I was asked recently why I was using a two-pole contactor to control a 1? 240V motor (versus a marginally cheaper single-pole contactor).
Not using a two-pole contactor feels wrong to me, and from a safety perspective I don't want to not switch any ungrounded conductors--that's the same to me as switching a neutral in a hot-to-neutral circuit.
240-15 says that OCPDs have to open all ungrounded conductors, but I can't think of a code cite that says that a contactor has to.
I think that switching one side of a 240V circuit is former common practice in HVAC systems, but I also think that most everyone stopped doing that several years ago...
Not using a two-pole contactor feels wrong to me, and from a safety perspective I don't want to not switch any ungrounded conductors--that's the same to me as switching a neutral in a hot-to-neutral circuit.
240-15 says that OCPDs have to open all ungrounded conductors, but I can't think of a code cite that says that a contactor has to.
I think that switching one side of a 240V circuit is former common practice in HVAC systems, but I also think that most everyone stopped doing that several years ago...