Definitions Applicable to 29 CFR Subpart V cont'd

DOE-HDBK-1092-2004

Enclosed--The term means surrounded by a case, cage, or fence, which will protect the

contained equipment and prevent accidental contact of a person with live parts.

Equipment--This is a general term which includes fittings, devices, appliances, fixtures,

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

transmission and distribution system, or communication systems.

Exposed--The term means not isolated or guarded.

Electric supply lines--The term means those conductors used to transmit electric energy and

their necessary supporting or containing structures. Signal lines of more than 400 volts to

ground are always supply lines within the meaning of the rules, and those of less than 400

volts to ground may be considered as supply lines, if so run and operated throughout.

Guarded--The term means protected by personnel, covered, fenced, or enclosed by means of

suitable casings, barrier rails, screens, mats, platforms, or other suitable devices in

accordance with standard barricading techniques designed to prevent dangerous

approach or contact by persons or objects.

NOTE: Wires, which are insulated but not otherwise protected, are not considered as

guarded.

Ground--(Reference). The term means that conductive body, usually earth, to which an

electric potential is referenced.

Ground (as a noun)--The term means a conductive connection whether intentional or

accidental, by which an electric circuit or equipment is connected to reference ground.

Ground (as a verb)--The term means the connecting or establishment of a connection,

whether by intention or accident of an electric circuit or equipment to reference ground.

Grounding electrode (ground electrode)--The term grounding electrode means a conductor

embedded in the earth, used for maintaining ground potential on conductors connected to it,

and for dissipating into the earth current conducted to it.

Grounding electrode resistance--The term means the resistance of the grounding electrode to

earth.

Grounding electrode conductor (grounding conductor)--The term means a conductor used to

connect equipment or the grounded circuit of a wiring system to a grounding electrode.

Grounded conductor--The term means a system or circuit conductor which is intentionally

grounded.

Grounded system--The term means a system of conductors in which at least one conductor or

point (usually the middle wire, or neutral point of transformer or generator windings) is

intentionally grounded, either solidly or through a current--limiting device (not a current--

interrupting device).

B-35