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Thread: portable generator bonding

  1. #11
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    Quote Originally Posted by infinity View Post
    You would end up with a parallel neutral in the cord set. Not much would happen.
    Then why is it taboo? Or am I not understanding the code correctly?
    Cheers and Stay Safe,

    Marky the Sparky

  2. #12
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    Tennessee NEC:2008
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    It will not let the GFCI set.
    If you aim at nothing, you will hit it every time!

  3. #13
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    Quote Originally Posted by K8MHZ View Post
    Then why is it taboo? Or am I not understanding the code correctly?
    It is similar to other cases where you re-bond the neutral. As a general rule, under the NEC, we don't do that because we don't want objectionable current on metal parts.

    It is not always a big deal with portable generators because usually you have a rubber cord that connects it to the house so you are not putting neutral current on any metal that is not supposed to carry current. One time it does cause a problem is what Bill mentioned when you have ground fault protection.
    Once in a while you get shown the light
    In the strangest of places if you look at it right. Robert Hunter

  4. #14
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    Quote Originally Posted by K8MHZ View Post
    What is the worst thing that could happen as a result of having the N-G bond at both the generator and the service panel?
    Not much. But if the outlets on the genset are GFI they won't stay on with the N/G bond in it.
    Sometimes I don't know whether I'm the boxer or the bag.

  5. #15
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    Quote Originally Posted by qcroanoke View Post
    Not much. But if the outlets on the genset are GFI they won't stay on with the N/G bond in it.
    Let me correct that slightly:

    If there are GFCI outlets on the generator, the GFCI will trip if there are loads downstream of the outlet and there is an N-G bond downstream of the GFCI as well as an N-G bond upstream of the GFCI.

    If there is an N-G bond upstream but not downstream it should not trip the GFCI.
    The problem comes when you run a non-SDS configuration at the transfer switch or remote load on the generator and that lets the generator circuit see that downstream bond.

  6. #16
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    Mike Holt would have a graphic done.
    Moderator-Washington State
    Ancora Imparo

  7. #17
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    Quote Originally Posted by GoldDigger View Post
    Let me correct that slightly:

    If there are GFCI outlets on the generator, the GFCI will trip if there are loads downstream of the outlet and there is an N-G bond downstream of the GFCI as well as an N-G bond upstream of the GFCI.

    If there is an N-G bond upstream but not downstream it should not trip the GFCI.
    The problem comes when you run a non-SDS configuration at the transfer switch or remote load on the generator and that lets the generator circuit see that downstream bond.
    Correct, I left out the bond in the service......
    Sometimes I don't know whether I'm the boxer or the bag.

  8. #18
    Join Date
    Feb 2005
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    Neutral to Ground Bond

    If using a portable generator for portable applications the generator should have a bonded neutral to ground at the generator?

    I just read both instruction manuals for the HONDA EU2000i and the EU3000is inverter generators which are primarily used for portable applications and the neutral is NOT bonded in the generator.

    Both Honda generators do NOT have a GFCI protected receptacle outlet on the generator and if one uses a portable GFCI cord inline with the tool or appliance used, the GFCI would not operate without that neutral to ground bond?

    Shouldn't these generators be bonded internally?

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