NEC Definitions

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NEC Definitions
2011-06-22 18:01:12

Section 100 definitions
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  1. Branch Circuit, General-Purpose
    A branch circuit that supplies two or more receptacles or outlets for lighting and appliances.
  2. Branch Circuit, Individual
    A branch circuit that supplies only one utilization equipment.
  3. Branch Circuit, Multiwire
    A branch circuit that consists of 2 or more ungrounded conductors that have a voltage between them, and a grounded conductor that has equal voltage between it and each ungrounded conductor of the circuit and that is connected to the neutral or grounded conductor of the system.
  4. Accessible - Equipment
    Admitting close approach; not guarded by locked doors, elevation, or other affective means
  5. Accessible - Wiring
    Capable of being removed or exposed without damaging the building structure or finish or not permanently closed in by the structure or finish of the building
  6. Accessible, Readily
    Capable of being reached quickly for operation, renewal, or inspections without requiring those to whom ready access is required to climb over or remove obstacles or to resort to portable laddes and so forth.
  7. Ampacity
    The current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
  8. Appliance
    Utilization equipment, generally other than industrial, that is normally built in standardized sizes or types and is installed or connected as a unit to perform one or more functions such as clothes washing, air conditioning, food mixing, deep frying, and so forth.
  9. Approved
    Acceptable to the authority having jurisdiction.
  10. Askarel
    A generic term for a group of nonflammable synthetic chlorinated hydrocarbons used as electrical insulating media.
  11. Attachment Plug (Plug Cap) (Plug)
    A device that, by insertion in a receptacle, establishes a connection between the conductors of the attached flexible cord and the conductors connected permanently to the receptacle.
  12. Authority Having Jurisdiction (AHJ)
    An organization, office, or individual responsible for enforcing the requirements of a code or standard, or for approving equipment, materials, an installation, or a procedure.
  13. Automatic
    Self-acting, operating by its own mechanism when actuated by some impersonal influence, as, for example, a change in current, pressure, temperature, or mechanical configuration.
  14. Bathroom
    An area including a basin with one or more of the following: a toilet, a tub, or a shower.
  15. Bonded (Bonding)
    Connected to establish electrical continuity or conductivity
  16. Bonding Jumper
    A reliable conductor to ensure the required electrical conductivity between metal parts required to be elctrically connected.
  17. Bonding Jumper, Equipment
    The connection between two or more portions of the equipment grounding conductor.
  18. Bonding Jumper, Main
    The connection between the grounded circuit conductor and the equipment grounding conductor at the service.
  19. Branch Circuit
    The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s).
  20. Branch Circuit, Appliance
    A branch circuit that supplies energy to one or more outlets to which appliances are to be connected and that has no permanently connected luminaires that are not part of an appliance.
  21. Branch Circuit Overcurrent Device
    A device capable of providing protection for service, feeder, and branch circuits and equipment over the full range of overcurrents between its rated current and its interrupting rating. Branch circuit overcurrent protective devices are provided with interrupting ratings appropriate for the intended use but no less than 5,000 amperes.
  22. Building
    A structure that stands alone or that is cut off from adjoining structures by fire walls with all openings therein protected by approved fire doors.
  23. Cabinet
    An enclosure that is designed for either surface mounting or flush mounting and is provided with a frame, mat, or trim in which a swinging door or doors are or can be hung.
  24. Circuit Breaker
    A device designed to open and close a circuit by nonautomatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating
  25. Adjustable (Circuit Breaker)
    A qualifying term indicating that the circuit breaker can be set to trip at various values of current, time, or both within a predetermined range.
  26. Instantaneous Trip (Circuit Breaker)
    A qualifying term indicating that no delay is purposely introduced in the tripping action of the circuit breaker.
  27. Inverse Time (Circuit Breaker)
    A qualifying term indicating that there is purposely introduced a delay in the tripping action of the circuit breaker, which delay decreases as the magnitude of the current increases.
  28. Nonadjustable (Circuit Breaker)
    A qualifying term indicating that the circuit breaker does not have any adjustments to alter the value of current at which it will trip or the time required for its operation.
  29. Setting (Circuit Breaker)
    The value of current, time, or both at which an adjustable circuit breaker is set to trip.
  30. Clothes Closet
    A non-habitable room or space intended primarily for storage of garments and apparel.
  31. Communicatons Equipment
    The electronic equipment that performs the telecommunications operation for the transmission of audio, video, and data, and includes power equipment (eg., dc converters, inverters, and batteries) and technical support equipment (eg., computers).
  32. Concealed
    Rendered inaccessible by the structure or finish of the building. Wires in concealed raceways are considered concealed, even though they may become accessible by withdrawing them.
  33. Conductor, Bare
    A conductor having no covering or electrical insulation whatsoever.
  34. Conductor, Covered
    A conductor encased within material of composition or thickness that is not recognized by this code as electrical insulation.
  35. Conductor, Insulated
    A conductor encased within material of composition and thickness that is recognizedby this code as electrical insulation.
  36. Conduit Body
    A seperate portion of a conduit or tubing system that provides access through a removable cover(s) to the interior of the system at a junction of two or more section of the system or at a terminal point of the system.
  37. Connector, Pressure (Solderless)
    A device that establishes a connection between two or more conductors or between one or more conductors and a terminal by means of mechanical pressure and without the use of solder.
  38. Continuous Load
    A load where the maximum current is expected to continue for 3 hours or more.
  39. Controller
    A device or group of devices that serves to govern, in some predetermined manner, the electric power delivered to the apparatus to which it is connected.
  40. Cooking Unit, Counter-Mounted
    A cooking appliance designed for mounting in or on a counter and consisting of one or more heating elements, internal wiring, and built in or mountable controls.
  41. Coordination (Selective)
    Locaization of an overcurrent condition to restrict outages to the circuit or equipment affected, accomplished by the choice of overcurrent protective devices and their ratings or settings.
  42. Copper-Clad Aluminum Conductors
    Conductors drawn from a copper clad aluminium rod with the copper metallurgically bonded to an aluminium core. The copper forms a minimum of 10 percent of the cross sectional area of a solid conductor or each strand of a stranded conductor.