I’m a helper and worked with an old time electrician and he did something a year ago that still troubles me. We wired a 50 amp 220 volt circuit for some heat pumps. he brought the wires into the panel, hooked them to ground and the breaker and left the white wire capped with a wire nut. He told me it will work fine and forget about it. Did we leave somebody with an open neutral? Is the ground wire the neutral now? Should I try and go back and fix this?

  • pbbananaman@lemmy.world
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    1 year ago

    Maybe I’m missing something but 220 doesn’t need a neutral, just 2 hots. Maybe if you were wiring up a NEMA outlet with a neutral connection that would be bad, but a direct wire to an appliance sounds fine?

    • dual_sport_dork 🐧🗡️@lemmy.world
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      1 year ago

      This is correct. Direct connection to a 220/240 appliance takes two hots – one each from opposite ends of the phase – and a ground. No neutral is required. (You may even find a sticker inside the wiring panel to the effect of, “Do not connect any neutral wire.” The mini split I just installed had one, for instance.)

      Some people treat ground and neutral as interchangeable since in residential applications with only a single breaker panel they are often bonded at the panel anyhow. While you can get away with this in a variety of scenarios, doing so is not technically correct.

      • bobs_monkey@lemm.ee
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        1 year ago

        It’s the same idea, except with two legs of single phase instead of 3 legs of three phase. A lot of HVAC equipment is centered around some kind of motor, and they’ll typically have some kind of transformer to derive control voltage.