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  1. #1
    Join Date
    Mar 2007
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    Chicago, IL
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    Default Bonding at panel attached to generator transfers switch

    Service panel w/ adjacent "load-side" panel used to contain breakers for circuits being transferred. See attached pictures.

    Service equipment is at left, additional panel at center, transfer switch is at right,

    Bonding jumper is installed in center panel.

    Is there a reason inherent in the use of this panel with a transfer switch which requires neutral to be bonded to ground?

    Don't see many of these, and any other comments or observations about this setup are appreciated.

    - Thanks

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    Michael Thomas
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  2. #2
    Join Date
    Mar 2007
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    Default Re: Bonding at panel attached to generator transfers switch

    Anyone?

    Michael Thomas
    Paragon Property Services Inc., Chicago IL
    http://paragoninspects.com

  3. #3
    Roger Frazee's Avatar
    Roger Frazee Guest

    Default Re: Bonding at panel attached to generator transfers switch

    Quote Originally Posted by Michael Thomas View Post
    Anyone?
    Hi Mike

    Have to make a quick reply, so here goes ... that bonding jumper should be removed from the center generator panel. Emt is serving as your equipment grounding so no bond in that center panel or neutral current will use the emt and bonded metal to return to the service equipment and then the source (transformer). The transfer panel appears to be fed from a double breaker in the service equipment so it is out of the picture as being the service equipment in itself. Essentially you have 4 wire feeders from the service equipment to both the transfer panel and generator panel when considering the EMT so no bonding to neutral in either of those panels. You also need four wires to the generator. That's how I see things but I wouldn't take my analysis to the bank. I don't believe the auto transfer switch shown switches the neutral so that the generator becomes separately derived.

    Would be best to have the installation checked by a qualified person IMO but based on what I see there is no way you would want that bond in the center panel.
    .


  4. #4
    Join Date
    Mar 2007
    Location
    Lake Barrington, IL
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    1,363

    Default Re: Bonding at panel attached to generator transfers switch

    Quote Originally Posted by Michael Thomas View Post
    Is there a reason inherent in the use of this panel with a transfer switch which requires neutral to be bonded to ground?
    No, other than the installer was unfamiliar with the proper installation.

    Eric Barker, ACI
    Lake Barrington, IL

  5. #5
    James Duffin's Avatar
    James Duffin Guest

    Default Re: Bonding at panel attached to generator transfers switch

    See attached picture for more information...

    Attached Files Attached Files

  6. #6
    Join Date
    Mar 2007
    Location
    Chicago, IL
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    2,797

    Default Re: Bonding at panel attached to generator transfers switch

    Thanks for the responses!

    Michael Thomas
    Paragon Property Services Inc., Chicago IL
    http://paragoninspects.com

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