Definitions Applicable to 29 CFR 1910.269

DOE-HDBK-1092-2004

DEFINITIONS APPLICABLE TO 29 CFR 1910.269

Affected employee--An employee whose job requires him or her to operate or use a machine or

equipment on which servicing or maintenance is being performed under lockout or tagout, or

whose job requires him or her to work in an area in which such servicing or maintenance is

being performed.

Attendant--An employee assigned to remain immediately outside the entrance to an enclosed

or other space to render assistance as needed to employees inside the space.

Authorized employee--An employee who locks out or tags out machines or equipment in order

to perform servicing or maintenance on that machine or equipment. An affected employee

becomes an authorized employee when that employee's duties include performing servicing or

maintenance covered under this section.

Automatic circuit recloser--A self-controlled device for interrupting and reclosing an alternating

current circuit with a predetermined sequence of opening and reclosing followed by resetting,

hold-closed, or lockout operation.

Barricade--A physical obstruction such as tapes, cones, or A-frame type wood or metal

structures intended to provide a warning about and to limit access to a hazardous area.

Barrier--A physical obstruction which is intended to prevent contact with energized lines or

equipment or to prevent unauthorized access to a work area.

Bond--The electrical interconnection of conductive parts designed to maintain a common

electrical potential.

Bus--A conductor or a group of conductors that serve as a common connection for two or more

circuits.

Bushing--An insulating structure, including a through conductor or providing a passageway for

such a conductor, with provision for mounting on a barrier, conducting or otherwise, for the

purposes of insulating the conductor from the barrier and conducting current from one side of

the barrier to the other.

Cable--A conductor with insulation, or a stranded conductor with or without insulation and other

coverings (single-conductor cable), or a combination of conductors insulated from one another

(multiple-conductor cable).

Cable sheath--A conductive protective covering applied to cables.

NOTE: A cable sheath may consist of multiple layers of which one or more is conductive.

Circuit--A conductor or system of conductors through which an electric current is intended to

flow.

Clearance (between objects)--The clear distance between two objects measured surface to

surface.

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