Using Generator To Power Well Pump

Discussion in 'Pumps and Tanks Well Forum & Blog' started by Regis Tration, May 1, 2012.

  1. Regis Tration

    Regis Tration New Member

    Messages:
    6
    Location:
    Massachusetts
    I have a Goulds Model 7GS05422 well pump. It is referred to as “2 wire†but has 3 wires actually running to it.

    To power the pump using a 240 volt generator, which wires from the generator should be connected to which wires on the pump motor? The generator has a NEMA L14-30 connector.

    Thank you.
  2. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,066
    Location:
    NW Ontario, Canada
    You should not connect directly to the pump. Connect it to the pressure switch.
  3. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,333
    Location:
    Houston, TX
    NEMA L14-30P AC Plug

    Connect X & Y to Pressure Control, and G to Ground.

    6244.jpg

    Be careful playing with electricity.
  4. Regis Tration

    Regis Tration New Member

    Messages:
    6
    Location:
    Massachusetts
  5. BrianK

    BrianK New Member

    Messages:
    26
    Location:
    Calgary, Alberta, Canada
    The first 2 wires are L1 and L2 (240 VAC between the two), the 3rd wire may be a ground if it's green or if yellow could be the capacitor start wire. You can tell this if you have a control box near the pressure switch/tank and you have 2 wires from your power panel feeding it and the 3 wires from the pump wired into the control box. If the 3rd wire is a ground, it should be obvious as it will be connected to other ground connections somewhere. As recommended above, the proper place to connect the generator power is where power comes to the pressure switch or a junction box near there (or if you have the control box see where it is fed from and connect it there). When you do that you MUST disconnect the normal or line power otherwise if you still have utility power - BOOM and you will probably wreck your generator. If you don't disconnect your normal/utility feed to the pump and you connect the generator, you will also be powering up your house and the line back to the transformer and ultimately the high voltage power line. This is dangerous to the linesmen trying to fix the power outage. (of course this assumes you have utility power)
  6. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,333
    Location:
    Houston, TX
    Good point.

    I assumed it was the only power source.

    Thanks for the Safety precaution. Better to be safe than sorry.


    Be careful playing with electricity, Unless you like a shocking experience.
  7. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,233
    Location:
    Maine
    How many watts is your generator?
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