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Thread: jumper at main

  1. #1
    Jerome W. Young's Avatar
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    Default jumper at main

    hmmm. i know its wrong but i cant come up with all the reasons.

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  2. #2
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    Default Re: jumper at main

    Three phase panel wired with single phase power.


  3. #3
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    Default Re: jumper at main

    The problem is the lug is only listed for use with one conductor.


  4. #4
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    Default Re: jumper at main

    Quote Originally Posted by Jim Port View Post
    The problem is the lug is only listed for use with one conductor.

    Plus the jumper is too small.

    I also see, top left breaker (100 amp), which supplies SOMETHING and there is no neutral, and it looks like there is another similar cable behind it.

    If that supplies another panel, that feeder needs to have 4 wires: 2-hot, 1-neutral, and 1-ground.

    If that supplies equipment or appliance which is truly only 240 volts (and there is no 120 volt aspect in it), then those should be okay, but at 100 amp ... that is rather large for a single appliance.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  5. #5
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    Default Re: jumper at main

    Even if the wire were properly sized it would still be wrong for the reason I posted.


  6. #6
    Jerome W. Young's Avatar
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    Default Re: jumper at main

    that 100 amp feeds a non service panel whose neutrals and grounds are not floated

    the main service cables are 1/0 copper with a 200 amp block type fuse. lots of things for an electrician to do here.


  7. #7
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    Default Re: jumper at main

    Quote Originally Posted by Jim Port View Post
    Even if the wire were properly sized it would still be wrong for the reason I posted.
    I know, that's why I quoted you and said "Plus ... ".

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  8. #8
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    Default Re: jumper at main

    Quote Originally Posted by Jerome W. Young View Post
    that 100 amp feeds a non service panel whose neutrals and grounds are not floated
    Not allowed.

    Needs to be a 4-wire feeder cable.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

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