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I had a licensed electrician replace my main panel and also install a subpanel in my garage. At the time I knew nothing about electrical, and now I know just barely more than nothing. I have recently learned that the ground bar and neutral bar should be bonded. I have examined both my main and subpanels and determined my bars are not bonded. Should the ground bars in both my main and subpanels be connected?

Subpanel:Subpanel

Main Panel:Main Panel

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Neutral and ground should only be bonded at the service equipment. This could be at the service drop, the meter, or the service disconnect (250.24(A)(1)).

Looks like the neutral is bonded in your main panel, via the bonding screw.

enter image description here

The second panel is then fed using four wires, to keep ground and neutral separate.

enter image description here

  • How does that bonding screw connect to the bus bar used for grounds over on the right-hand side of the box? Through the box itself? – Johnny Apr 15 '16 at 0:32
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    @Johnny It's connected to the bar that ties into the main neutral line. See the original image and look towards the center. – TFK Apr 15 '16 at 3:51
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    Johnny, it goes all the way through and screws into the metal housing. – Kris Apr 16 '16 at 9:22
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    The metal housing is the ground path. I think it's a weak ground path, I would "belt and suspenders" with a bit of ground wire between bars. – Harper Nov 12 '17 at 7:54

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