Circuit breaker cont'd - hdbk109220040238

DOE-HDBK-1092-2004

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

moving while completely assembled.

Nonmetallic-sheathed cable--Nonmetallic-sheathed cable is a factory assembly of two or

more insulated conductors having an outer sheath of moisture resistant, flame-retardant,

nonmetallic material. Nonmetallic sheathed cable is manufactured in the following types:

Type NM--The overall covering has a flame-retardant and moisture-resistant finish.

ii. Type NMC--The overall covering is flame-retardant, moisture-resistant, fungus-resistant,

and corrosion-resistant.

Oil (filled) cutout--(Over 600 volts, nominal.) A cutout in which all or part of the fuse support

and its fuse link or disconnecting blade are mounted in oil with complete immersion of the

contacts and the fusible portion of the conducting element (fuse link), so that arc interruption

by severing of the fuse link or by opening of the contacts will occur under oil.

Open wiring on insulators--Open wiring on insulators is an exposed wiring method using

cleats, knobs, tubes, and flexible tubing for the protection and support of single insulated

conductors run in or on buildings, and not concealed by the building structure.

Outlet--A point on the wiring system at which current is taken to supply utilization equipment.

Outline lighting--An arrangement of incandescent lamps or electric discharge tubing to outline

or call attention to certain features such as the shape of a building or the decoration of a

window.

Oven, wall-mounted--An oven for cooking purposes designed for mounting in or on a wall or

other surface and consisting of one of more heating elements, internal wiring, and built-in or

separately mountable controls. (See "Cooking unit, counter-mounted.")

Overcurrent--Any current in excess of the rated current of equipment or the ampacity of a

conductor. It may result from overload (see definition), short circuit, or ground fault. A current in

excess of rating may be accommodated by certain equipment and conductors for a given set of

conditions. Hence the rules for overcurrent protection are specific for particular situations.

Overload--Operation of equipment in excess of normal, full load rating, or of a conductor in

excess of rated ampacity which, when it persists for a sufficient length of time, would cause

damage or dangerous overheating. A fault, such as a short circuit or ground fault, is not an

overload. (See "Overcurrent.")

Panelboard--A single panel or group of panel units designed for assembly in the form of a

single panel; including buses, automatic overcurrent devices, and with or without switches for

the control of light, heat, or power circuits; designed to be placed in a cabinet or cutout box

placed in or against a wall or partition and accessible only from the front. (See "Switchboard.")

Permanently installed decorative fountains and reflection pools--Those that are constructed in

the ground, on the ground or in a building in such a manner that the pool cannot be readily

disassembled for storage and are served by electrical circuits of any nature. These units are

primarily constructed for their aesthetic value and not intended for swimming or wading.

B-12