IEEE Std 3004.5-2014 pdf download – IEEE Recommended Practice for the Application of Low-Voltage Circuit Breakers in Industrial and Commercial Power Systems.
adjustable circuit breaker: A circuit breaker that has adjustable time/current tripping characteristics. These may include inverse-time (such as continuous current, long time, and/or short time), instantaneous, and ground-fault. (adapted from UL 489) alarm switch: A switch that operates to open or close a circuit upon the automatic opening of the circuit breaker with which it is associated. (adapted from UL 489) 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. NOTE—The phrase authority having jurisdiction or its acronym, AHJ, is used in NFPA documents in a broad manner since jurisdictions and approval agencies vary, as do their responsibilities. Where public safety is primary, the authority having jurisdiction may be a federal, state, local, or other regional department or individual such as a fire chief; fire marshal; chief of a fire prevention bureau, labor department, or health department; building official; electrical inspector; or others having statutory authority. For insurance purposes, an insurance inspection department, rating bureau, or other insurance company representative may be the authority having jurisdiction. In many circumstances, the property owner or his or her designated agent assumes the role of the authority having jurisdiction; at government installations, the commanding officer or departmental official may be the authority having jurisdiction. auxiliary switch: A switch that operates to open or close an auxiliary (control) circuit upon the opening, closing, or tripping of the circuit breaker with which it is associated. (adapted from UL 489) NOTE—Auxiliary switch contacts are classified as a, b, aa, bb, LC, etc., for the purpose of specifying definite contact positions with respect to the main device.
available short-circuit current: (at a given point in a circuit) The maximum current that the power system can deliver through a given circuit to any negligible-impedance short circuit applied at the given point, or at any other point that will cause the highest current to flow through the given point. See also: prospective fault current. circuit breaker: A device designed to open and close a circuit by non-automatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating. (adapted from the NEC) Syn: low-voltage circuit breaker. continuous load: A load where the maximum current is expected to continue for three hours or more. (adapted from the NEC)