Definitions cont'd - hdbk10920279

DOE-HDBK-1092-98

Deenergized--Free from any electrical connection to a source of potential difference and from

electric charge; not having a potential different from that of the earth.

Note: The term is used only with reference to current-carrying parts, which are sometimes energized

(alive).

Designated employee (designated person)--An employee (or person) who is designated by the

employer to perform specific duties under the terms of this section and who is knowledgeable in the

construction and operation of the equipment and the hazards involved.

Electric line truck--A truck used to transport personnel, tools, and material for electric supply line

work.

Electric supply equipment--Equipment that produces, modifies, regulates, controls, or safeguards

a supply of electric energy.

Electric supply lines--(See Lines, electric supply.)

Electric utility--An organization responsible for the installation, operation, or maintenance of an

electric supply system.

Enclosed space--A working space, such as a manhole, vault, tunnel, or shaft, that has a limited means

of egress or entry, that is designed for periodic employee entry under normal operating conditions,

and that under normal conditions does not contain a hazardous atmosphere, but that may contain a

hazardous atmosphere under abnormal conditions.

NOTE: Spaces that are enclosed but not designed for employee entry under normal operating

conditions are not considered to be enclosed spaces for the purposes of this section. Similarly,

spaces that are enclosed and that are expected to contain a hazardous atmosphere are not

considered to be enclosed spaces for the purposes of this section. Such spaces meet the definition

of permit spaces in 1910.146 of this Part, and entry into them must be performed in accordance

with that standard.

Energized (alive, live)--Electrically connected to a source of potential difference, or electrically

charged so as to have a potential significantly different from that of earth in the vicinity.

Energy isolating device--A physical device that prevents the transmission or release of energy,

including, but not limited to, the following: a manually operated electric circuit breaker, a disconnect

switch, a manually operated switch, a slide gate, a slip blind, a line valve, blocks, and any similar

device with a visible indication of the position of the device. (Push buttons, selector switches, and

other control-circuit-type devices are not energy isolating devices.)

Energy source--Any electrical, mechanical, hydraulic, pneumatic, chemical, nuclear, thermal, or

other energy source that could cause injury to personnel.

Equipment (electric)--A general term including material, fittings, devices, appliances, fixtures,

apparatus, and the like used as part of or in connection with an electrical installation.

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