Sub-Panel Bonding

[Inspector Will]

I recently came across a sub-panel which appeared to be manufactured for a main panel use. A metal bar bonded the neutral and ground buses across the top of the panel. However, since it was utilized as a sub-panel the installer cut the bar that bonded the neutrals and grounds (see photos). It was clear that there was no alternate path that bonded the neutrals and grounds. Does anyone see a problem with this since there is no bond between the neutral and ground. Thanks for any feedback.

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[Neal Lewis]

Is the right side ground bus bonded to the enclosure?

[Jim Baird]

Neutral should be isolated in sub.

[Jim Katen]

I recently came across a sub-panel which appeared to be manufactured for a main panel use. A metal bar bonded the neutral and ground buses across the top of the panel. However, since it was utilized as a sub-panel the installer cut the bar that bonded the neutrals and grounds (see photos). It was clear that there was no alternate path that bonded the neutrals and grounds. Does anyone see a problem with this since there is no bond between the neutral and ground. Thanks for any feedback.

I'm pretty sure that Square D doesn't include instructions that tell you to cut the bar. If there isn't a way to isolate one of the terminal bars, you usually have to buy an accessory grounding bar kit if you're going to put this load center downstream of the main disconnect.

That said, if the left terminal bar is isolated from the cabinet, it's probably fine. I can see a green bonding screw at the top of the right bar.

- Jim Katen, Oregon