Definitions:(in alphabetical order)
Accessible - (As applied to wiring methods) Capable of being removed or exposed without damaging the building structure or finish, or not permanently closed in by the structure or finish of the building.
Accessible - (as applied to equipment) Admitting close approach: not guarded by locked doors, elevation, or other effective means. (see Accessible, Readily)
Accessible, Readily - (Readily Accessible) Capable of being reached quickly for operation, renewal, or inspections, without requiring those to whom ready access is requisite to climb over or remove obstacles or to resort to portable ladders,chairs,etc.
Ambient Temperature - The temperature of the air, water, or surrounding earth. Conductor ampacity is corrected for changes in ambient temperature including temperatures below 86°F. The cooling effect can increase the current carrying capacity of the conductor. (Review Section 310-10 of the Electrical Code for more understanding)
Ammeter - An electric meter used to measure current, calibrated in amperes.
Ampacity - The current-carrying capacity of conductors or equipment, expressed in amperes.
Ampere - The basic SI unit measuring the quantity of electricity.
Bonding Jumper - A bare or insulated conductor used to ensure the required electrical conductivity between metal parts required to be electrically connected. Frequently used from a bonding bushing to the service equipment enclosure to provide a path around concentric knockouts in an enclosure wall: also used to bond one raceway to another.
Continuity - The state of being whole, unbroken.
Continuos Load - A load where the maximum current is expected to continue for three hours or more. Rating of the branch circuit protection device shall not be less tan 125% of the continuos load.
Demand Factor - For an electrical system or feeder circuit, this is a ratio of the amount of connected load (in kva or amperes) that will be operating at the same time to the total amount of connected load on the circuit. An 80% demand factor, for instance, indicates that only 80% of the connected load on a circuit will ever be operating at the same time. Conductor capacity can be based on that amount of load.
Dustproof - Constructed or protected so that dust will not interfere with its successful operation.
Dusttight - Constructed so that dust will not enter the enclosing case under specified test conditions.
Duty, continuos - A service requirement that demands operation at a substantially constant load for an indefinitely long time.
Duty, intermittent - A service requirement that demands operation for alternate intervals of load and no load, load and rest, or load, no load, and rest.
Duty, periodic - A type of intermittent duty in which the load conditions regularly reoccur.
Duty, short time - A requirement of service that demands operations at a substantially constant load for a short and definitely specified time.
Duty, varying - A requirement of of service that demands operation at loads, and for intervals of time, both of which may be subject to wide variation.
Explosionproof - Designed and constructed to withstand and internal explosion without creating an external explosion or fire.
Feeder - A circuit, such as conductors in conduit or a busway run, which carries a large block of power from the service equipment to a sub-feeder panel or a branch circuit panel or to some point at which the block power is broken into smaller circuits.
Ground - A large conducting body (as the earth) used as a common return for an electric circuit and as an arbitrary zero of potential.
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