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.

All circuit conductors between the service equipment, or the generator switchboard of an isolate plant, and the final branch-circuit overcurrent device.

Capable of being inadvertently touched or approached nearer than a safe by a person. It is applied to parts not suitably guarded, isolated, or insulated.

The sum of the continuous ratings of the load consuming apparatus connected to the system or any part thereof.

A load where the maximum current is expected to continue for three hours or more.

The unit of luminous flux. It is equal to the flux through a unit solid angle (steradian) from a uniform point source of one candle, or to the flux on a unit surface all points of which are at unit distance from a uniform point source of one candle.

Any shaft way, hatchway, well hole, or other vertical opening or space in which an elevator or dumbwaiter is designed to operate.

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.

Utilization equipment, generally other than industrial, normally built in standardized sizes or types, which is installed or connected as a unit to perform one or more functions such as clothes washing, air conditioning, food mixing, deep frying, etc.

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.

The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s).

So constructed that dust will not enter the enclosing case under specified test conditions.

So constructed or protected that dust will not interfere with its successful operation.

One or more rooms for the use of one or more persons as a housekeeping unit with space for eating, living and sleeping and permanent provisions for cooking and sanitation.

A disruptive discharge around or over the surface of a solid or liquid insulator.

The highest current at rated voltage that an over current protective device intended to interrupt under standard test conditions.

_____ is the largest of all the demands which have occurred during the specified period of time.

Approved steel or metal troughing (usually with removable cover), and fitting therefore, so formed and constructed that insulated conductors may be readily drawn in and withdrawn, or laid in and removed, without injury either to conductor or covering.

A general term covering an assembly or assemblies of devices for the interruption, control, metering of electric power.

A large single panel, frame, or assembly of panels on which are mounted, on the face or back or both, switches, overcurrent and other protective devices, buses, and usually instruments.

A sudden upward transient variation in the current, potential or power.

The _____ of a circuit of a system or circuit is a nominal value assigned to a system of a circuit of a given voltage class for the purpose of convenient designation.

The conductors and equipment for delivering energy from the electricity supply system to the wiring system of that premises served.

A conductor, a group of conductors, in switchgear assemblies which serves as a common connection for two or more circuits.