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Old 10-27-2012, 09:45 AM   #1
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Bonding Electrical Panel

My first post.
If you look at he attached picture. The home inspector saw that my panel needed bonding screws.
This is a SquareD panel installed in 1979.
I fixed the double tapped Neutrals.
This panel has an exact sister to it right next to this one.
I think this is the First and Main panel Because a Home Inspector only indicated this box was missing bonding screws.

- With that said.
Look at the Neutral Bar - All three bars are connected with a thick steel plate so no neutral or ground could be isolated....

Either way I have been looking up bonding and haven't got a real understanding. On placed looked like you only bond the main box. But the schematic showed the Neutral bonding bar in a sub-panel as isolated see the attached URL

To take a stab at it...
The bonding screw makes contact with the Panel Box Thus grounding it...
---Tangent question I don't understand what the big deal is... Ground/Neutral is Ground/Neutral no matter if you are in a Main or sub box... (Okay lay into me)..

First Question - Do I really need the bonding screw in my panel.
Sub Question - Can you point me to the reasoning to bond or not to bond?
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Old 10-27-2012, 11:58 AM   #2
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The panel enclosure itself always needs to be bonded to ground simply in case a hot conductor touches it. That applies to all panels!! As to bond grounds and neutrals that only is allowed once at the main panel.


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Old 10-27-2012, 12:02 PM   #3
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Only one of those holes is needed for the box bonding screw, IF this is a service panel.

Service panel, by definition would be the first disconnect after the meter box. You said there was another panel next to this one. Does one feed-thru to the other? Or, are they both fed directly from the outside meter box?

An alternative to installing a bonding screw would be to install a grounding lug and bonding jumper wire from the neutral bar to the enclosure can.

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Old 11-02-2012, 11:37 PM   #4
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Bonding Electrical Panel-imag0116.jpglooks similar to mine-trying to locate my bonding screw .did these older square d get installed with a different set up(nothing there at the open spot?)

Last edited by hidden1; 11-02-2012 at 11:46 PM.
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