Definitions cont'd - hdbk10920290

DOE-HDBK-1092-98

specific purpose, environment, or application is determined by a qualified testing laboratory where

such identification includes labeling or listing.

Insulated conductor--See "Conductor."

Interrupter switch--(Over 600 volts, nominal.) A switch capable of making, carrying, and interrupting

specified currents.

Intrinsically safe equipment and associated wiring--Equipment and associated wiring in which any

spark or thermal effect, produced either normally or in specified fault conditions, is incapable, under

certain prescribed test conditions, of causing ignition of a mixture of flammable or combustible

material in air in its most easily ignitable concentration.

Isolated--Not readily accessible to persons unless special means for access are used.

Isolated power system--A system comprising an isolating transformer or its equivalent, a line

isolation monitor, and its ungrounded circuit conductors.

Labeled--Equipment or materials to which has been attached a label, symbol or other identifying

mark of a qualified testing laboratory which indicates compliance with appropriate standards or

performance in a specified manner.

Lighting outlet--An outlet intended for the direct connection of a lampholder, a lighting fixture, or

a pendant cord terminating in a lampholder.

Listed--Equipment or materials included in a list published by a qualified testing laboratory whose

listing states either that the equipment or material meets appropriate standards or has been tested and

found suitable for use in a specified manner.

Location--

a. Damp location--Partially protected locations under canopies, marquees, roofed open porches,

and like locations, and interior locations subject to moderate degrees of moisture, such as some

basements.

b. Dry location--A location not normally subject to dampness or wetness. A location classified as

dry may be temporarily subject to dampness or wetness, as in the case of a building under

construction.

c. Wet location--Installations underground or in concrete slabs or masonry in direct contact with

the earth, and locations subject to saturation with water or other liquids, such as locations

exposed to weather and unprotected.

Mobile X-ray--X-ray equipment mounted on a permanent base with wheels and/or casters for

moving while completely assembled.

Motor control center--An assembly of one or more enclosed sections having a common power bus

and principally containing motor control units.

B-30