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Reference.org
Bushing (electrical)
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<p>In <a href="/facts/Electric_power/w61ID9yQ">electric power</a>, a bushing is a hollow electrical <a href="/facts/Insulator_(electricity)/SfSXkrh5">insulator</a> that allows an electrical conductor to pass safely through a conducting barrier such as the case of a transformer or circuit breaker without making electrical contact with it. Bushings are typically made from <a href="/facts/Porcelain/deuLm3sb">porcelain</a>, though other insulating materials are also used. </p>