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  1. #1
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    Default Bonding screw and a jumper in A secondary electrical panel

    Is this allowed in secondary (aka Sub-panel) Should the bonding screw be removed for a secondary panel and I cant figure out why this copper jumper at bottom left is linking the ground bus bar to the neutral bus bar (service wires were in metal conduit, if that makes a difference) ??



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  2. #2
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    Default Re: Bonding screw and a jumper in A secondary electrical panel

    First, that copper jumper is a factory piece which is installed to bond both sets of terminal bars to serve as neutral terminal bars instead of just the terminal bar with the neutral conductor in it.

    Are you sure that is not "the" service equipment panel? (That there is a main service disconnect someplace else.)

    Second, if you are sure that is not the service equipment panel, then not only does that screw need to be removed, but that bare ground conductor needs to be removed from the neutral terminal buss and connected to a grounding terminal attached to the panel enclosure.

    And I would need to look at it on my computer, not just on my phone.

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

  3. #3
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    Default Re: Bonding screw and a jumper in A secondary electrical panel

    I suspect that whoever installed that panel "thought" it was service equipment.

    Would be better if the overall photo was closer (but still shows the entire panel) and higher resolution/better focus (to see things better, even on the computer).

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

  4. #4
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    Default Re: Bonding screw and a jumper in A secondary electrical panel

    Quote Originally Posted by Jerry Peck View Post
    I suspect that whoever installed that panel "thought" it was service equipment.

    Would be better if the overall photo was closer (but still shows the entire panel) and higher resolution/better focus (to see things better, even on the computer).
    Good stuff- Thanks
    The neutrals and grounds are separated (2 neutral bars are bonded together with the factory strap -with 2 installed ground bars one at bottom left and one at top right), yes its a secondary panel. Service wires come out of meter base into a disconnect box, i couldn't get it open because it was rusted and had been painted over several times. I was talking about a copper jumper at the bottom left that connects the ground bus to the neutral bus , why are they connecting this (not talking about the factory bonding strap) What all the bonding to the metal conduit at bottom center ? (panel has no state inspector sticker) I may have to go back and try to open panel outside that was painted shut to be able to determine if panel is a Main or not)

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    Last edited by Sam Morris; 01-31-2018 at 10:13 PM.

  5. #5

    Default Re: Bonding screw and a jumper in A secondary electrical panel

    Looks like the installer went one step to far. Should be OK if the bonding screw and wire from neutral to separate grounding bar are removed. Should have a grounding bushing on the conduit with a #6 or larger bonding wire to the grounding strip.


  6. #6
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    Default Re: Bonding screw and a jumper in A secondary electrical panel

    "*I was talking about a copper jumper at the bottom left that connects the ground bus to the neutral bus"

    That's what I was referring to with:
    "but that bare ground conductor needs to be removed from the neutral terminal buss"

    I couldn't tell if that was a jumper to the ground terminal bar, or if it was a conductor which went down and was hidden behind those other wires.

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

  7. #7
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    Default Re: Bonding screw and a jumper in A secondary electrical panel

    Quote Originally Posted by Jerry Peck View Post
    "*I was talking about a copper jumper at the bottom left that connects the ground bus to the neutral bus"

    That's what I was referring to with:
    "but that bare ground conductor needs to be removed from the neutral terminal buss"

    I couldn't tell if that was a jumper to the ground terminal bar, or if it was a conductor which went down and was hidden behind those other wires.
    Thank You Sir, your the best


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