2017 NEC Table Of Contents

2017 NEC TABLE OF CONTENTS(D) 1000 Volts Between Conductors225.24 Outdoor Lampholders225.8 Calculation of Loads 1000 Volts, Nominal, or Less225.25 Location of Outdoor Lamps(A) Branch Circuits225.26 Vegetation as Support(B) Feeders225.27 Raceway Seal225.10 Wiring on Buildings (or Other Structures)Part II. Buildings or Other Structures Supplied225.11 Feeder and Branch-Circuit Conductors Entering,by a Feeder(s) or Branch Circuit(s)Exiting, or Attached to Buildings or Structures225.30 Number of Supplies225.12 Open-Conductor Supports(A) Special Conditions225.14 Open-Conductor Spacings(B) Special Occupancies(A) 1000 Volts, Nominal, or Less(C) Capacity Requirements(B) Over 1000 Volts, Nominal(D) Different Characteristics(C) Separation from Other Circuits(E) Documented Switching Procedures(D) Conductors on Poles(F) One- or Two-Family Dwelling Unit(s)225.15 Supports over Buildings225.31 Disconnecting Means225.16 Attachment to Buildings225.32 Location(A) Point of Attachment225.33 Maximum Number of Disconnects(B) Means of Attachment(A) General225.17 Masts as Supports(B) Single-Pole Units(A) Strength225.34 Grouping of Disconnects(B) Attachment(A) General225.18 Clearance for Overhead Conductors and Cables(B) Additional Disconnecting Means225.19 Clearances from Buildings for Conductors of Not225.35 Access to Occupantsover 1000 Volts, Nominal225.36 Type of Disconnecting Means(A) Above Roofs225.37 Identification(B) From Nonbuilding or Nonbridge Structures225.38 Disconnect Construction(C) Horizontal Clearances(A) Manually or Power Operable(D) Final Spans(B) Simultaneous Opening of Poles(E) Zone for Fire Ladders(C) Disconnection of Grounded Conductor225.20 Protection Against Physical Damage(D) Indicating225.21 Multiconductor Cables on Exterior Surfaces225.39 Rating of Disconnectof Buildings (or Other Structures)(A) One-Circuit Installation225.22 Raceways on Exterior Surfaces of Buildings(B) Two-Circuit Installationsor Other Structures(C) One-Family Dwelling7 Page

2017 NEC TABLE OF CONTENTS(D) All OthersSupplied Through Another225.40 Access to Overcurrent Protective Devices230.6 Conductors Considered Outside the BuildingPart III. Over 1000 Volts230.7 Other Conductors in Raceway or Cable225.50 Sizing of Conductors230.8 Raceway Seal225.51 Isolating Switches230.9 Clearances on Buildings225.52 Disconnecting Means(A) Clearances(A) Location(B) Vertical Clearance(B) Type(C) Building Openings(C) Locking230.10 Vegetation as Support(D) IndicatingPart II. Overhead Service Conductors(E) Uniform Position230.22 Insulation or Covering(F) Identification230.23 Size and Rating225.56 Inspections and Tests(A) General(A) Pre-Energization and Operating Tests(B) Minimum Size(B) Test Report(C) Grounded Conductors225.60 Clearances over Roadways, Walkways, Rail, Water,230.24 Clearancesand Open Land(A) Above Roofs(A) 22 kV, Nominal, to Ground or Less(B) Vertical Clearance for Overhead Service Conductors(B) Over 22 kV Nominal to Ground(C) Clearance from Building Openings(C) Special Cases(D) Clearance from Swimming Pools225.61 Clearances over Buildings and Other Structures(E) Clearance from Communication Wires and Cables(A) 22 kV Nominal to Ground or Less230.26 Point of Attachment(B) Over 22 kV Nominal to Ground230.27 Means of AttachmentArticle 230 Services230.28 Service Masts as Supports230.1 Scope(A) StrengthPart I. General(B) Attachment230.2 Number of Services230.29 Supports over Buildings(A) Special ConditionsPart III. Underground Service Conductors(B) Special Occupancies230.30 Installation(C) Capacity Requirements(A) Insulation(D) Different Characteristics(B) Wiring Methods(E) Identification230.31 Size and Rating230.3 One Building or Other Structure Not to Be(A) General8 Page

2017 NEC TABLE OF CONTENTS(B) Minimum Size(G) Arranged That Water Will Not Enter Service(C) Grounded ConductorsRaceway or Equipment230.32 Protection Against Damage230.56 Service Conductor with the Higher Voltage230.33 Spliced Conductorsto GroundPart IV. Service-Entrance ConductorsPart V. Service Equipment — General230.40 Number of Service-Entrance Conductor Sets230.62 Service Equipment — Enclosed or Guarded230.41 Insulation of Service-Entrance Conductors(A) Enclosed230.42 Minimum Size and Rating(B) Guarded(A) General230.66 Marking(B) Specific InstallationsPart VI. Service Equipment — Disconnecting Means(C) Grounded Conductors230.70 General230.43 Wiring Methods for 1000 Volts, Nominal, or Less(A) Location230.44 Cable Trays(B) Marking230.46 Spliced Conductors(C) Suitable for Use230.50 Protection Against Physical Damage230.71 Maximum Number of Disconnects(A) Underground Service-Entrance Conductors(A) General(B) All Other Service-Entrance Conductors(B) Single-Pole Units230.51 Mounting Supports230.72 Grouping of Disconnects(A) Service-Entrance Cables(A) General(B) Other Cables(B) Additional Service Disconnecting Means(C) Individual Open Conductors(C) Access to Occupants230.52 Individual Conductors Entering Buildings230.74 Simultaneous Opening of Polesor Other Structures230.75 Disconnection of Grounded Conductor230.53 Raceways to Drain230.76 Manually or Power Operable230.54 Overhead Service Locations230.77 Indicating(A) Service Head230.79 Rating of Service Disconnecting Means(B) Service-Entrance Cables Equipped(A) One-Circuit Installationswith Service Head or Gooseneck(B) Two-Circuit Installations(C) Service Heads and Goosenecks Above(C) One-Family DwellingsService-Drop or Overhead Service Attachment(D) All Others(D) Secured230.80 Combined Rating of Disconnects(E) Separately Bushed Openings230.81 Connection to Terminals(F) Drip Loops230.82 Equipment Connected to the Supply Side9 Page

2017 NEC TABLE OF CONTENTSof Service Disconnect230.210 Service Equipment — General ProvisionsPart VII. Service Equipment — Overcurrent Protection230.211 Switchgear230.90 Where Required230.212 Over 35,000 Volts(A) Ungrounded ConductorArticle 240 Overcurrent Protection(B) Not in Grounded ConductorPart I. General230.91 Location240.1 Scope230.92 Locked Service Overcurrent Devices240.2 Definitions230.93 Protection of Specific Circuits240.3 Other Articles230.94 Relative Location of Overcurrent Device240.4 Protection of Conductorsand Other Service Equipment(A) Power Loss Hazard230.95 Ground-Fault Protection of Equipment(B) Overcurrent Devices Rated 800 Amperes or Less(A) Setting(C) Overcurrent Devices Rated over 800 Amperes(B) Fuses(D) Small Conductors(C) Performance Testing(E) Tap ConductorsPart VIII. Services Exceeding 1000 Volts, Nominal(F) Transformer Secondary Conductors230.200 General(G) Overcurrent Protection for Specific ConductorApplications230.202 Service-Entrance Conductors(A) Conductor Size(B) Wiring Methods230.204 Isolating Switches(A) Where Required(B) Fuses as Isolating Switch(C) Accessible to Qualified Persons Only(D) Connection to Ground230.205 Disconnecting Means(A) Location(B) Type(C) Remote Control230.206 Overcurrent Devices as Disconnecting Means230.208 Protection Requirements(A) Equipment Type(B) Enclosed Overcurrent Devices230.209 Surge Arresters240.5 Protection of Flexible Cords, Flexible Cables,and Fixture Wires(A) Ampacities(B) Branch-Circuit Overcurrent Device240.6 Standard Ampere Ratings(A) Fuses and Fixed-Trip Circuit Breakers(B) Adjustable-Trip Circuit Breakers(C) Restricted Access Adjustable-Trip Circuit Breakers240.8 Fuses or Circuit Breakers in Parallel240.9 Thermal Devices240.10 Supplementary Overcurrent Protection240.12 Electrical System Coordination240.13 Ground-Fault Protection of Equipment240.15 Ungrounded Conductors(A) Overcurrent Device Required(B) Circuit Breaker as Overcurrent Device10 P a g e

2017 NEC TABLE OF CONTENTSPart II. Location(B) Marking240.21 Location in Circuit(C) Hexagonal Configuration(A) Branch-Circuit Conductors(D) No Energized Parts(B) Feeder Taps(E) Screw Shell(C) Transformer Secondary Conductors240.51 Edison-Base Fuses(D) Service Conductors(A) Classification(E) Busway Taps(B) Replacement Only(F) Motor Circuit Taps240.52 Edison-Base Fuseholders(G) Conductors from Generator Terminals240.53 Type S Fuses(H) Battery Conductors(A) Classification240.22 Grounded Conductor(B) Noninterchangeable240.23 Change in Size of Grounded Conductor240.54 Type S Fuses, Adapters, and Fuseholders240.24 Location in or on Premises(A) To Fit Edison-Base Fuseholders(A) Accessibility(B) To Fit Type S Fuses Only(B) Occupancy(C) Nonremovable(C) Not Exposed to Physical Damage(D) Nontamperable(D) Not in Vicinity of Easily Ignitible Material(E) Interchangeability(E) Not Located in BathroomsPart VI. Cartridge Fuses and Fuseholders(F) Not Located over Steps240.60 GeneralPart III. Enclosures(A) Maximum Voltage — 300-Volt Type240.30 General(B) Noninterchangeable — 0–6000-Ampere(A) Protection from Physical DamageCartridge Fuseholders(B) Operating Handle(C) Marking240.32 Damp or Wet Locations(D) Renewable Fuses240.33 Vertical Position240.61 ClassificationPart IV. Disconnecting and Guarding240.67 Arc Energy Reduction240.40 Disconnecting Means for Fuses(A) Documentation240.41 Arcing or Suddenly Moving Parts(B) Method to Reduce Clearing Time(A) LocationPart VII. Circuit Breakers(B) Suddenly Moving Parts240.80 Method of OperationPart V. Plug Fuses, Fuseholders, and Adapters240.81 Indicating240.50 General240.82 Nontamperable(A) Maximum Voltage240.83 Marking11 P a g e

2017 NEC TABLE OF CONTENTS(A) Durable and Visible(A) Rating or Setting of Overcurrent Protective Devices(B) Location(B) Feeder Taps(C) Interrupting RatingArticle 250 Grounding and Bonding(D) Used as SwitchesPart I. General(E) Voltage Marking250.1 Scope240.85 Applications250.2 Definition240.86 Series Ratings250.3 Application of Other Articles(A) Selected Under Engineering Supervision250.4 General Requirements for Grounding and Bondingin Existing Installations(A) Grounded Systems(B) Tested Combinations(B) Ungrounded Systems(C) Motor Contribution250.6 Objectionable Current240.87 Arc Energy Reduction(A) Arrangement to Prevent Objectionable Current(A) Documentation(B) Alterations to Stop Objectionable Current(B) Method to Reduce Clearing Time(C) Temporary Currents Not Classified asPart VIII. Supervised Industrial InstallationsObjectionable Currents240.90 General(D) Limitations to Permissible Alterations240.91 Protection of Conductors(E) Isolation of Objectionable Direct-Current(A) GeneralGround Currents(B) Devices Rated Over 800 Amperes250.8 Connection of Grounding and Bonding Equipment240.92 Location in Circuit(A) Permitted Methods(A) Feeder and Branch-Circuit Conductors(B) Methods Not Permitted(B) Feeder Taps250.10 Protection of Ground Clamps and Fittings(C) Transformer Secondary Conductors250.12 Clean Surfacesof Separately Derived SystemsPart II. System Grounding(D) Outside Feeder Taps250.20 Alternating-Current Systems to Be Grounded(E) Protection by Primary Overcurrent Device(A) Alternating-Current Systems of Less Than 50 VoltsPart IX. Overcurrent Protection over 1000 Volts,(B) Alternating-Current Systems of 50 Volts to 1000 VoltsNominal(C) Alternating-Current Systems of over 1000 Volts240.100 Feeders and Branch Circuits(D) Impedance Grounded Neutral Systems(A) Location and Type of Protection250.21 Alternating-Current Systems of 50 Volts to(B) Protective Devices1000 Volts Not Required to Be Grounded(C) Conductor Protection(A) General240.101 Additional Requirements for Feeders(B) Ground Detectors12 P a g e

2017 NEC TABLE OF CONTENTS(C) Marking250.35 Permanently Installed Generators250.22 Circuits Not to Be Grounded(A) Separately Derived System250.24 Grounding Service-Supplied Alternating-Current(B) Nonseparately Derived SystemSystems250.36 High-Impedance Grounded Neutral Systems(A) System Grounding Connections(A) Location(B) Main Bonding Jumper(B) Conductor Insulation and Ampacity(C) Grounded Conductor Brought to Service Equipment(C) System Grounding Connection(D) Grounding Electrode Conductor(D) Conductor Routing(E) Ungrounded System Grounding Connections(E) Equipment Bonding Jumper250.26 Conductor to Be Grounded — Alternating-Current(F) Grounding Electrode Conductor Connection LocationSystems(G) Equipment Bonding Jumper Size250.28 Main Bonding Jumper and System Bonding JumperPart III. Grounding Electrode System and Grounding(A) MaterialElectrode Conductor(B) Construction250.50 Grounding Electrode System(C) Attachment250.52 Grounding Electrodes(D) Size(A) Electrodes Permitted for Grounding250.30 Grounding Separately Derived Alternating Current(B) Not Permitted for Use as Grounding ElectrodesSystems250.53 Grounding Electrode System Installation(A) Grounded Systems(A) Rod, Pipe, and Plate Electrodes(B) Ungrounded Systems(B) Electrode Spacing(C) Outdoor Source(C) Bonding Jumper250.32 Buildings or Structures Supplied by a Feeder(s)(D) Metal Underground Water Pipeor Branch Circuit(s)(E) Supplemental Electrode Bonding Connection Size(A) Grounding Electrode(F) Ground Ring(B) Grounded Systems(G) Rod and Pipe Electrodes(C) Ungrounded Systems(H) Plate Electrode(D) Disconnecting Means Located in Separate250.54 Auxiliary Grounding ElectrodesBuilding or Structure on the Same Premises250.58 Common Grounding Electrode(E) Grounding Electrode Conductor250.60 Use of Strike Termination Devices250.34 Portable and Vehicle-Mounted Generators250.62 Grounding Electrode Conductor Material(A) Portable Generators250.64 Grounding Electrode Conductor Installation(B) Vehicle-Mounted Generators(A) Aluminum or Copper-Clad Aluminum Conductors(C) Grounded Conductor Bonding(B) Securing and Protection Against Physical Damage13 P a g e

2017 NEC TABLE OF CONTENTS(C) Continuous(A) General(D) Building or Structure with Multiple(B) Isolated Grounding CircuitsDisconnecting Means in Separate Enclosures250.97 Bonding for Over 250 Volts(E) Raceways and Enclosures for Grounding250.98 Bonding Loosely Jointed Metal RacewaysElectrode Conductors250.100 Bonding in Hazardous (Classified) Locations(F) Installation to Electrode(s)250.102 Grounded Conductor, Bonding Conductors,250.66 Size of Alternating-Current Grounding Electrodeand JumpersConductor(A) Material(A) Connections to a Rod, Pipe, or Plate Electrode(s)(B) Attachment(B) Connections to Concrete-Encased Electrodes(C) Size — Supply-Side Bonding Jumper(C) Connections to Ground Rings(D) Size — Equipment Bonding Jumper on Load250.68 Grounding Electrode Conductor and BondingSide of an Overcurrent DeviceJumper Connection to Grounding Electrodes(E) Installation(A) Accessibility250.104 Bonding of Piping Systems and Exposed(B) Effective Grounding PathStructural Metal(C) Grounding Electrode Conductor Connections(A) Metal Water Piping250.70 Methods of Grounding and Bonding Conductor(B) Other Metal PipingConnection to Electrodes(C) Structural MetalPart IV. Enclosure, Raceway, and Service Cable Connections(D) Separately Derived Systems250.80 Service Raceways and Enclosures250. Part VI. Equipment Grounding and Equipment250.84 Underground Service Cable or RacewayGrounding Conductors(A) Underground Service Cable250.110 Equipment Fastened in Place (Fixed) or(B) Underground Service Raceway Containing CableConnected by Permanent Wiring Methods250.86 Other Conductor Enclosures and Raceways250.112 Specific Equipment Fastened in Place (Fixed)Part V. Bondingor Connected by Permanent Wiring Methods250.90 General(A) Switchgear and Switchboard Frames and Structures250.92 Services(B) Pipe Organs(A) Bonding of Equipment for Services(C) Motor Frames(B) Method of Bonding at the Service(D) Enclosures for Motor Controllers250.94 Bonding for Communication Systems(E) Elevators and Cranes(A) The Intersystem Bonding Termination Device(F) Garages, Theaters, and Motion Picture Studios(B) Other Means(G) Electric Signs250.96 Bonding Other Enclosures(H) Motion Picture Projection Equipment14 P a g e

2017 NEC TABLE OF CONTENTS(I) Remote-Control, Signaling, and Fire Alarm Circuits(B) For Ungrounded Systems(J) Luminaires(C) Nongrounding Receptacle Replacement(K) Skid-Mounted Equipmentor Branch Circuit Extensions(L) Motor-Operated Water Pumps250.132 Short Sections of Raceway(M) Metal Well Casings250.134 Equipment Fastened in Place or Connected by250.114 Equipment Connected by Cord and PlugPermanent Wiring Methods (Fixed) — Grounding250.116 Nonelectrical Equipment(A) Equipment Grounding Conductor Types250.118 Types of Equipment Grounding Conductors(B) With Circuit Conductors250.119 Identification of Equipment Grounding Conductors250.136 Equipment Considered Grounded(A) Conductors 4 AWG and Larger(A) Equipment Secured to Grounded Metal Supports(B) Multiconductor Cable(B) Metal Car Frames(C) Flexible Cord250.138 Cord-and-Plug-Connected Equipment250.120 Equipment Grounding Conductor Installation(A) By Means of an Equipment Grounding Conductor(A) Raceway, Cable Trays, Cable Armor,(B) By Means of a Separate Flexible Wire or StrapCablebus, or Cable Sheaths250.140 Frames of Ranges and Clothes Dryers(B) Aluminum and Copper-Clad Aluminum Conductors250.142 Use of Grounded Circuit Conductor for(C) Equipment Grounding Conductors Smaller Than 6 AWGGrounding Equipment250.121 Use of Equipment Grounding Conductors(A) Supply-Side Equipment250.122 Size of Equipment Grounding Conductors(B) Load-Side Equipment(A) General250.144 Multiple Circuit Connections(B) Increased in Size250.146 Connecting Receptacle Grounding Terminal to Box(C) Multiple Circuits(A) Surface-Mounted Box(D) Motor Circuits(B) Contact Devices or Yokes(E) Flexible Cord and Fixture Wire(C) Floor Boxes(F) Conductors in Parallel(D) Isolated Ground Receptacles(G) Feeder Taps250.148 Continuity and Attachment of Equipment250.124 Equipment Grounding Conductor ContinuityGrounding Conductors to Boxes(A) Separable Connections(A) Connections(B) Switches(B) Grounding Continuity250.126 Identification of Wiring Device Terminals(C) Metal BoxesPart VII. Methods of Equipment Grounding(D) Nonmetallic Boxes250.130 Equipment Grounding Conductor Connections(E) Solder(A) For Grounded SystemsPart VIII. Direct-Current Systems15 P a g e

2017 NEC TABLE OF CONTENTS250.160 General250.178 Instrument Equipment Grounding Conductor250.162 Direct-Current Circuits and Systems to BePart X. Grounding of Systems and CircuitsGroundedof over 1000 Volts(A) Two-Wire, Direct-Current Systems250.180 General(B) Three-Wire, Direct-Current Systems250.182 Derived Neutral Systems250.164 Point of Connection for Direct-Current Systems250.184 Solidly Grounded Neutral Systems(A) Off-Premises Source(A) Neutral Conductor(B) On-Premises Source(B) Single-Point Grounded Neutral System250.166 Size of the Direct-Current Grounding Electrode(C) Multigrounded Neutral SystemsConductor250.186 Grounding Service-Supplied Alternating-Current(A) Not Smaller Than the Neutral ConductorSystems(B) Not Smaller Than the Largest Conductor(A) Systems with a Grounded Conductor at the(C) Connected to Rod, Pipe, or Plate ElectrodesService Point(D) Connected to a Concrete-Encased Electrode(B) Systems Without a Grounded Conductor

2017 NEC TABLE OF CO NTENTS Part V. Manholes and Other Electrical Enclosures Intended for Personnel Entry 110.70 General 110.71 Strength 110.72 Cabling Work Space 110.73 Equipment Work Space 110.74 Conductor Installation (A) 1000 Volts, Nominal, or Less (B) Over 1000 Volts, Nominal 110.75 Access to Manholes (A) Dimensions (B) Obstructions