ANSI=IEEE Std. C57.19.00  defines an electrical bushing as ‘‘an insulating structure, including a
through conductor or providing a central passage for such a conductor, with provision for mounting a
barrier, conducting or otherwise, for the purpose of insulating the conductor from the barrier and
conducting current from one side of the barrier to the other.’’ As a less formal explanation, the purpose
of an electrical bushing is simply to transmit electrical power in or out of enclosures, i.e., barriers, of an
electrical apparatus such as transformers, circuit breakers, shunt reactors, and power capacitors. The
bushing conductor may take the form of a conductor built directly as a part of the bushing or,
alternatively, as a separate conductor that is drawn through, usually through the center of, the bushing.