B-O-N - Bay-O-Net; under-oil expulsion fuse cutout; a device
whose mechanics represent a stab-sheath arrangement to hold an
expulsion fuse; a device that provides a simple means of replacing
an internal under-oil fuse in the field.
Back-up Current Limiting Fuse - A current-limiting fuse capable
of interrupting all currents from its rated maximum interrupting
current down to its rated minimum interrupting current as specified
by the manufacturer; defined by ANSI C37.40-1981 or latest issue.
Basic Insulation Level (BIL) - a reference insulation level
expressed as the impulse crest voltage of the nominal 1.2 X 50
microsecond wave. This is a measure of the ability of the insulation
to withstand very high voltage surges.
Bathroom - A room containing bathing or showering facilities
and may also contain a wash basin(s) and/or water closet(s).
Battery - a device with the ability to store
a long term DC charge:
Sealed Cell - a storage battery that has no
provision for the addition of water or electrolyte or for
the external measurement of electrolyte specific gravity.
Storage - a battery consisting of more than
one rechargeable cell of the lead-acid, alkaline, or other
Bonding - A low impedance path obtained by permanently joining
all non-current-carrying metal parts to assure electrical continuity
and having the capacity to conduct safely any current likely to
be imposed on it.
Bonding Conductor - A conductor which connects the non-current-carrying
parts of electrical equipment, raceways, or enclosures to the service
equipment or system grounding conductor.
Box Connector - See definition for Connector.
Branch Circuit - The portion of the wiring installation between
the final overcurrent device protecting the circuit and the outlet(s).
Breakdown Voltage - Voltage at which material fails.
Building - A structure which stands alone or which is cut off
from adjoining structures by fire-walls, unpierced or with openings,
protected by approved fire-doors.
Bus - A conductor which serves as a common connection for the
corresponding conductors of two or more circuits.
Busway - A raceway consisting of metal troughing (including
elbows, tees, crosses, in addition to straight runs) containing
conductors, the conductors being supported on insulators.