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  1. #1
    Join Date
    Mar 2009
    Location
    Charlottesville, Va.
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    292

    Default could this be the panel bonding screw

    What do you think, could the screw I've arrowed in the attached photo be the main panel bonding screw in this older Cutler Hammer Panel ? The screw does not have very good contact to the busbar but it is the only device I can see that could possibly be considered. I'm leaning towards reporting no visible bonding device but wanted to get a second opinion or two.

    Thanks.

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  2. #2
    Join Date
    Mar 2007
    Location
    Philadelphia PA
    Posts
    3,177

    Default Re: could this be the panel bonding screw

    The screw you indicate looks similar to the one on the bottom right which appears to be passing through plastic, in which case it probably ain't the bonding screw.
    That hole just above your arrow looks like a possible location for a bonding screw.

    "There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
    www.ArnoldHomeInspections.com

  3. #3
    Join Date
    Mar 2009
    Location
    Charlottesville, Va.
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    292

    Default Re: could this be the panel bonding screw

    I agree, it does look similar except for the star washer under the screw in the bottom right. There is another screw in the upper left, that you cannot see in the pic, which is identical to the one in the bottom right. The star washers suggest to me that those two screws are for fastening the plastic isolator to the panel case.

    That hole does look like the location you'd expect to see the bonding screw, except the hole is not threaded and the plastic isolator is behind that hole preventing any screw inserted from contacting the panel case.

    I'm not sure what that screw I've pointed to does....if it's not the bonding screw and it's not helping to secure the plastic isolator...what is it for?


  4. #4
    Join Date
    Mar 2007
    Location
    Spring Hill (Nashville), TN
    Posts
    5,847

    Default Re: could this be the panel bonding screw

    I do not see a proper bonding screw or strap on that panel. I would report it as such. With that type of configuration I think you would be more inclined to see a bonding strap over a screw.

    Is that the service equipment panel?

    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  5. #5
    Join Date
    Aug 2008
    Location
    Maryland
    Posts
    1,898

    Default Re: could this be the panel bonding screw

    The location of the bonding means is typically shown on the panel label. Often times as a black dot in the buss arrangement.


  6. #6
    Join Date
    Mar 2009
    Location
    Charlottesville, Va.
    Posts
    292

    Default Re: could this be the panel bonding screw

    Quote Originally Posted by Jim Port View Post
    The location of the bonding means is typically shown on the panel label. Often times as a black dot in the buss arrangement.
    I didn't know that....thanks...

    Quote Originally Posted by Scott Patterson View Post
    I do not see a proper bonding screw or strap on that panel. I would report it as such. With that type of configuration I think you would be more inclined to see a bonding strap over a screw.

    Is that the service equipment panel?
    Yes, sorry...


  7. #7
    Join Date
    Mar 2007
    Location
    georgia
    Posts
    112

    Default Re: could this be the panel bonding screw

    That could be the bond screw seems to me that crouse-hinds made panels were the screw was just to the side of the bar and the screw would thread into the back of the panel and the head would catch the bar.


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