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A generator interlock kit is a device to allow safe backfeeding of a home through a portable generator during power outages. This eliminates unsafe generator backfeeding situations that could potentially electrocute electric power company workers or destroy the generator.
The interlock kit is installed on the front cover of the breaker panel. It consists of two sliding metal or plastic plates held together by three bolts. When moved down, the plate blocks the generator backfeed circuit breaker and allows the main breaker to remain on . When moved up, the generator backfeed circuit breaker may be turned on but the main circuit breaker is blocked and will remain off. As a result, electricity from the generator cannot travel through the panel and back into the wiring on the street.