Definitions Applicable to 29 CFR 1926 Subpart K cont'd

DOE-HDBK-1092-2004

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--

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.

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.

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.

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.

Ventilated--Provided with a means to permit circulation of air sufficient to remove an excess of

heat, fumes, or vapors.

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