Definitions cont'd - hdbk10920269

DOE-HDBK-1092-98

Disconnecting (or Isolating) switch--(Over 600 volts, nominal.) A mechanical switching device

used for isolating a circuit or equipment from a source of power.

Dry location--See "Location."

Electric sign--A fixed, stationary, or portable self-contained, electrically illuminated utilization

equipment with words or symbols designed to convey information or attract attention.

Enclosed--Surrounded by a case, housing, fence or walls which will prevent persons from

accidentally contacting energized parts.

Enclosure--The case or housing of apparatus, or the fence or walls surrounding an installation to

prevent personnel from accidentally contacting energized parts, or to protect the equipment from

physical damage.

Equipment--A general term including material, fittings, devices, appliances, fixtures, apparatus,

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

Equipment grounding conductor--See "Grounding conductor, equipment."

Explosion-proof apparatus--Apparatus enclosed in a case that is capable of withstanding an

explosion of a specified gas or vapor which may occur within it and of preventing the ignition of a

specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor

within, and which operates at such an external temperature that it will not ignite a surrounding

flammable atmosphere.

Exposed--(As applied to live parts.) Capable of being inadvertently touched or approached nearer

than a safe distance by a person. It is applied to parts not suitably guarded, isolated, or insulated. (See

"Accessible." and "Concealed.")

Exposed--(As applied to wiring methods.) On or attached to the surface or behind panels designed

to allow access. [See "Accessible. (As applied to wiring methods.)"]

Exposed--(For the purposes of 1910.308(e), Communications systems.) Where the circuit is in such

a position that in case of failure of supports or insulation, contact with another circuit may result.

Externally operable--Capable of being operated without exposing the operator to contact with live

parts.

Feeder--All circuit conductors between the service equipment, or the generator switchboard of an

isolated plant, and the final branch-circuit overcurrent device.

Fitting--An accessory such as a locknut, bushing, or other part of a wiring system that is intended

primarily to perform a mechanical rather than an electrical function.

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