilers
490-70.General.
490-71.Electric Supply System.
490-72.Branch-Circuit Requirements.
490-73.Pressure and Temperature Limit Control.
490-74.Grounding. <\/td>\n<\/tr>\n
311<\/td>\nCHAPTER 5 Special Occupancies
Article 500 – Hazardous (Classified) Locations, Classes I, II, and III, Divisions 1 and 2
500-1.Scope – Articles 500 through 504.
500-2.Other Articles.
500-3.General. <\/td>\n<\/tr>\n
312<\/td>\n500-4.Protection Techniques. <\/td>\n<\/tr>\n
313<\/td>\n500-5.Special Precaution. <\/td>\n<\/tr>\n
315<\/td>\n500-6.Specific Occupancies. <\/td>\n<\/tr>\n
316<\/td>\n500-7.Class I Locations.
500-8.Class II Locations. <\/td>\n<\/tr>\n
317<\/td>\n500-9.Class III Locations.
Article 501 – Class I Locations
501-1.General.
501-2.Transformers and Capacitors. <\/td>\n<\/tr>\n
318<\/td>\n501-3.Meters, Instruments, and Relays.
501-4.Wiring Methods. <\/td>\n<\/tr>\n
319<\/td>\n501-5.Sealing and Drainage. <\/td>\n<\/tr>\n
322<\/td>\n501-6.Switches, Circuit Breakers, Motor Controllers, and Fuses. <\/td>\n<\/tr>\n
323<\/td>\n501-7.Control Transformers and Resistors.
501-8.Motors and Generators. <\/td>\n<\/tr>\n
324<\/td>\n501-9.Lighting Fixtures. <\/td>\n<\/tr>\n
325<\/td>\n501-10.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. <\/td>\n<\/tr>\n
326<\/td>\n501-15.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
502-1.General. <\/td>\n<\/tr>\n
327<\/td>\n502-2.Transformers and Capacitors.
502-4.Wiring Methods. <\/td>\n<\/tr>\n
328<\/td>\n502-5.Sealing, Class II, Divisions 1 and 2.
502-6.Switches, Circuit Breakers, Motor Controllers, and Fuses.
502-7.Control Transformers and Resistors. <\/td>\n<\/tr>\n
329<\/td>\n502-8.Motors and Generators.
502-9.Ventilating Piping.
502-10.Utilization Equipment. <\/td>\n<\/tr>\n
330<\/td>\n502-11.Lighting Fixtures.
502-12.Flexible Cords – Class II, Divisions 1 and 2.\u00c3\u008f <\/td>\n<\/tr>\n
331<\/td>\n502-13.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. <\/td>\n<\/tr>\n
332<\/td>\n502-17.Surge Protection – Class II, Divisions 1 and 2.\u00c3\u008f
502-18.Multiwire Branch Circuits.
Article 503 – Class III Locations
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. <\/td>\n<\/tr>\n
333<\/td>\n503-6.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. <\/td>\n<\/tr>\n
334<\/td>\n503-11.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. <\/td>\n<\/tr>\n
335<\/td>\nArticle 504 – Intrinsically Safe Systems
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. <\/td>\n<\/tr>\n
336<\/td>\n504-50.Grounding.
504-60.Bonding.
504-70.Sealing.
504-80.Identification. <\/td>\n<\/tr>\n
337<\/td>\nArticle 505 – Class I, Zone 0, 1, and 2 Locations
505-1.Scope.
505-2.Other Articles.
505-3.Location and General Requirements.
505-4.Protection Techniques. <\/td>\n<\/tr>\n
339<\/td>\n505-5.Reference Standards.
505-6.Special Precaution.
505-7.Grouping and Classification. <\/td>\n<\/tr>\n
340<\/td>\n505-8.Class I Temperature.
505-9.Zone Classification. <\/td>\n<\/tr>\n
341<\/td>\n505-10.Listing, Marking, and Documentation. <\/td>\n<\/tr>\n
343<\/td>\n505-15.Wiring Methods. <\/td>\n<\/tr>\n
344<\/td>\n505-20.Equipment.
505-21.Increased Safety “e” Motors and Generators.
505-25.Grounding and Bonding.
Article 510 – Hazardous (Classified) Locations – Specific
510-1.Scope.
510-2.General. <\/td>\n<\/tr>\n
345<\/td>\nArticle 511 – Commercial Garages, Repair and Storage
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. <\/td>\n<\/tr>\n
346<\/td>\n511-7.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
513-1.Scope.
513-2.Definitions. <\/td>\n<\/tr>\n
347<\/td>\n513-3.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. <\/td>\n<\/tr>\n
348<\/td>\n513-8.Sealing.
513-9.Aircraft Electrical Systems.
513-10.Aircraft Batteries – Charging and Equipment.\u00c3\u008f
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
514-1.Definition. <\/td>\n<\/tr>\n
349<\/td>\n514-2.Class I Locations. <\/td>\n<\/tr>\n
351<\/td>\n514-3.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. <\/td>\n<\/tr>\n
352<\/td>\n514-16.Grounding.
Article 515 – Bulk Storage Plants
515-1.Definition.
515-2.Class I Locations. <\/td>\n<\/tr>\n
354<\/td>\n515-3.Wiring and Equipment Within Class I Locations.
515-4.Wiring and Equipment Above Class I Locations.
515-5.Underground Wiring. <\/td>\n<\/tr>\n
355<\/td>\n515-6.Sealing.
515-7.Gasoline Dispensing.
515-16.Grounding.
Article 516 – Spray Application, Dipping, and Coating Processes
516-1.Scope. <\/td>\n<\/tr>\n
356<\/td>\n516-2.Classification of Locations. <\/td>\n<\/tr>\n
357<\/td>\n516-3.Wiring and Equipment in Class I Locations. <\/td>\n<\/tr>\n
358<\/td>\n516-4.Fixed Electrostatic Equipment. <\/td>\n<\/tr>\n
359<\/td>\n516-5.Electrostatic Hand-Spraying Equipment. <\/td>\n<\/tr>\n
360<\/td>\n516-6.Powder Coating. <\/td>\n<\/tr>\n
361<\/td>\n516-7.Wiring and Equipment Above Class I and II Locations.
516-16.Grounding.
Article 517 – Health Care Facilities
A.General
517-1.Scope.
517-2.General.
517-3.Definitions. <\/td>\n<\/tr>\n
363<\/td>\nB.Wiring and Protection
517-10.Applicability.
517-11.General Installation – Construction Criteria. <\/td>\n<\/tr>\n
364<\/td>\n517-12.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. <\/td>\n<\/tr>\n
365<\/td>\n517-19.Critical Care Areas. <\/td>\n<\/tr>\n
366<\/td>\n517-20.Wet Locations.
517-21.Ground-Fault Circuit-Interrupter Protection for Personnel.
C.Essential Electrical System
517-25.Scope.
517-30.Essential Electrical Systems for Hospitals. <\/td>\n<\/tr>\n
368<\/td>\n517-31.Emergency System.
517-32.Life Safety Branch. <\/td>\n<\/tr>\n
369<\/td>\n517-33.Critical Branch.
517-34.Equipment System Connection to Alternate Power Source. <\/td>\n<\/tr>\n
370<\/td>\n517-35.Sources of Power. <\/td>\n<\/tr>\n
371<\/td>\n517-40.Essential Electrical Systems for Nursing Homes and Limited Care Facilities
517-41.Essential Electrical Systems. <\/td>\n<\/tr>\n
372<\/td>\n517-42.Automatic Connection to Life Safety Branch. <\/td>\n<\/tr>\n
373<\/td>\n517-43.Connection to Critical Branch.
517-44.Sources of Power. <\/td>\n<\/tr>\n
374<\/td>\n517-45.Essential Electrical Systems for Ambulatory Health Care Centers.
517-50.Essential Electrical Systems for Clinics, Medical and Dental Offices, and
D.Inhalation Anesthetizing Locations
517-60.Anesthetizing Location Classification. <\/td>\n<\/tr>\n
375<\/td>\n517-61.Wiring and Equipment. <\/td>\n<\/tr>\n
376<\/td>\n517-62.Grounding.
517-63.Grounded Power Systems in Anesthetizing Locations.
517-64.Low-Voltage Equipment and Instruments. <\/td>\n<\/tr>\n
377<\/td>\nE.X-Ray Installations
517-71.Connection to Supply Circuit.
517-72.Disconnecting Means.
517-73.Rating of Supply Conductors and Overcurrent Protection. <\/td>\n<\/tr>\n
378<\/td>\n517-74.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
517-80.Patient Care Areas.
517-81.Other-than-Patient-Care Areas.
517-82.Signal Transmission Between Appliances. <\/td>\n<\/tr>\n
379<\/td>\nG.Isolated Power Systems
517-160.Isolated Power Systems. <\/td>\n<\/tr>\n
380<\/td>\nArticle 518 – Places of Assembly
518-1.Scope.
518-2.General Classifications.
518-3.Other Articles.
518-4.Wiring Methods. <\/td>\n<\/tr>\n
381<\/td>\n518-5.Supply.
Article 520 – Theaters, Audience Areas of Motion Picture and Television Studios
A.General
520-1.Scope.
520-2.Definitions. <\/td>\n<\/tr>\n
382<\/td>\n520-3.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
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. <\/td>\n<\/tr>\n
383<\/td>\n520-26.Type of Switchboard.
520-27.Stage Switchboard Feeders.
C.Fixed Stage Equipment Other than Switchboards
520-41.Circuit Loads. <\/td>\n<\/tr>\n
384<\/td>\n520-42.Conductor Insulation.
520-43.Footlights.
520-44.Borders and Proscenium Sidelights.
520-45.Receptacles. <\/td>\n<\/tr>\n
385<\/td>\n520-46.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
520-50.Road Show Connection Panel (A Type of Patch Panel).
520-51.Supply.
520-52.Overcurrent Protection.
520-53.Construction and Feeders. <\/td>\n<\/tr>\n
388<\/td>\nE.Portable Stage Equipment Other than Switchboards
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. <\/td>\n<\/tr>\n
389<\/td>\n520-69.Adapters.
F.Dressing Rooms
520-71.Pendant Lampholders.
520-72.Lamp Guards.
520-73.Switches Required.
G.Grounding
520-81.Grounding.
Article 525 – Carnivals, Circuses, Fairs, and Similar Events
A.General Requirements
525-1.Scope.
525-3.Other Articles. <\/td>\n<\/tr>\n
390<\/td>\n525-6.Protection of Electrical Equipment.
B.Installation
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. <\/td>\n<\/tr>\n
391<\/td>\n525-16.Overcurrent Protection.
525-17.Motors.
525-18.Ground-Fault Circuit-Interrupter Protection for Personnel.
C.Grounding and Bonding
525-20.General.
525-21.Equipment.
525-22.Equipment Grounding Conductor.
D.Disconnecting Means
525-30.Type and Location.
E.Attractions Utilizing Pools, Fountains, and Similar Installations with Contain
525-40.Wiring and Equipment.
Article 530 – Motion Picture and Television Studios and Similar Locations
A.General
530-1.Scope. <\/td>\n<\/tr>\n
392<\/td>\n530-2.Definitions.
530-6.Portable Equipment.
B.Stage or Set
530-11.Permanent Wiring.
530-12.Portable Wiring. <\/td>\n<\/tr>\n
393<\/td>\n530-13.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. <\/td>\n<\/tr>\n
394<\/td>\n530-19.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. <\/td>\n<\/tr>\n
395<\/td>\nC.Dressing Rooms
530-31.Dressing Rooms.
D.Viewing, Cutting, and Patching Tables
530-41.Lamps at Tables.
E.Cellulose Nitrate Film Storage Vaults
530-51.Lamps in Cellulose Nitrate Film Storage Vaults.
530-52.Motors and Other Equipment in Cellulose Nitrate Film Storage Vaults.
F.Substations
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
530-70.General.
530-71.Wiring Methods.
530-72.Grounding. <\/td>\n<\/tr>\n
396<\/td>\n530-73.Receptacles.
Article 540 – Motion Picture Projectors
A.General
540-1.Scope.
B.Definitions
540-2.Professional Projector.
540-3.Nonprofessional Projector.
C.Equipment and Projectors of the Professional Type
540-10.Motion Picture Projection Room Required.
540-11.Location of Associated Electrical Equipment. <\/td>\n<\/tr>\n
397<\/td>\n540-12.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
540-31.Motion Picture Room Not Required.
540-32.Approval.
E.Audio Signal Processing, Amplification, and Reproduction Equipment
540-50.Audio Signal Processing, Amplification, and Reproduction Equipment.
Article 545 – Manufactured Buildings
A.General
545-1.Scope.
545-2.Other Articles. <\/td>\n<\/tr>\n
398<\/td>\n545-3.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
547-1.Scope. <\/td>\n<\/tr>\n
399<\/td>\n547-2.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 <\/td>\n<\/tr>\n
400<\/td>\n547-9.Bonding and Equipotential Plane.
Article 550 – Mobile Homes, Manufactured Homes, and Mobile Home Parks
A.General
550-1.Scope.
550-2.Definitions. <\/td>\n<\/tr>\n
401<\/td>\n550-3.Other Articles.
550-4.General Requirements.
B.Mobile Homes
550-5.Power Supply. <\/td>\n<\/tr>\n
402<\/td>\n550-6.Disconnecting Means and Branch-Circuit Protective Equipment. <\/td>\n<\/tr>\n
403<\/td>\n550-7.Branch Circuits. <\/td>\n<\/tr>\n
404<\/td>\n550-8.Receptacle Outlets. <\/td>\n<\/tr>\n
405<\/td>\n550-9.Fixtures and Appliances.
550-10.Wiring Methods and Materials. <\/td>\n<\/tr>\n
406<\/td>\n550-11.Grounding.
550-12.Testing. <\/td>\n<\/tr>\n
407<\/td>\n550-13.Calculations.
550-14.Interconnection of Multiple Section Mobile Home Units.
550-15.Outdoor Outlets, Fixtures, Air-Cooling Equipment, etc. <\/td>\n<\/tr>\n
408<\/td>\nC.Services and Feeders
550-21.Distribution System.
550-22.Minimum Allowable Demand Factors.
550-23.Service Equipment. <\/td>\n<\/tr>\n
409<\/td>\n550-24.Feeder.
Article 551 – Recreational Vehicles and Recreational Vehicle Parks
A.General
551-1.Scope.
551-2.Definitions. <\/td>\n<\/tr>\n
410<\/td>\n551-3.Other Articles.
551-4.General Requirements.
B.Low-Voltage Systems
551-10.Low-Voltage Systems. <\/td>\n<\/tr>\n
412<\/td>\nC.Combination Electrical Systems
551-20.Combination Electrical Systems.
D.Other Power Sources
551-30.Generator Installations. <\/td>\n<\/tr>\n
413<\/td>\n551-31.Multiple Supply Source.
551-32.Other Sources.
551-33.Alternate Source Restriction.
E.Nominal 120-Volt or 120\/240-Volt Systems
551-40.120-Volt or 120\/240-Volt, Nominal, Systems. <\/td>\n<\/tr>\n
414<\/td>\n551-41.Receptacle Outlets Required.
551-42.Branch Circuits Required. <\/td>\n<\/tr>\n
415<\/td>\n551-43.Branch-Circuit Protection.
551-44.Power-Supply Assembly.
551-45.Distribution Panelboard.
551-46.Means for Connecting to Power Supply. <\/td>\n<\/tr>\n
417<\/td>\n551-47.Wiring Methods. <\/td>\n<\/tr>\n
418<\/td>\n551-48.Conductors and Boxes.
551-49.Grounded Conductors.
551-50.Connection of Terminals and Splices.
551-51.Switches.
551-52.Receptacles.
551-53.Lighting Fixtures. <\/td>\n<\/tr>\n
419<\/td>\n551-54.Grounding.
551-55.Interior Equipment Grounding.
551-56.Bonding of Noncurrent-Carrying Metal Parts. <\/td>\n<\/tr>\n
420<\/td>\n551-57.Appliance Accessibility and Fastening.
F.Factory Tests
551-60.Factory Tests (Electrical).
G.Recreational Vehicle Parks
551-71.Type Receptacles Provided.
551-72.Distribution System.
551-73.Calculated Load. <\/td>\n<\/tr>\n
421<\/td>\n551-74.Overcurrent Protection.
551-75.Grounding.
551-76.Grounding – Recreational Vehicle Site Supply Equipment.
551-77.Recreational Vehicle Site Supply Equipment. <\/td>\n<\/tr>\n
422<\/td>\n551-78.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
A.General
552-1.Scope.
552-2.Definitions. <\/td>\n<\/tr>\n
423<\/td>\n552-3.Other Articles.
552-4.General Requirements.
B.Low-Voltage Systems
552-10.Low-Voltage Systems. <\/td>\n<\/tr>\n
424<\/td>\nC.Combination Electrical Systems
552-20.Combination Electrical Systems. <\/td>\n<\/tr>\n
425<\/td>\nD.Nominal 120-Volt or 120\/240-Volt Systems
552-40.120-Volt or 120\/240-Volt, Nominal, Systems.
552-41.Receptacle Outlets Required.
552-43.Power Supply. <\/td>\n<\/tr>\n
426<\/td>\n552-44.Cord. <\/td>\n<\/tr>\n
427<\/td>\n552-45.Distribution Panelboard.
552-46.Branch Circuits. <\/td>\n<\/tr>\n
428<\/td>\n552-47.Calculations.
552-48.Wiring Methods. <\/td>\n<\/tr>\n
429<\/td>\n552-49.Conductors and Boxes. <\/td>\n<\/tr>\n
430<\/td>\n552-50.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. <\/td>\n<\/tr>\n
431<\/td>\n552-57.Bonding of Noncurrent-Carrying Metal Parts.
552-58.Appliance Accessibility and Fastening.
552-59.Outdoor Outlets, Fixtures, Air-Cooling Equipment, etc.
E.Factory Tests
552-60.Factory Tests (Electrical). <\/td>\n<\/tr>\n
432<\/td>\nArticle 553 – Floating Buildings
A.General
553-1.Scope.
553-2.Definition.
553-3.Application of Other Articles.
B.Services and Feeders
553-4.Location of Service Equipment.
553-5.Service Conductors.
553-6.Feeder Conductors.
553-7.Installation of Services and Feeders.
C.Grounding
553-8.General Requirements.
553-9.Insulated Neutral.
553-10.Equipment Grounding. <\/td>\n<\/tr>\n
433<\/td>\n553-11.Bonding of Noncurent-Carrying Metal Parts.
Article 555 – Marinas and Boatyards
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. <\/td>\n<\/tr>\n
434<\/td>\n555-8.Grounding.
555-9.Wiring Over and Under Navigable Water.
555-10.Gasoline Dispensing Stations – Hazardous (Classified) Locations.
555-11.Location of Service Equipment. <\/td>\n<\/tr>\n
435<\/td>\nCHAPTER 6 Special Equipment
Article 600 – Electric Signs and Outline Lighting
A.General
600-1.Scope.
600-2.Definitions.
600-3.Listing.
600-4.Markings.
600-5.Branch Circuits.
600-6.Disconnects. <\/td>\n<\/tr>\n
436<\/td>\n600-7.Grounding.
600-8.Enclosures.
600-9.Location.
600-10.Portable or Mobile Signs. <\/td>\n<\/tr>\n
437<\/td>\n600-21.Ballasts, Transformers, and Electronic Power Supplies.
600-22.Ballasts.
600-23.Transformers and Electronic Power Supplies.
B.Field-Installed Skeleton Tubing
600-30.Applicability.
600-31.Neon Secondary-Circuit Conductors, 1000 Volts or Less, Nominal. <\/td>\n<\/tr>\n
438<\/td>\n600-32.Neon Secondary Circuit Conductors, Over 1000 Volts, Nominal.
600-41.Neon Tubing.
600-42.Electrode Connections. <\/td>\n<\/tr>\n
439<\/td>\nArticle 604 – Manufactured Wiring Systems
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)
605-1.Scope.
605-2.General.
605-3.Wireways. <\/td>\n<\/tr>\n
440<\/td>\n605-4.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
A.General
610-1.Scope.
610-2.Special Requirements for Particular Locations. <\/td>\n<\/tr>\n
441<\/td>\nB.Wiring
610-11.Wiring Method.
610-12.Raceway or Cable Terminal Fittings.
610-13.Types of Conductors.
610-14.Rating and Size of Conductors. <\/td>\n<\/tr>\n
443<\/td>\n610-15.Common Return.
C.Contact Conductors
610-21.Installation of Contact Conductors. <\/td>\n<\/tr>\n
444<\/td>\n610-22.Collectors.
D.Disconnecting Means
610-31.Runway Conductor Disconnecting Means.
610-32.Disconnecting Means for Cranes and Monorail Hoists.
610-33.Rating of Disconnecting Means.
E.Overcurrent Protection
610-41.Feeders, Runway Conductors.
610-42.Branch-Circuit Short-Circuit and Ground-Fault Protection. <\/td>\n<\/tr>\n
445<\/td>\n610-43.Overload Protection.
F.Control
610-51.Separate Controllers.
610-53.Overcurrent Protection.
610-55.Limit Switch.
610-57.Clearance.
G.Grounding
610-61.Grounding. <\/td>\n<\/tr>\n
446<\/td>\nArticle 620 – Elevators, Dumbwaiters, Escalators, Moving Walks, Wheelchair Lifts
A.General
620-1.Scope.
620-2.Definitions. <\/td>\n<\/tr>\n
447<\/td>\n620-3.Voltage Limitations.
620-4.Live Parts Enclosed.
620-5.Working Clearances.
B.Conductors
620-11.Insulation of Conductors. <\/td>\n<\/tr>\n
448<\/td>\n620-12.Minimum Size of Conductors.
620-13.Feeder and Branch-Circuit Conductors.
620-14.Feeder Demand Factor.
620-15.Motor Controller Rating.
C.Wiring
620-21.Wiring Methods. <\/td>\n<\/tr>\n
450<\/td>\n620-22.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
620-32.Metal Wireways and Nonmetallic Wireways.
620-33.Number of Conductors in Raceways. <\/td>\n<\/tr>\n
451<\/td>\n620-34.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
620-41.Suspension of Traveling Cables.
620-42.Hazardous (Classified) Locations.
620-43.Location of and Protection for Cables. <\/td>\n<\/tr>\n
452<\/td>\n620-44.Installation of Traveling Cables.
F.Disconnecting Means and Control
620-51.Disconnecting Means.
620-52.Power from More than One Source. <\/td>\n<\/tr>\n
453<\/td>\n620-53.Car Light, Receptacle(s), and Ventilation Disconnecting Means.
620-54.Heating and Air-Conditioning Disconnecting Means.
G.Overcurrent Protection
620-61.Overcurrent Protection.
620-62.Selective Coordination.
H.Machine Room
620-71.Guarding Equipment. <\/td>\n<\/tr>\n
454<\/td>\nJ.Grounding
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
620-91.Emergency and Standby Power Systems.
Article 625 – Electric Vehicle Charging System
A.General
625-1.Scope.
625-2.Definitions. <\/td>\n<\/tr>\n
455<\/td>\n625-3.Other Articles.
625-4.Voltages.
625-5.Listed or Labeled.
B.Wiring Methods
625-9.Electric Vehicle Coupler.
C.Equipment Construction
625-13.Electric Vehicle Supply Equipment.
625-14.Rating.
625-15.Markings. <\/td>\n<\/tr>\n
456<\/td>\n625-16.Means of Coupling.
625-17.Cable.
625-18.Interlock.
625-19.Automatic De-energization of Cable.
D.Control and Protection
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
625-28.Hazardous (Classified) Locations.
625-29.Indoor Sites. <\/td>\n<\/tr>\n
457<\/td>\n625-30.Outdoor Sites.
Article 630 – Electric Welders
A.General
630-1.Scope.
B.Arc Welders
630-11.Ampacity of Supply Conductors. <\/td>\n<\/tr>\n
458<\/td>\n630-12.Overcurrent Protection.
630-13.Disconnecting Means.
630-14.Marking.
C.Resistance Welders
630-31.Ampacity of Supply Conductors. <\/td>\n<\/tr>\n
459<\/td>\n630-32.Overcurrent Protection.
630-33.Disconnecting Means.
630-34.Marking.
D.Welding Cable
630-41.Conductors.
630-42.Installation. <\/td>\n<\/tr>\n
460<\/td>\nArticle 640 – Audio Signal Processing, Amplification, and Reproduction Equipment
A.General
640-1.Scope.
640-2.Definitions. <\/td>\n<\/tr>\n
461<\/td>\n640-3.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. <\/td>\n<\/tr>\n
462<\/td>\n640-8.Grouping of Conductors.
640-9.Wiring Methods.
640-10.Audio Systems Near Bodies of Water. <\/td>\n<\/tr>\n
463<\/td>\nB.Permanent Audio System Installations
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 <\/td>\n<\/tr>\n
464<\/td>\nC.Portable and Temporary Audio System Installations
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. <\/td>\n<\/tr>\n
465<\/td>\n640-46.Equipment Access.
Article 645 – Information Technology Equipment
645-1.Scope.
645-2.Special Requirements for Information Technology Equipment Room.
645-5.Supply Circuits and Interconnecting Cables. <\/td>\n<\/tr>\n
466<\/td>\n645-6.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
650-1.Scope. <\/td>\n<\/tr>\n
467<\/td>\n650-2.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
A.General
660-1.Scope.
660-2.Definitions.
660-3.Hazardous (Classified) Locations.
660-4.Connection to Supply Circuit. <\/td>\n<\/tr>\n
468<\/td>\n660-5.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
660-20.Fixed and Stationary Equipment.
660-21.Portable and Mobile Equipment.
660-23.Industrial and Commercial Laboratory Equipment.
660-24.Independent Control. <\/td>\n<\/tr>\n
469<\/td>\nC.Transformers and Capacitors
660-35.General.
660-36.Capacitors.
D.Guarding and Grounding
660-47.General.
660-48.Grounding.
Article 665 – Induction and Dielectric Heating
A.General
665-1.Scope.
665-2.Definitions.
665-3.Other Articles.
665-4.Hazardous (Classified) Locations.
B.Guarding, Grounding, and Labeling
665-20.Enclosures.
665-21.Panel Controls.
665-22.Access to Internal Equipment.
665-23.Warning Labels or Signs. <\/td>\n<\/tr>\n
470<\/td>\n665-24.Capacitors.
665-25.Work Applicator Shielding.
665-26.Grounding and Bonding.
665-27.Marking.
665-28.Control Enclosures.
C.Motor-Generator Equipment
665-40.General.
665-41.Ampacity of Supply Conductors.
665-42.Overcurrent Protection.
665-43.Disconnecting Means.
665-44.Output Circuit. <\/td>\n<\/tr>\n
471<\/td>\n665-47.Remote Control.
D.Equipment Other than Motor-Generators
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
668-1.Scope. <\/td>\n<\/tr>\n
472<\/td>\n668-2.Definitions.
668-3.Other Articles.
668-10.Cell Line Working Zone. <\/td>\n<\/tr>\n
473<\/td>\n668-11.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. <\/td>\n<\/tr>\n
474<\/td>\n668-30.Fixed and Portable Electrical Equipment.
668-31.Auxiliary Nonelectric Connections.
668-32.Cranes and Hoists.
668-40.Enclosures.
Article 669 – Electroplating
669-1.Scope.
669-2.Other Articles.
669-3.General.
669-5.Branch-Circuit Conductors.
669-6.Wiring Methods. <\/td>\n<\/tr>\n
475<\/td>\n669-7.Warning Signs.
669-8.Disconnecting Means.
669-9.Overcurrent Protection.
Article 670 – Industrial Machinery
670-1.Scope.
670-2.Definitions.
670-3.Machine Nameplate Data.
670-4.Supply Conductors and Overcurrent Protection. <\/td>\n<\/tr>\n
476<\/td>\n670-5.Clearance.
Article 675 – Electrically Driven or Controlled Irrigation Machines
A.General
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. <\/td>\n<\/tr>\n
477<\/td>\n675-7.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. <\/td>\n<\/tr>\n
478<\/td>\n675-13.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
675-21.General.
675-22.Equivalent Current Ratings.
Article 680 – Swimming Pools, Fountains, and Similar Installations
A.General
680-1.Scope.
680-2.Approval of Equipment.
680-3.Other articles.
680-4.Definitions. <\/td>\n<\/tr>\n
479<\/td>\n680-5.Transformers and Ground-Fault Circuit Interrupters. <\/td>\n<\/tr>\n
480<\/td>\n680-6.Receptacles, Lighting Fixtures, Lighting Outlets, Switching Devices, and C
680-7.Cord- and Plug-Connected Equipment.
680-8.Overhead Conductor Clearances. <\/td>\n<\/tr>\n
481<\/td>\n680-9.Electric Pool Water Heaters.
680-10.Underground Wiring Location.
680-11.Equipment Rooms and Pits.
680-12.Disconnecting Means. <\/td>\n<\/tr>\n
482<\/td>\nB.Permanently Installed Pools
680-20.Underwater Lighting Fixtures. <\/td>\n<\/tr>\n
483<\/td>\n680-21.Junction Boxes and Enclosures for Transformers or Ground-Fault Circuit Interrupters.
680-22.Bonding. <\/td>\n<\/tr>\n
484<\/td>\n680-23.Underwater Audio Equipment.
680-24.Grounding.
680-25.Methods of Grounding. <\/td>\n<\/tr>\n
486<\/td>\n680-26.Electrically Operated Pool Covers.
680-27.Deck Area Heating.
680-28.Double Insulated Pool Pumps.
C.Storable Pools
680-30.Pumps.
680-31.Ground-Fault Circuit Interrupters Required.
680-32.Lighting Fixtures. <\/td>\n<\/tr>\n
487<\/td>\nD.Spas and Hot Tubs
680-38.Emergency Switch for Spas and Hot Tubs.
680-40.Outdoor Installations.
680-41.Indoor Installations. <\/td>\n<\/tr>\n
488<\/td>\n680-42.Protection.
E.Fountains
680-50.General.
680-51.Lighting Fixtures, Submersible Pumps, and Other Submersible Equipment. <\/td>\n<\/tr>\n
489<\/td>\n680-52.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
680-60.General.
680-61.Permanently Installed Therapeutic Pools. <\/td>\n<\/tr>\n
490<\/td>\n680-62.Therapeutic Tubs (Hydrotherapeutic Tanks).
G.Hydromassage Bathtubs
680-70.Protection.
680-71.Other Electrical Equipment.
680-72.Accessibility. <\/td>\n<\/tr>\n
491<\/td>\n680-73.Bonding.
Article 685 – Integrated Electrical Systems
A.General
685-1.Scope.
685-2.Application of Other Articles.
B.Orderly Shutdown
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
A.General
690-1.Scope.
690-2.Definitions. <\/td>\n<\/tr>\n
493<\/td>\n690-3.Other Articles.
690-4.Installation.
690-5.Ground-Fault Protection.
690-6.Alternating-Current Modules. <\/td>\n<\/tr>\n
494<\/td>\nB.Circuit Requirements
690-7.Maximum Voltage.
690-8.Circuit Sizing and Current.
690-9.Overcurrent Protection. <\/td>\n<\/tr>\n
495<\/td>\n690-10.Stand-Alone Systems.
C.Disconnecting Means
690-13.All Conductors.
690-14.Additional Provisions.
690-15.Disconnection of Photovoltaic Equipment. <\/td>\n<\/tr>\n
496<\/td>\n690-16.Fuses.
690-17.Switch or Circuit Breaker.
690-18.Installation and Service of an Array.
D.Wiring Methods
690-31.Methods Permitted.
690-32.Component Interconnections.
690-33.Connectors. <\/td>\n<\/tr>\n
497<\/td>\n690-34.Access to Boxes.
E.Grounding
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
690-51.Modules.
690-52.Alternating-Current Photovoltaic Modules.
690-53.Photovoltaic Power Source. <\/td>\n<\/tr>\n
498<\/td>\n690-54.Interactive System Point of Interconnection.
G.Connection to Other Sources
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
690-71.Installation. <\/td>\n<\/tr>\n
499<\/td>\n690-72.Charge Control.
690-74.Battery Interconnections.
I.Systems Over 600 Volts
690-80.General.
690-85.Definitions.
Article 695 – Fire Pumps
695-1.Scope.
695-2.Application of Other Articles.
695-3.Power Source(s) for Electric Motor-Driven Fire Pumps. <\/td>\n<\/tr>\n
500<\/td>\n695-4.Continuity of Power. <\/td>\n<\/tr>\n
501<\/td>\n695-5.Transformers.
695-6.Power Wiring. <\/td>\n<\/tr>\n
502<\/td>\n695-7.Voltage Drop.
695-10.Listed Equipment.
695-12.Equipment Location.
695-14.Control Wiring. <\/td>\n<\/tr>\n
503<\/td>\nCHAPTER 7 Special Conditions
Article 700 – Emergency Systems
A.General
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. <\/td>\n<\/tr>\n
504<\/td>\n700-7.Signals.
700-8.Signs.
B.Circuit Wiring
700-9.Wiring, Emergency System. <\/td>\n<\/tr>\n
505<\/td>\nC.Sources of Power
700-12.General Requirements. <\/td>\n<\/tr>\n
506<\/td>\nD.Emergency System Circuits for Lighting and Power
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
700-20.Switch Requirements. <\/td>\n<\/tr>\n
507<\/td>\n700-21.Switch Location.
700-22.Exterior Lights.
F.Overcurrent Protection
700-25.Accessibility.
700-26.Ground-Fault Protection of Equipment.
Article 701 – Legally Required Standby Systems
A.General
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. <\/td>\n<\/tr>\n
508<\/td>\n701-6.Capacity and Rating.
701-7.Transfer Equipment.
701-8.Signals.
701-9.Signs.
B.Circuit Wiring
701-10.Wiring Legally Required Standby Systems.
C.Sources of Power
701-11.Legally Required Standby Systems. <\/td>\n<\/tr>\n
509<\/td>\nD.Overcurrent Protection
701-15.Accessibility.
701-17.Ground-Fault Protection of Equipment.
Article 702 – Optional Standby Systems
A.General
702-1.Scope. <\/td>\n<\/tr>\n
510<\/td>\n702-2.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
702-9.Wiring Optional Standby Systems.
Article 705 – Interconnected Electric Power Production Sources
705-1.Scope.
705-2.Definition.
705-3.Other Articles.
705-10.Directory. <\/td>\n<\/tr>\n
511<\/td>\n705-12.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. <\/td>\n<\/tr>\n
512<\/td>\n705-42.Unbalanced Interconnections.
705-43.Synchronous Generators.
705-50.Grounding.
Article 720 – Circuits and Equipment Operating at Less than 50 Volts
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
A.General
725-1.Scope.
725-2.Definitions. <\/td>\n<\/tr>\n
513<\/td>\n725-3.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
725-21.Class 1 Circuit Classifications and Power Source Requirements. <\/td>\n<\/tr>\n
514<\/td>\n725-23.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. <\/td>\n<\/tr>\n
515<\/td>\n725-27.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
725-41.Power Sources for Class 2 and Class 3 Circuits. <\/td>\n<\/tr>\n
516<\/td>\n725-51.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. <\/td>\n<\/tr>\n
518<\/td>\n725-61.Applications of Listed Class 2, Class 3, and PLTC Cables. <\/td>\n<\/tr>\n
519<\/td>\n725-71.Listing and Marking of Class 2, Class 3, and Type PLTC Cables. <\/td>\n<\/tr>\n
520<\/td>\nArticle 727 – Instrumentation Tray Cable: Type ITC
727-1.Scope.
727-2.Definition.
727-3.Other Articles.
727-4.Uses Permitted. <\/td>\n<\/tr>\n
521<\/td>\n727-5.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
A.General
760-1.Scope.
760-2.Definitions.
760-3.Locations and Other Articles. <\/td>\n<\/tr>\n
522<\/td>\n760-5.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
760-21.NPLFA Circuit Power Source Requirements.
760-23.NPLFA Circuit Overcurrent Protection.
760-24.NPLFA Circuit Overcurrent Device Location.\u00c3\u008f <\/td>\n<\/tr>\n
523<\/td>\n760-25.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. <\/td>\n<\/tr>\n
524<\/td>\n760-31.Listing and Marking of NPLFA Cables. <\/td>\n<\/tr>\n
525<\/td>\nC.Power-Limited Fire Alarm (PLFA) Circuits
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. <\/td>\n<\/tr>\n
526<\/td>\n760-54.Installation of Conductors and Equipment. <\/td>\n<\/tr>\n
527<\/td>\n760-55.Current-Carrying Continuous Line-Type Fire Detectors.
760-61.Applications of Listed PLFA Cables. <\/td>\n<\/tr>\n
528<\/td>\n760-71.Listing and Marking of PLFA Cables and Insu\u00c3\u008dlated Continuous Line-Type Fire Detectors. <\/td>\n<\/tr>\n
529<\/td>\nArticle 770 – Optical Fiber Cables and Raceways
A.General
770-1.Scope.
770-2.Definitions.
770-3.Locations and Other Articles.
770-4.Optical Fiber Cables.
770-5.Types. <\/td>\n<\/tr>\n
530<\/td>\n770-6.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
770-33.Grounding of Entrance Cables.
C.Cables Within Buildings
770-49.Fire Resistance of Optical Fiber Cables.
770-50.Listing, Marking, and Installation of Optical Fiber Cables. <\/td>\n<\/tr>\n
531<\/td>\n770-51.Listing Requirements for Optical Fiber Cables and Raceways.
770-52.Installation of Optical Fibers and Electrical Conductors. <\/td>\n<\/tr>\n
532<\/td>\n770-53.Applications of Listed Optical Fiber Cables and Raceways. <\/td>\n<\/tr>\n
533<\/td>\nArticle 780 – Closed-Loop and Programmed Power Distribution
780-1.Scope.
780-2.General.
780-3.Control.
780-5.Power Limitation in Signaling Circuits.
780-6.Cables and Conductors.
780-7.Noninterchangeability. <\/td>\n<\/tr>\n
534<\/td>\nCHAPTER 8 Communications Systems
Article 800 – Communications Circuits
A.General
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
800-10.Overhead Communications Wires and Cables. <\/td>\n<\/tr>\n
535<\/td>\n800-11.Underground Circuits Entering Buildings.
800-12.Circuits Requiring Primary Protectors. <\/td>\n<\/tr>\n
536<\/td>\n800-13.Lightning Conductors.
C.Protection
800-30.Protective Devices. <\/td>\n<\/tr>\n
537<\/td>\n800-31.Primary Protector Requirements.
800-32.Secondary Protector Requirements.
800-33.Cable Grounding.
D.Grounding Methods
800-40.Cable and Primary Protector Grounding. <\/td>\n<\/tr>\n
538<\/td>\n800-41.Primary Protector Grounding and Bonding at Mobile Homes.
E.Communications Wires and Cables Within Buildings
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. <\/td>\n<\/tr>\n
539<\/td>\n800-51.Listing Requirements for Communications Wires and Cables and Communications Raceways. <\/td>\n<\/tr>\n
540<\/td>\n800-52.Installation of Communications Wires, Cables, and Equipment. <\/td>\n<\/tr>\n
541<\/td>\n800-53.Applications of Listed Communications Wires and Cables, and Communications Raceways. <\/td>\n<\/tr>\n
542<\/td>\nArticle 810 – Radio and Television Equipment
A.General
810-1.Scope.
810-2.Other Articles.
810-3.Community Television Antenna.
810-4.Radio Noise Suppressors.
810-5.Definitions. <\/td>\n<\/tr>\n
543<\/td>\nB.Receiving Equipment – Antenna Systems
810-11.Material.
810-12.Supports.
810-13.Avoidance of Contacts with Conductors of Other Systems.
810-14.Splices.
810-15.Grounding.
810-16.Size of Wire-Strung Antenna – Receiving Station.
810-17.Size of Lead-in – Receiving Station.
810-18.Clearances – Receiving Stations. <\/td>\n<\/tr>\n
544<\/td>\n810-19.Electric Supply Circuits Used in Lieu of Antenna – Receiving Stations.
810-20.Antenna Discharge Units – Receiving Stations.
810-21.Grounding Conductors Receiving Stations. <\/td>\n<\/tr>\n
545<\/td>\nC.Amateur Transmitting and Receiving Stations – Antenna Systems
810-51.Other Sections.
810-52.Size of Antenna.
810-53.Size of Lead-in Conductors.
810-54.Clearance on Building.
810-55.Entrance to Building.
810-56.Protection Against Accidental Contact.
810-57.Antenna Discharge Units – Transmitting \u00c3\u008dStations.
810-58.Grounding Conductors – Amateur Transmitting and Receiving Stations.
D.Interior Installation – Transmitting Stations
810-70.Clearance from Other Conductors. <\/td>\n<\/tr>\n
546<\/td>\n810-71.General.
Article 820 – Community Antenna Television and Radio Distribution Systems
A.General
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
820-10.Outside Cables. <\/td>\n<\/tr>\n
547<\/td>\n820-11.Entering Buildings.
C.Protection
820-33.Grounding of Outer Conductive Shield of a Coaxial Cable. <\/td>\n<\/tr>\n
548<\/td>\nD.Grounding Methods
820-40.Cable Grounding.
820-41.Equipment Grounding.
820-42.Bonding and Grounding at Mobile Homes. <\/td>\n<\/tr>\n
549<\/td>\nE.Cables Within Buildings
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. <\/td>\n<\/tr>\n
550<\/td>\n820-53.Applications of Listed CATV Cables. <\/td>\n<\/tr>\n
551<\/td>\nArticle 830 – Network-Powered Broadband Communications Systems
A.General
830-1.Scope.
830-2.Definitions. <\/td>\n<\/tr>\n
552<\/td>\n830-3.Locations and Other Articles.
830-4.Power Limitations.
830-5.Network-Powered Broadband Communications Equipment and Cables. <\/td>\n<\/tr>\n
553<\/td>\n830-6.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
830-9.Entrance Cables.
830-10.Aerial Cables. <\/td>\n<\/tr>\n
555<\/td>\n830-11.Underground Circuits Entering Buildings.
C.Protection
830-30.Primary Electrical Protection. <\/td>\n<\/tr>\n
557<\/td>\n830-33.Grounding or Interruption of Metallic Members of Network-Powered Broadband Communications Cables.
D.Grounding Methods
830-40.Cable, Network Interface Unit, and Primary Protector Grounding. <\/td>\n<\/tr>\n
558<\/td>\n830-42.Bonding and Grounding at Mobile Homes.
E.Network-Powered Broadband Communications Sys\u00c3\u008dtems Wiring Methods Within Buildi
830-54.Medium Power Network-Powered Broadband Communications System Wiring Methods Within Buildings. <\/td>\n<\/tr>\n
559<\/td>\n830-55.Low Power Network-Powered Broadband Com\u00c3\u008dmunications System Wiring Methods.
830-56.Protection Against Physical Damage.
830-57.Bends.
830-58.Installation of Network-Powered Broadband Communications Cables and Equipment. <\/td>\n<\/tr>\n
561<\/td>\nCHAPTER 9 Tables <\/td>\n<\/tr>\n
571<\/td>\nAPPENDIX A Extract References <\/td>\n<\/tr>\n
574<\/td>\nAPPENDIX B
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. <\/td>\n<\/tr>\n
583<\/td>\nAPPENDIX C Conduit and Tubing Fill Tables for Conductors and Fixture Wires of the same Size <\/td>\n<\/tr>\n
607<\/td>\nAPPENDIX D <\/td>\n<\/tr>\n
615<\/td>\nAPPENDIX E Article 250 Cross Reference
E2.\u00ef\u00bf\u00bdCross Reference from the 1996 NEC to the 1999 NEC <\/td>\n<\/tr>\n
616<\/td>\nE2.\u00ef\u00bf\u00bdCross Reference from the 1996 NEC to the 1999 NEC <\/td>\n<\/tr>\n
618<\/td>\nINDEX <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

NFPA 70: National Electrical Code (NEC)<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
NFPA<\/b><\/a><\/td>\n1999<\/td>\n648<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":135838,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2638],"product_tag":[],"class_list":{"0":"post-135829","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-nfpa","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/135829","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/135838"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=135829"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=135829"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=135829"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}