• HereIAm@lemmy.world
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    2 个月前

    I will just regurgitate what I’ve heard. I think they are used in case power goes out and you have a generator. You need to disconnect from the power grid first, but it should then allow you to power tour house with the generator. It sounds more like a US thing.

    • jubilationtcornpone@sh.itjust.works
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      2 个月前

      Yes, this would technically work. Although, it would only power the hot leg the outlet is connected to which only feeds part of the house.

      It’s very dangerous for a variety of reasons. Especially if you forget to shut off the mains breaker. The transformer can backfeed power down the line at line voltages, creating a shock hazard for lineman or anyone else who might have contact with the line.

      • LH0ezVT@sh.itjust.works
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        2 个月前

        Wouldn’t any repair worker ground anything they work on first, or assume it is live? I am not even a proper electrician, but “short-circuited and grounded, or treat it as live” has been the rule forever.

        • originaltnavn@lemm.ee
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          2 个月前

          Not an electrician, but I would imagine the danger being if the technician checked the wire was off locally, started work and then the home generator starts feeding mid work.