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Ballast
An auxiliary electrical device for fluorescent and other discharge light sources.
Battery
A device used to store electrical energy.
Two or more primary or secondary cells connected together electrically. The
term does not apply to a single cell.
Bonding Jumper
A permanent joining of metallic parts to
form an electrically conducive path to ensure electrical continuity and
capacity to safely conduct and current likely to be imposed.
A bare or insulated conductor used to ensure the required electrical
conductivity between metal parts required to be electrically connected.
Frequently used from a bonding bushing to the service equipment enclosure to
provide a path around concentric knockouts in an enclosure wall: also used
to bond one raceway to another.
Branch Circuit
The circuit conductors between the
final overcurrent device (breaker or fuse) protecting the circuit and
the outlet.
Brownout
A reduction in voltage and/or power
when demand for electricity exceeds generating capacity. The term
brownout is misleading because customers generally do not notice the
reduction, except when it affects sensitive electronic equipment.
BTU
British Thermal Unit. Energy required to raise one pound
of water one degree Fahrenheit. One pound of water at 32 degrees F requires
the transfer of 144 BTUs to freeze into solid ice.
Buck- Boost Transformer
A small, low voltage transformer placed in series with
the power line to increase or reduce steady state voltage.
Bus Bar
A primary power distribution point
connected to the main power source.
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