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 mounted).
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 specifications.
Circuit Breaker - a device which detects excessive power demands in a circuit and self-interrupts when they occur.
Classification of Arresters - Arrester classification is determined by prescribed test requirements. These classifications are: station, intermediate, distribution heavy duty, distribution normal duty, distribution light duty, and secondary.
Classifying Current - The designated current used to perform the classification tests.
Companion Fuse - Cooper Power Systems' externally mounted back-up current-limiting fuse. 12K, 25K and 40K ratings are available to coordinate with the same rating K Link.
Conductor - Any material which allows electrons to flow through it.
Conformance Tests - Tests made, when required, to demonstrate selected performance characteristics of a product or representative samples thereof.
Continuous Rating - The constant load which a device can carry at rated primary voltage and frequency without damaging and/or adversely effecting it characteristics.
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.
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 electrolyte.
Creepage Distance - The shortest distance between two conducting parts measured along the surface or joints of the insulating material between them.
Crest Value - The maximum value attained by the peak of a wave, surge or impulse.
CU - Copper.
Current - The movement of electrons through a conductor, measured in amperes.
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; defined by ANSI C37.40-1981 or latest issue.
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; a proposed ANSI C37.4 definition.
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; defined by ANSI C37.40-1981 or latest issue.