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Thread: Back up generator

  1. #1
    Join Date
    Dec 2008
    Posts
    215

    Back up generator

    Back up generator has a three prong 240 v. receptacle. Two hots and a ground. I want to plug in a #10 3 wire cord from a transfer switch and power a 120/240 v. panel. Is it OK to use the existing neutral in the panel for 120 v. loads?

  2. #2
    Join Date
    Feb 2003
    Location
    New Jersey
    Posts
    3,727
    Yes, if you’re using an interlock kit to prevent back-feed to the utility. You also have to make sure the 120-240V outlet on the generator is not GFCI protected otherwise it will trip the breaker on the generator as soon as you plug it in.

  3. #3
    Join Date
    Jan 2011
    Location
    United States
    Posts
    7,859
    Your gen needs a neutral- hot-hot-neutral-ground.
    I'm in over my head...

  4. #4
    Join Date
    Nov 2003
    Location
    Roanoke, VA.
    Posts
    4,558
    Quote Originally Posted by mbrooke View Post
    Your gen needs a neutral- hot-hot-neutral-ground.
    It must be an old generator. I haven't seen one with a 3 wire 240 vac receptacle in a long time.
    Sometimes I don't know whether I'm the boxer or the bag.

  5. #5
    Join Date
    Jan 2011
    Location
    United States
    Posts
    7,859
    Quote Originally Posted by qcroanoke View Post
    It must be an old generator. I haven't seen one with a 3 wire 240 vac receptacle in a long time.
    I agree, and as such it can only serve line-line 240 volt loads. That is unless its a 3 pole 3 wire outlet... But I can't see that being complaint.
    I'm in over my head...

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