NFPA 70 Article 100 Definitions with Complete Solutions

NFPA 70 Article 100 Definitions with Complete Solutions Ampacity - Answer-The maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. Appliance - Answer-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 Branch Circuit - Answer-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 a part of an appliance. Approved - Answer-Acceptable to the authority having jurisdiction. Arc-Fault Circuit Interrupter (AFCI) - Answer-A device intended to provide protection from the effects of arc faults by recognizing characteristics unique to arcing and by functioning to de-energize the circuit when an arc fault is detected. Authority Having Jurisdiction (AHJ) - Answer-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. Bonded (Bonding) - Answer-Connected to establish electrical continuity and conductivity. Main Bonding Jumper - Answer-The connection between the grounded circuit conductor and the equipment grounding conductor at the service. System Bonding Jumper - Answer-The connection between the grounded circuit conductor and the supply-side bonding jumper, or the equipment grounding conductor, or both, at a separately derived system. Branch Circuit - Answer-The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s). Building - Answer-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. Cabinet - Answer-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. Circuit Breaker - Answer-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. Concealed - Answer-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. Continuous Duty - Answer-Operation at a substantially constant load for an indefinitely long time. Continuous Load - Answer-A load where the maximum current is expected to continue for 3 hours or more. Controller - Answer-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. Cutout Box - Answer-An enclosure designed for surface mounting that has swinging doors or covers secured directly to and telescoping with the walls of the box proper. Dead Front - Answer-Without live parts exposed to a person on the operating side of the equipment. Device - Answer-A unit of an electrical system that carries or controls electric energy as its principal function. Disconnecting Means - Answer-A device, or group of devices, or other means by which the conductors of a circuit can be disconnected from their source of supply. Dusttight - Answer-Constructed so that dust will not enter the enclosing case under specified test conditions. Intermittent Duty - Answer-Operation for alternate intervals of (1) load and no load; or (2) load and rest; or (3) load, no load, and rest. Periodic Duty - Answer-Intermittent operation in which the load conditions are regularly recurrent. Dwelling Unit - Answer-A single unit, providing complete and independent living facilities for one or more persons, including permanent provisions for living, sleeping, cooking, and sanitation. Enclosed - Answer-Surrounded by a case, housing, fence, or wall(s) that prevents persons from accidentally contacting energized parts. Enclosure - Answer-The case or housing of apparatus, or the fence or walls surrounding an installation to prevent personnel from accidentally contacting energized parts or to protect the equipment from physical damage. Energized - Answer-Electrically connected to, or is, a source of voltage. Equipment - Answer-A general term, including fittings, devices, appliances, luminaires, apparatus, machinery, and the like used as a part of, or in connection with, an electrical installation. Explosionproof Equipment - Answer-Equipment enclosed in a case that is capable of withstanding an explosion of a specified gas or vapor that may occur within it and of preventing the ignition of a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within, and that operates at such an external temperature that a surrounding flammable atmosphere will not be ignited thereby. Exposed (live parts) - Answer-Capable of being inadvertently touched or approached nearer than a safe distance by a person. It is applied to parts that are not suitably guarded, isolated, or insulated. Exposed (wiring) - Answer-On or attached to the surface or behind panels designed to allow access. Externally Operable - Answer-Capable of being operated without exposing the operator to contact with live parts. Feeder - Answer-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. Festoon Lighting - Answer-A string of outdoor lights that is suspended between two points. Fitting - Answer-An accessory such as a locknut, bushing, or other part of a wiring system that is intended primarily to perform a mechanical rather than an electrical function. Ground Fault - Answer-An unintentional, electrically conducting connection between an ungrounded conductor of an electrical circuit and the normally non-current-carrying conductors, metallic enclosures, metallic raceways, metallic equipment, or earth. Grounded (Grounding) - Answer-Connected to ground or to a conductive body that extends the ground connection. Grounded Conductor - Answer-A system or circuit conductor that is intentionally grounded. Accessible (Equipment) - Answer-Admitting close approach; not guarded by locked doors, elevation, or other effective means.