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240 volt compressor wiring

Discussion in 'Electrical Engineering' started by GunninGopher, Oct 19, 2003.

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  1. GunninGopher

    GunninGopher Guest

    I have a 240 volt hot tub with a 50 amp circuit going to it and would like
    to use the same wire run to power a 240 volt single phase air compressor.

    I want to make sure, obviously, that I don't damage either unit, so I want
    to get this right.

    As I understand it, the compressor's 2 "Line" leads are going to be the 2
    "hot" ones, and I won't use the neutral (white) wire to hook up to it. My
    spa has all 3 wires (plus the ground) going into the panel.

    Will I have a problem if I "T" off the 2 hot leads to the compressor? I
    don't really have much money and would like to avoid hiring an electrician
    to do this, but I will if I must. I do a lot of the basic electrical work
    here at my house, so I have no problem making the connections, just
    understanding the different voltages when they get over 120v.

    BTW I live in the US, if that makes a difference.

    Also, what is the recommended way to put a switch on the compressor circuit?
  2. SQLit

    SQLit Guest


    First check the amp draw on the compressor. 50 might be a tad high for
    protecting the motor on the compressor.

    Do you have a panel/junction box at the location where you want to do this?
    If so you could tap into the connections there and then add your new box
    with a reduced breaker sized for the compressor or just a outlet for the

    Just suggestions.
  3. Dave M.

    Dave M. Guest

    He *should* add a separate branch circuit (I used10-3 romex and a 30 amp
    breaker for my 240 volt unit). I regret not running 10-4, because I later
    had to power a light, contactor and it's control circuits using a near-by
    120 volt branch.

    Dave M.

    Dave M.
  4. Dave M.

    Dave M. Guest

    He *should* add a separate branch circuit (I used10-3 romex and a 30 amp
    Sorry... It should be 10-2 and 10-3 Romex.

    Dave M.
  5. GunninGopher

    GunninGopher Guest

    OK. I hadn't considered that. You're saying that I should add a sub-panel
    there and split the compressor off on a 15 amp circuit, since that is what
    it is rated for. Good idea, I guess. That would solve the switch problem
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