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Another air compressor wiring question

Discussion in 'Electrical Engineering' started by Bud LeCompte, Jan 12, 2004.

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  1. Bud LeCompte

    Bud LeCompte Guest

    I need a little help. I bought a 7.0 hp, 80 gallon, 240V, single phase air
    compressor last week. When it got here I connected a heavy duty appliance
    cord to it and plugged it into a 240V outlet. It fired up right away and
    ran for an hour to break it in per the owner's manual. No problems. I
    wanted to install a switch so I didn't have to unplug it when I didn't want
    it to run. I went and bought a 60 amp, 240V safety switch thinking that
    would be adequate. I wired up the safety switch but when I turn it on it
    trips the breaker on my breaker panel. I thought, and this is probably
    where my mistake is, that the 240V circuit ran through a 40 amp breaker. I
    thought I would be alright with a 60 amp safety switch. Turns out it's
    *two* 40 amp breakers. I've got it wired from the outlet->heavy duty
    appliance cord->safety switch->8 ga. wire->pressure switch on the
    compressor. The manual said to use 8 gauge wire to the pressure switch.
    What's the best way to install a switch between the outlet and the
    compressor? Do I need a higher amp rating safety switch? I'm 99.9% sure
    I've got everything connected right and grounded properly.

  2. Bud LeCompte

    Bud LeCompte Guest

    Never mind. I got it working. It was that 0.1%.

  3. PCK

    PCK Guest

    that motor needs a contactor and thermal protection at least
    i would also fuse it at the isolation switch
    bet that pressure switch gets real hot
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