Cabinet - An enclosure of adequate mechanical strength, composed
entirely of noncombustible and absorption-resistant material, designed
either for surface or flush mounting, and provided with a frame,
mat, or trim, in which swinging doors are hung.
Cable Tray - A raceway consisting of troughing, and fittings therefore,
so formed and constructed that insulated conductors and cables
may be readily installed or removed after the cable tray has been
completely installed, without injury either to conductors or their
Ladder Cable Tray - A prefabricated structure consisting of
two longitudinal side rail(s)connected by individual transverse
members, with openings exceeding 50 mm in a longitudinal direction.
Nonventilated Cable Tray - A prefabricated structure without
openings within the integral or separate longitudinal side rails.
Ventilated Cable Tray - A prefabricated structure consisting
of a ventilated bottom within integral longitudinal side rails
with no openings exceeding 50 mm in a longitudinal direction.
Capacitor - An electrical device used to store electrical energy,
and to release it back into the power system when required.
Capacitor Bank - A collection of individual capacitor units grouped
to form a particular Kvar and Voltage rating. "Banks" may
be either pole mounted, substation mounted, or metal enclosed (pad
Cell - One of the hollow spaces, suitable for use as a raceway,
of a cellular metal or cellular concrete floor, the axis of the
cell being parallel to the longitudinal axis of the floor members.
Cellular Floor - An assembly of cellular metal or cellular concrete
floor members, consisting of units with hollow spaces (cells)
suitable for use as raceways and, in some cases, non-cellular units.
Certification Test - Tests run on a regular periodic basis to
verify that selected, key performance characteristics of a product
or representative samples thereof have remained within performance
Circuit - that
portion of a wiring installation which
is connected to the load side terminals of an AC or DC system
and forms a complete path(s) through which
electrical current is normally intended to flow, including utilization
equipment. For example, a cable connecting
the load side terminals of a three-phase circuit breaker up to
and including utilization equipment is generally
considered to be a circuit, as would be a similar three-wire single-phase
Circuit Breaker - a device which detects excessive power demands
in a circuit and self-interrupts when they occur.
Instantaneous-Trip Circuit Breaker - A circuit breaker designed
to trip only under short circuit conditions.
Communication Circuit - A circuit which is part of a communication
Communication System - An electrical system whereby voice, sound,
or data may be received and/or transmitted, and includes telephone,
telegraph, data communications, intercommunications, paging systems,
wired music systems, and other systems of similar nature, but excludes
alarm systems such as fire, smoke or intrusion, radio and television
broadcast communication equipment, closed circuit television, or
community antenna television systems.
Community Antenna Distribution System - A distribution system
of coaxial cable together with any necessary amplifiers or other
equipment, which is used to transmit television or radio frequency
signals typical of a community antenna television (CATV) system.
Concealed - Rendered permanently inaccessible by the structure
or finish of the building.
Conductor - A wire or cable, or other form of metal, installed
for the purpose of conveying electric current from one piece of
electrical equipment to another or to ground.
Conduit - A raceway of circular cross-section into which it is
intended that conductors be drawn and the term includes rigid conduit
(metal and nonmetallic) and flexible metal conduit:
Flexible metal conduit - A metal conduit which may be easily
bent without the use of tools
Liquid-tight flexible conduit -
(a) a flexible metal conduit having an outer liquid-tight jacket; or
(b) a flexible liquid-tight nonmetallic conduit.
Rigid conduit - A rigid conduit of metal or a nonmetallic material.
Rigid HFT conduit - A rigid nonmetallic conduit of halogen-free
Rigid metal conduit - A rigid conduit of metal made to the
same dimensions as standard pipe and suitable for threading with
standard pipe threads.
Rigid nonmetallic conduit - A rigid conduit of nonmetallic
material which is not permitted to be threaded.
Rigid PVC conduit - A rigid nonmetallic conduit of unplasticized
Rigid RE conduit - A rigid nonmetallic conduit of reinforced
thermoset material suitable for direct burial or encasement in
Rigid Type DB2/ES2 PVC conduit - A rigid nonmetallic conduit
of PVC for direct burial or encasement in concrete or masonry.
Rigid Type EB1 PVC conduit - A rigid nonmetallic conduit of
PVC for encasement in concrete or masonry.
Box connector - A device for securing a cable, via its sheath
or armour, where it enters an enclosure such as an outlet box.
Wire connector - A device which connects two or more conductors
together or one or more conductors to a terminal point for the
purpose of connecting electrical circuits.
Continuous Duty - see definition for Duty.
Continuous Rating - The constant load which a device can carry
at rated primary voltage and frequency without damaging and/or
adversely effecting it characteristics.
Control Circuit - The circuit which carries the electric signals
directing the performance of a control device, but does not carry
the power which the device controls.
Controller - A device or a group of devices for controlling in
some predetermined manner the electric power delivered to the apparatus
to which it is connected.
Coordination - The process of selecting fuses and/or breakers
or reclosers with specific time current characteristics, so a fault
will be cleared by the downline (protecting) device before the
upline (protected) can melt or lockout; the act or state of providing
harmonious adjustment of functioning devices.
Cord Set - An assembly consisting of a suitable length of flexible
cord or power supply cable provided with an attachment plug at
one end and a cord connector at the other end.
Corona - A phenomenon associated with high voltage. Appears as
a bluish-purple glow on the surface of and adjacent to a conductor
when the voltage gradient exceeds a certain critical value, producing
light, audible noise and ozone (O3).
Correlation - Selection of the proper transformer fuse; the process
of selecting fuses having specific characteristics in accordance
with specific protection or load criteria.
Creep - Continued deformation of material under stress.
Creepage - The travel of electrolyte up the surface of the electrode
or other parts of the cell above the level of the main body of
Creepage Distance - The shortest distance between two conducting
parts measured along the surface or joints of the insulating material
Crest Value - The maximum value attained by the peak of a wave,
surge or impulse.
CSA - Canadian Standards Association.
CU - Copper.
Current - The movement of electrons through a conductor, measured
Current Interrupter - Any device that will open a circuit after
sensing an abnormal high-circuit condition; a general name given
to all types of fuses, reclosers and breakers.
Current-Limiting Fuse, Back-up - A current-limiting fuse capable
of interrupting all currents from its rated maximum interrupting
current down to its rated minimum interrupting current as specified
by the manufacturer.
Current-Limiting Fuse, Full Range - A current-limiting fuse capable
of interrupting all currents from the maximum rated interrupting
current down to the minimum continuous current that causes melting
or the fusible element(s), when the fuse is applied at maximum
ambient temperature specified by the fuse manufacturer.
Current-Limiting Fuse, General Purpose - A current-limiting fuse
capable of interrupting all currents from its rated maximum interrupting
current down to that current which causes melting or the fusible
element in one hour.
Current-Permit - Written permission from the inspection department
to a supply authority to the effect that electric energy may be
supplied to a particular installation.
Cutout Box - An enclosure of adequate mechanical strength, composed
entirely of noncombustible and absorption-resistant material, designed
for surface mounting, and having swinging doors or covers secured
directly to, and telescoping with, the walls of the box proper.