Definitions cont'd - hdbk10920293

DOE-HDBK-1092-98

Service-entrance conductors, underground system--The service conductors between the terminals

of the service equipment and the point of connection to the service lateral. Where service equipment

is located outside the building walls, there may be no service-entrance conductors, or they may be

entirely outside the building.

Service equipment--The necessary equipment, usually consisting of a circuit breaker or switch and

fuses, and their accessories, located near the point of entrance of supply conductors to a building or

other structure, or an otherwise defined area, and intended to constitute the main control and means

of cutoff of the supply.

Service raceway--The raceway that encloses the service-entrance conductors.

Signaling circuit--Any electric circuit that energizes signaling equipment.

Switchboard--A large single panel, frame, or assembly of panels which have switches, buses,

instruments, overcurrent and other protective devices mounted on the face or back or both.

Switchboards are generally accessible from the rear as well as from the front and are not intended

to be installed in cabinets. (See "Panelboard.")

Switches--

a. General-use switch--A switch intended for use in general distribution and branch circuits. It is

rated in amperes, and it is capable of interrupting its rated current at its rated voltage.

b. General-use snap switch--A form of general-use switch so constructed that it can be installed

in flush device boxes or on outlet box covers, or otherwise used in conjunction with wiring

systems recognized by this subpart.

c. Isolating switch--A switch intended for isolating an electric circuit from the source of power.

It has no interrupting rating, and it is intended to be operated only after the circuit has been opened

by some other means.

d. Motor-circuit switch--A switch, rated in horsepower, capable of interrupting the maximum

operating overload current of a motor of the same horsepower rating as the switch at the rated

voltage.

Switching devices--(Over 600 volts, nominal.) Devices designed to close and/or open one or more

electric circuits. Included in this category are circuit breakers, cutouts, disconnecting (or isolating)

switches, disconnecting means, and interrupter switches.

Transportable X-ray--X-ray equipment installed in a vehicle or that may readily be disassembled

for transport in a vehicle.

Utilization equipment--Utilization equipment means equipment which utilizes electric energy for

mechanical, chemical, heating, lighting, or similar useful purpose.

Utilization system--A utilization system is a system which provides electric power and light for

employee workplaces, and includes the premises wiring system and utilization equipment.

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