Terms Flashcards
A cylindrical assembly composed of a conductor centered inside a metallic tube or shield,
separated by a dielectric material, and usually covered by an insulating jacket.
Coaxial Cable
A qualifying term indicating that the circuit breaker does
not have any adjustment to alter the value of current at which it will trip or the time required for its
operation.
Nonadjustable (as applied to circuit breakers)
A cable containing optical fibers and current-carrying electrical
conductor
Composite Optical Fiber Cable
Intermittent operation in which the load conditions are regularly recurrent.
Duty, Periodic
A single unit, providing complete and independent living facilities for one or more
persons, including permanent provisions for living, sleeping, cooking, and sanitation.
Dwelling Unit
Surrounded by a case, housing, fence, or wall(s) that prevents persons from accidentally
contacting energized parts.
Enclosed
A nonmetallic raceway placed within a larger raceway.
Innerduct
Constructed so that moisture will not enter the enclosure under specified test conditions.
Watertight
A manually operated device used in conjunction with a transfer switch to
provide a means of directly connecting load conductors to a power source and of disconnecting the
transfer switch
Switch, Bypass Isolation
An assembly completely enclosed on all sides and top with sheet metal (except for ventilating
openings and inspection windows) and containing primary power circuit switching, interrupting devices,
or both, with buses and connections.
Switchgear
The conductors and equipment for delivering electric energy from the serving utility to the
wiring system of the premises served.
Service
Power conversion equipment that provides a means of adjusting the speed of an
electric motor.
Adjustable Speed Drive
An area including a basin with one or more of the following: a toilet, a tub, or a shower.
Bathroom
A branch circuit that supplies only one utilization equipment.
Branch Circuit, Individual
A load where the maximum current is expected to continue for 3 hours or more.
Continuous Load.
Without live parts exposed to a person on the operating side of the equipment.
Dead Front
An enclosure designed for surface mounting that has swinging doors or covers secured
directly to and telescoping with the walls of the enclosure.
Cutout Box
Enclosures constructed so that dust will not enter the enclosing case under specified test
conditions
Dusttight
A device, or group of devices, or other means by which the conductors of a circuit
can be disconnected from their source of supply.
Disconnecting Means
All circuit conductors between the service equipment, the source of a separately derived system,
or other power supply source and the final branch-circuit overcurrent device.
Feeder
A building or portion of a building in which one or more self-propelled vehicles can be kept for
use, sale, storage, rental, repair, exhibition, or demonstration purposes.
Garage
An electrically conductive path from the point of a ground fault on a
wiring system through normally non-current-carrying conductors, equipment, or the earth to electrical
supply source.
Ground-Fault Current Path
A device that establishes an electrical connection to the earth.
Grounding Electrode
An assembly of two or more components consisting of one of the following:
(1) power circuit components only, such as motor controllers, overload relays, fused disconnect switches,
Industrial Control Panel
The current, in amperes, that a conductor can carry continuously under the conditions of use
without exceeding its temperature rating.
Ampacity
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.
Appliance
Connected to establish electrical continuity and conductivity.
Bonded (Bonding)
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.
Attachment Plug (Plug Cap) (Plug)
Performing a function without the necessity of human intervention.
Automatic
The connection between the grounded circuit conductor and the equipment
grounding conductor at the service.
Bonding Jumper, Main
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.
Cabinet
A structure that stands alone or that is separated from adjoining structures by fire walls.
Building
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.
Circuit Breaker
Equipment that controls dc voltage or dc current, or both, and that is used to charge a
battery or other energy storage device.
Charge Controller
A qualifying term indicating that no delay is
purposely introduced in the tripping action of the circuit breaker.
Instantaneous Trip (as applied to circuit breakers)
The value of current, time, or both, at which an adjustable circuit breaker is
set to trip.
Setting (of circuit breakers)
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.
Concealed
A separate 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 sections of the system or at a terminal
point of the system. Boxes such as FS and FD or larger cast or sheet metal boxes are not classified as
conduit bodies.
Conduit Body
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.
Cooking Unit, Counter-Mounted
