necplus :: code
Welcome joseph.tedesco@yahoo.com | Log Out
September 17, 2007 Home | Help
search text Index
NEC2008 Edition
search Definitions
NFPA 70™ National Electrical Code® 2008 Edition
Important Notices and Disclaimers
History and Development
ARTICLE 90 Introduction
Chapter 1 General
Chapter 2 Wiring and Protection
Chapter 3 Wiring Methods and Materials
Chapter 4 Equipment for General Use
The following sections of the 2008 Edition of the
Chapter 5 Special Occupancies National Electrical Code® contain changes from the
2005 Edition.
Chapter 6 Special Equipment
Chapter 7 Special Conditions
Chapter 8 Communications Systems ● 90.2 Scope
Chapter 9 Tables ● 90.3 Code Arrangement
Annex A Product Safety Standards
● ARTICLE 100 Definitions : I. General
Annex B Application Information for Ampacity Calculation
● 110.7 Wiring Integrity
Annex C Conduit and Tubing Fill Tables for Conductors and
Fixture Wires of the Same Size ● 110.11 Deteriorating Agents
Annex D Examples
Annex E Types of Construction ● 110.12 Mechanical Execution of Work
Annex F Availability and Reliability for Critical Operations ● 110.16 Flash Protection
Power Systems; and Development and Implementation
of Functional Performance Tests (FPTs) for Critical ● 110.20 Enclosure Types
Operations Power Systems
Annex G Supervisory Control and Data Acquisition (SCADA). ● 110.22 Identification of Disconnecting Means
Annex H Administration and Enforcement ● 110.26 Spaces About Electrical Equipment
Formal Interpetations
● 110.32 Work Space About Equipment
Index
● 110.33 Entrance to Enclosures and Access to Working Space
● 110.34 Work Space and Guarding
● 200.2 General
● 200.3 Connection to Grounded System
● 210.4 Multiwire Branch Circuits
● 210.5 Identification for Branch Circuits
● 210.6 Branch-Circuit Voltage Limitations
● 210.8 Ground-Fault Circuit-Interrupter Protection
for Personnel
● 210.12 Arc-Fault Circuit-Interrupter Protection
● 210.19 Conductors — Minimum Ampacity and Size
● 210.25 Branch Circuits in Buildings with More Than
One Occupancy
● 210.52 Dwelling Unit Receptacle Outlets
● 210.60 Guest Rooms, Guest Suites, Dormitories, and
Similar Occupancies
● 210.62 Show Windows
● 215.2 Minimum Rating and Size
● 215.4 Feeders with Common Neutral Conductor
● 215.10 Ground-Fault Protection of Equipment
● 215.12 Identification for Feeders
● 220.52 Small-Appliance and Laundry Loads — Dwelling Unit
● 220.82 Dwelling Unit
● 220.83 Existing Dwelling Unit
● 220.84 Multifamily Dwelling
● 225.10 Wiring on Buildings
● 225.33 Maximum Number of Disconnects
● 225.39 Rating of Disconnect
● ARTICLE 230 Services
● 230.40 Number of Service-Entrance Conductor Sets
● 230.44 Cable Trays
● 230.54 Overhead Service Locations
● 230.71 Maximum Number of Disconnects
● 230.95 Ground-Fault Protection of Equipment
● 230.205 Disconnecting Means
● 240.4 Protection of Conductors
● 240.5 Protection of Flexible Cords, Flexible Cables,
and Fixture Wires
● 240.15 Ungrounded Conductors
● 240.21 Location in Circuit
● 240.24 Location in or on Premises
● 240.86 Series Ratings
● 240.92 Location in Circuit
● ARTICLE 250 Grounding and Bonding
● 250.4 General Requirements for Grounding and Bonding
● 250.8 Connection of Grounding and Bonding Equipment
● 250.20 Alternating-Current Systems to Be Grounded
● 250.22 Circuits Not to Be Grounded
● 250.24 Grounding Service-Supplied Alternating-
Current Systems
● 250.28 Main Bonding Jumper and System Bonding Jumper
● 250.30 Grounding Separately Derived Alternating-
Current Systems
● 250.32 Buildings or Structures Supplied by a Feeder(s)
or Branch Circuit(s)
● 250.35 Permanently Installed Generators
● 250.52 Grounding Electrodes
● 250.54 Auxiliary Grounding Electrodes
● 250.64 Grounding Electrode Conductor Installation
● 250.68 Grounding Electrode Conductor and Bonding
Jumper Connection to Grounding Electrodes
● 250.94 Bonding for Other Systems
● 250.96 Bonding Other Enclosures
● 250.104 Bonding of Piping Systems and Exposed
Structural Steel
● 250.112 Fastened in Place or Connected by
Permanent Wiring Methods (Fixed) — Specific
● 250.119 Identification of Equipment Grounding Conductors
● 250.122 Size of Equipment Grounding Conductors
● 250.142 Use of Grounded Circuit Conductor for
Grounding Equipment
● 250.146 Connecting Receptacle Grounding Terminal to Box
● 250.166 Size of the Direct-Current Grounding
Electrode Conductor
● 250.168 Direct-Current System Bonding Jumper
● 250.170 Instrument Transformer Circuits
● ARTICLE 280 Surge Arresters, Over 1 kV
● 280.4 Surge Arrester Selection
● ARTICLE 285 Surge-Protective Devices (SPDs), 1 kV or Less
● 300.3 Conductors
● 300.4 Protection Against Physical Damage
● 300.5 Underground Installations
● 300.6 Protection Against Corrosion and Deterioration
● 300.7 Raceways Exposed to Different Temperatures
● 300.9 Raceways in Wet Locations Above Grade
● 300.12 Mechanical Continuity — Raceways and Cables
● 300.15 Boxes, Conduit Bodies, or Fittings — Where Required
● 300.16 Raceway or Cable to Open or Concealed Wiring
● 300.19 Supporting Conductors in Vertical Raceways
● 300.20 Induced Currents in Ferrous Metal Enclosures
or Ferrous Metal Raceways
● 300.22 Wiring in Ducts, Plenums, and Other Air-
Handling Spaces
● 300.50 Underground Installations
● 310.4 Conductors in Parallel
● 310.7 Direct-Burial Conductors
● 310.8 Locations
● 310.13 Conductor Constructions and Applications
● 310.15 Ampacities for Conductors Rated 0–2000 Volts
● 312.4 Repairing Noncombustible Surfaces
● 314.4 Metal Boxes
● 314.16 Number of Conductors in Outlet, Device, and
Junction Boxes, and Conduit Bodies
● 314.22 Surface Extensions
● 314.24 Minimum Depth of Boxes for Outlets, Devices,
and Utilization Equipment
● 314.27 Outlet Boxes
● 314.28 Pull and Junction Boxes and Conduit Bodies
● 314.30 Handhole Enclosures
● 320.2 Definition
● 320.10 Uses Permitted
● 328.10 Uses Permitted
● 330.10 Uses Permitted
● 330.104 Conductors
● 334.12 Uses Not Permitted
● 334.15 Exposed Work
● 334.80 Ampacity
● 336.10 Uses Permitted
● 336.104 Conductors
● 338.12 Uses Not Permitted
● 342.30 Securing and Supporting
● 344.10 Uses Permitted
● 344.30 Securing and Supporting
● 348.12 Uses Not Permitted
● 348.30 Securing and Supporting
● 348.60 Grounding and Bonding
● 350.30 Securing and Supporting
● 350.60 Grounding and Bonding
● ARTICLE 352 Rigid Polyvinyl Chloride Conduit: Type PVC
● 352.10 Uses Permitted
● 352.12 Uses Not Permitted
● 352.30 Securing and Supporting
● 353.1 Scope
● 353.10 Uses Permitted
● 353.12 Uses Not Permitted
● 353.20 Size
● 353.48 Joints
● 354.10 Uses Permitted
● 354.12 Uses Not Permitted
● ARTICLE 355 Reinforced Thermosetting Resin Conduit:
Type RTRC
● 356.10 Uses Permitted
● 356.12 Uses Not Permitted
● 356.20 Size
● 358.12 Uses Not Permitted
● 358.30 Securing and Supporting
● 362.12 Uses Not Permitted
● 362.30 Securing and Supporting
● 372.4 Uses Not Permitted
● 374.3 Uses Not Permitted
● 376.22 Number of Conductors and Ampacity
● 376.56 Splices, Taps, and Power Distribution Blocks
● 376.100 Construction
● 378.12 Uses Not Permitted
● 380.2 Use
● ARTICLE 382 Nonmetallic Extensions
● 384.22 Number of Conductors
● 388.12 Uses Not Permitted
● 388.30 Securing and Supporting
● 388.56 Splices and Taps
● 392.3 Uses Permitted
● 392.8 Cable Installation
● 392.9 Number of Multiconductor Cables, Rated 2000 Volts
or Less, in Cable Trays
● 392.11 Ampacity of Cables, Rated 2000 Volts or Less,
in Cable Trays
● 396.10 Uses Permitted
● 396.30 Messenger
● 400.5 Ampacities for Flexible Cords and Cables
● 400.31 Construction
● 402.11 Uses Not Permitted
● 404.4 Damp or Wet Locations
● 404.8 Accessibility and Grouping
● 404.9 Provisions for General-Use Snap Switches
● 406.3 General Installation Requirements
● 406.6 Attachment Plugs, Cord Connectors, and
Flanged Surface Devices
● 406.8 Receptacles in Damp or Wet Locations
● 406.11 Tamper-Resistant Receptacles in Dwelling Units
● ARTICLE 408 Switchboards and Panelboards
● 408.3 Support and Arrangement of Busbars and Conductors
● 408.4 Circuit Directory or Circuit Identification
● 409.2 Definitions
● 409.21 Overcurrent Protection
● 409.104 Wiring Space in Industrial Control Panels
● 409.106 Spacings
● 409.110 Marking
● ARTICLE 410 Luminaires, Lampholders, and Lamps
● 410.6 Listing Required
● 410.16 Luminaires in Clothes Closets
● 410.30 Supports
● 410.62 Cord-Connected Lampholders and Luminaires
● 410.74 Luminaire Rating
● 410.130 General
● 410.141 Control
● 410.151 Installation
● 411.2 Definition
● 411.3 Listing Required
● 411.5 Secondary Circuits
● 422.10 Branch-Circuit Rating
● 422.13 Storage-Type Water Heaters
● 422.51 Cord-and-Plug-Connected Vending Machines
● 422.52 Electric Drinking Fountains
● 424.19 Disconnecting Means
● 426.51 Controllers
● 427.13 Identification
● 427.56 Controls
● ARTICLE 430 Motors, Motor Circuits, and Controllers
● 430.2 Definitions
● 430.32 Continuous-Duty Motors
● 430.52 Rating or Setting for Individual Motor Circuit
● 430.74 Electrical Arrangement of Control Circuits
● 430.81 General
● 430.87 Number of Motors Served by Each Controller
● 430.102 Location
● 430.103 Operation
● 430.108 Every Disconnecting Means
● 430.110 Ampere Rating and Interrupting Capacity
● 430.126 Motor Overtemperature Protection
● 430.227 Disconnecting Means
● 440.14 Location
● 440.53 Overload Relays
● 440.54 Motor-Compressors and Equipment on 15- or
20-Ampere Branch Circuits — Not Cord-and-Attachment-
Plug-Connected
● 440.55 Cord-and-Attachment-Plug-Connected
Motor-Compressors and Equipment on 15- or 20-
Ampere Branch Circuits
● 445.13 Ampacity of Conductors
● 445.18 Disconnecting Means Required for Generators
● 445.19 Generators Supplying Multiple Loads
● 450.5 Grounding Autotransformers
● 460.10 Grounding
● 460.27 Grounding
● 480.5 Disconnecting Means
● 490.44 Fused Interrupter Switches
● 490.46 Circuit Breaker Locking
● ARTICLE 500 Hazardous (Classified) Locations, Classes I,
II, and III, Divisions 1 and 2
● 500.6 Material Groups
● 500.7 Protection Techniques
● 500.8 Equipment
● 501.10 Wiring Methods
● 501.30 Grounding and Bonding, Class I, Divisions 1 and 2
● 501.35 Surge Protection
● 502.5 Explosionproof Equipment
● 502.10 Wiring Methods
● 502.30 Grounding and Bonding, Class II, Divisions 1 and 2
● 502.35 Surge Protection — Class II, Divisions 1 and 2
● 502.115 Switches, Circuit Breakers, Motor Controllers,
and Fuses
● 502.120 Control Transformers and Resistors
● 502.130 Luminaires
● 502.150 Signaling, Alarm, Remote-Control,
and Communications Systems; and Meters, Instruments,
and Relays
● ARTICLE 503 Class III Locations
● 503.30 Grounding and Bonding — Class III, Divisions 1 and 2
● 504.2 Definitions
● 504.10 Equipment Installation
● 504.20 Wiring Methods
● 504.30 Separation of Intrinsically Safe Conductors
● 504.50 Grounding
● 504.70 Sealing
● 505.2 Definitions
● 505.7 Special Precaution
● 505.8 Protection Techniques
● 505.9 Equipment
● 505.15 Wiring Methods
● 505.17 Flexible Cords, Class I, Zones 1 and 2
● 505.25 Grounding and Bonding
● ARTICLE 506 Zone 20, 21, and 22 Locations for
Combustible Dusts or Ignitible Fibers/Flyings
● 506.2 Definitions
● 506.8 Protection Techniques
● 506.9 Equipment Requirements
● 506.15 Wiring Methods
● 506.25 Grounding and Bonding
● 511.2 Definitions
● 511.3 Area Classification, General
● 513.2 Definitions
● 513.3 Classification of Locations
● 515.7 Wiring and Equipment Above Class I Locations
● 516.10 Special Equipment
● ARTICLE 517 Health Care Facilities
● 517.2 Definitions
● 517.20 Wet Procedure Locations
● 517.30 Essential Electrical Systems for Hospitals
● 517.32 Life Safety Branch
● 517.34 Equipment System Connection to Alternate
Power Source
● 517.40 Essential Electrical Systems for Nursing Homes
and Limited Care Facilities
● 517.43 Connection to Critical Branch
● 517.44 Sources of Power
● 517.61 Wiring and Equipment
● 517.71 Connection to Supply Circuit
● 517.80 Patient Care Areas
● 517.160 Isolated Power Systems
● 518.4 Wiring Methods
● 518.5 Supply
● 520.2 Definitions
● 520.27 Stage Switchboard Feeders
● 520.53 Construction and Feeders
● ARTICLE 522 Control Systems for Permanent
Amusement Attractions
● ARTICLE 525 Carnivals, Circuses, Fairs, and Similar Events
● 525.2 Definitions
● 525.5 Overhead Conductor Clearances
● 525.11 Multiple Sources of Supply
● 525.21 Rides, Tents, and Concessions
● 525.30 Equipment Bonding
● 530.13 Stage Lighting and Effects Control
● 540.20 Listing Requirements
● 540.32 Listing Requirements
● 547.2 Definitions
● 547.5 Wiring Methods
● 547.9 Electrical Supply to Building(s) or Structure(s) from
a Distribution Point
● 547.10 Equipotential Planes and Bonding of
Equipotential Planes
● 550.2 Definitions
● 550.11 Disconnecting Means and Branch-Circuit
Protective Equipment
● 550.13 Receptacle Outlets
● 550.15 Wiring Methods and Materials
● 550.18 Calculations
● 550.20 Outdoor Outlets, Luminaires, Air-Cooling
Equipment, and So Forth
● 550.25 Arc-Fault Circuit-Interrupter Protection
● 550.31 Allowable Demand Factors
● 550.33 Feeder
● ARTICLE 551 Recreational Vehicles and Recreational
Vehicle Parks
● 551.42 Branch Circuits Required
● 551.45 Distribution Panelboard
● 551.47 Wiring Methods
● 551.60 Factory Tests (Electrical)
● 551.73 Calculated Load
● 551.76 Grounding — Recreational Vehicle Site
Supply Equipment
● 551.78 Protection of Outdoor Equipment
● 552.47 Calculations
● 552.48 Wiring Methods
● 552.54 Luminaires
● 552.60 Factory Tests (Electrical)
● 555.9 Electrical Connections
● 555.12 Load Calculations for Service and Feeder Conductors
● 555.17 Disconnecting Means for Shore Power Connection(s)
● 555.19 Receptacles
● 555.21 Motor Fuel Dispensing Stations —
Hazardous (Classified) Locations
● 590.4 General
● 590.6 Ground-Fault Protection for Personnel
● 600.2 Definitions
● 600.4 Markings
● 600.5 Branch Circuits
● 600.6 Disconnects
● 600.7 Grounding and Bonding
● 600.9 Location
● 600.12 Field-Installed Secondary Wiring
● 600.21 Ballasts, Transformers, and Electronic
Power Supplies
● 600.24 Class 2 Power Sources
● 600.32 Neon Secondary-Circuit Wiring, over 1000
Volts, Nominal
● 600.41 Neon Tubing
● 600.42 Electrode Connections
● 604.2 Definition
● 604.6 Construction
● 610.31 Runway Conductor Disconnecting Means
● ARTICLE 620 Elevators, Dumbwaiters, Escalators,
Moving Walks, Platform Lifts, and Stairway Chairlifts
● 620.2 Definitions
● 620.3 Voltage Limitations
● 620.21 Wiring Methods
● 620.23 Branch Circuits for Machine Room or Control
Room/Machinery Space or Control Space Lighting
and Receptacle(s)
● 620.24 Branch Circuit for Hoistway Pit Lighting
and Receptacle(s)
● 620.44 Installation of Traveling Cables
● 620.51 Disconnecting Means
● 625.2 Definitions
● 625.23 Disconnecting Means
● ARTICLE 626 Electrified Truck Parking Space
● 640.6 Mechanical Execution of Work
● 645.2 Definition
● 645.5 Supply Circuits and Interconnecting Cables
● 645.10 Disconnecting Means
● 647.4 Wiring Methods
● 647.8 Lighting Equipment
● 660.3 Hazardous (Classified) Locations
● 665.12 Disconnecting Means
● 665.22 Access to Internal Equipment
● 670.3 Machine Nameplate Data
● 675.8 Disconnecting Means
● 680.2 Definitions
● 680.10 Underground Wiring Location
● 680.12 Maintenance Disconnecting Means
● 680.21 Motors
● 680.22 Area Lighting, Receptacles, and Equipment
● 680.23 Underwater Luminaires
● 680.24 Junction Boxes and Electrical Enclosures
for Transformers or Ground-Fault Circuit Interrupters
● 680.26 Equipotential Bonding
● 680.31 Pumps
● 680.43 Indoor Installations
● 680.51 Luminaires, Submersible Pumps, and
Other Submersible Equipment
● 680.71 Protection
● 680.74 Bonding
● 682.13 Wiring Methods and Installation
● 690.4 Installation
● 690.5 Ground-Fault Protection
● 690.10 Stand-Alone Systems
● 690.13 All Conductors
● 690.31 Methods Permitted
● 690.33 Connectors
● 690.43 Equipment Grounding
● 690.45 Size of Equipment Grounding Conductors
● 690.46 Array Equipment Grounding Conductors
● 690.47 Grounding Electrode System
● 690.57 Load Disconnect
● 690.64 Point of Connection
● 690.74 Battery Interconnections
● 692.41 System Grounding
● 692.65 Utility-Interactive Point of Connection
● 695.4 Continuity of Power
● 695.6 Power Wiring
● 700.6 Transfer Equipment
● 700.9 Wiring, Emergency System
● 700.12 General Requirements
● 700.23 Dimmer Systems
● 700.27 Coordination
● 701.7 Transfer Equipment
● 701.11 Legally Required Standby Systems
● 701.18 Coordination
● 702.5 Capacity and Rating
● 702.11 Outdoor Generator Sets
● ARTICLE 705 Interconnected Electric Power
Production Sources
● 705.2 Definitions
● 705.4 Equipment Approval
● 705.12 Point of Connection
● 705.22 Disconnect Device
● 705.30 Overcurrent Protection
● 705.40 Loss of Primary Source
● ARTICLE 708 Critical Operations Power Systems (COPS)
● 720.3 Hazardous (Classified) Locations
● 725.24 Mechanical Execution of Work
● 725.25 Abandoned Cables
● 725.48 Conductors of Different Circuits in the Same
Cable, Cable Tray, Enclosure, or Raceway
● 725.130 Wiring Methods and Materials on Load Side of
the Class 2 or Class 3 Power Source
● 725.139 Installation of Conductors of Different Circuits in
the Same Cable, Enclosure, or Raceway
● 725.154 Applications of Listed Class 2, Class 3, and
PLTC Cables
● 725.179 Listing and Marking of Class 2, Class 3, and
Type PLTC Cables
● 727.4 Uses Permitted
● 727.5 Uses Not Permitted
● 760.3 Other Articles
● 760.24 Mechanical Execution of Work
● 760.25 Abandoned Cables
● 760.30 Fire Alarm Circuit Identification
● 760.41 NPLFA Circuit Power Source Requirements
● 760.121 Power Sources for PLFA Circuits
● 760.130 Wiring Methods and Materials on Load Side of
the PLFA Power Source
● 760.139 Installation of Conductors of Different PLFA
Circuits, Class 2, Class 3, and Communications Circuits
in the Same Cable, Enclosure, Cable Tray, or Raceway
● 760.176 Listing and Marking of NPLFA Cables
● 760.179 Listing and Marking of PLFA Cables and
Insulated Continuous Line-Type Fire Detectors
● 770.2 Definitions
● 770.3 Other Articles
● 770.24 Mechanical Execution of Work
● 770.25 Abandoned Cables
● 770.26 Spread of Fire or Products of Combustion
● 770.48 Unlisted Cables and Raceways Entering Buildings
● 770.110 Raceways for Optical Fiber Cables
● 770.133 Installation of Optical Fibers and
Electrical Conductors
● 770.154 Applications of Listed Optical Fiber Cables
and Raceways
● 800.1 Scope
● 800.2 Definitions
● 800.3 Other Articles
● 800.24 Mechanical Execution of Work
● 800.25 Abandoned Cables
● 800.26 Spread of Fire or Products of Combustion
● 800.48 Unlisted Cables Entering Buildings
● 800.90 Protective Devices
● 800.93 Grounding or Interruption of Metallic Sheath
Members of Communications Cables
● 800.100 Cable and Primary Protector Grounding
● 800.133 Installation of Communications Wires, Cables,
and Equipment
● 800.154 Applications of Listed Communications Wires
and Cables and Communications Raceways
● 800.156 Dwelling Unit Communications Outlet
● 800.179 Communications Wires and Cables
● 810.21 Grounding Conductors — Receiving Stations
● 810.71 General
● 820.2 Definitions
● 820.15 Power Limitations
● 820.24 Mechanical Execution of Work
● 820.25 Abandoned Cables
● 820.26 Spread of Fire or Products of Combustion
● 820.48 Unlisted Cables Entering Buildings
● 820.93 Grounding of the Outer Conductive Shield of
Coaxial Cables
● 820.100 Cable Grounding
● 820.133 Installation of Coaxial Cables and Equipment
● 820.154 Applications of Listed CATV Cables and
CATV Raceways
● 820.179 Coaxial Cables
● 830.2 Definitions
● 830.24 Mechanical Execution of Work
● 830.25 Abandoned Cables
● 830.26 Spread of Fire or Products of Combustion
● 830.93 Grounding or Interruption of Metallic Members
of Network-Powered Broadband Communications Cables
● 830.100 Cable, Network Interface Unit, and Primary
Protector Grounding
● 830.110 Raceways for Low- and Medium-Power
Network-Powered Broadband Communications Cables
● 830.133 Installation of Network-Powered
Broadband Communications Cables and Equipment
● 830.154 Applications of Low-Power Network-
Powered Broadband Communications System Cables
