Electrical Definitions


 Copyright - Durand & Associates  

Electrical Definitions

Letter - B


An auxiliary electrical device for fluorescent and other discharge light sources.



A device for turning chemical energy into electrical energy.


Bonding (Bonded) The permanent joining of metallic parts to form an electrically conductive path that ensures electrical continuity and the capacity to conduct safely any current likely to be imposed.


Bonding Bushing A conduit bushing that has conductor terminal use to bond the conduit.


Bonding Jumper A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected.


Booster A generator inserted in series in a circuit to add or subtract from the circuit voltage. 


Branch Circuit The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s).


Breaker Tie

A metal device used to connect one or more circuit breaker handles so that they switch at the same time.



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.



A structure that stands alone or that is cut off from adjoining structures by fire walls with all openings therein protected by approved fire doors. 



A heavy rigid conductor used for high voltage feeders.



A nickname for armored cable.