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Old 03-07-2009, 07:42 AM   #1
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Sub panel ground bar installation


My new Cutler -Hammer subpanel came w/o a ground bar,so I picked one up yesterday. Can this be installed on the same side as the neutral bar? They claim holes are provided but the only ones I see are on the neutral bar side. I know that grounds and neutrals must be kept apart in a subpanel.

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Old 03-07-2009, 07:47 AM   #2
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Sub panel ground bar installation


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My new Cutler -Hammer subpanel came w/o a ground bar,so I picked one up yesterday. Can this be installed on the same side as the neutral bar? They claim holes are provided but the only ones I see are on the neutral bar side. I know that grounds and neutrals must be kept apart in a subpanel.
Sure.

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Old 03-07-2009, 07:50 AM   #3
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Sub panel ground bar installation


Thanks for the quick response. I'm in the middle of doing this and wanted to make sure.
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Old 03-07-2009, 07:55 AM   #4
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Sub panel ground bar installation


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Thanks for the quick response. I'm in the middle of doing this and wanted to make sure.
Usually panels have factory holes in more than one location, but I am more familiar with SquareD than CH.
As long as the ground bar is bonded to the panel, and the neutral bar isn't, and the neutrals and grounds are kept separate, you are OK.
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Old 03-07-2009, 10:13 AM   #5
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Sub panel ground bar installation


You got a ground terminal bar designed to fit your panel right?
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Old 03-07-2009, 07:41 PM   #6
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Sub panel ground bar installation


I have the same panelboard and there are no holes on the one side (left). I think if you drill some holes and use machine screw to attach (make contact) you should be fine. I think a torque wrench is need to a certain tightness is required by NEC.
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Old 03-08-2009, 11:31 AM   #7
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Sub panel ground bar installation


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I have the same panelboard and there are no holes on the one side (left). I think if you drill some holes and use machine screw to attach (make contact) you should be fine. I think a torque wrench is need to a certain tightness is required by NEC.
Not a good idea. You cannot modify the panel. It will lose it's listing. While what you propose seems safe and I would do it if I had too, it's better to stick with only accessories designed for that particular panel.

Note: Many panels have a bar connecting two terminal bars. One on each side. Remove the bar, install the bonding screw in the one you will use for the grounds and then you have equal amounts of neutral and ground terminals. It does not matter on a main service panel. You can mix nuetrals and grounds there. But not in sub panels. Take a peek.

Last edited by J. V.; 03-08-2009 at 11:34 AM.
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Old 03-08-2009, 04:09 PM   #8
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Sub panel ground bar installation


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Not a good idea. You cannot modify the panel. It will lose it's listing. While what you propose seems safe and I would do it if I had too, it's better to stick with only accessories designed for that particular panel.

Note: Many panels have a bar connecting two terminal bars. One on each side. Remove the bar, install the bonding screw in the one you will use for the grounds and then you have equal amounts of neutral and ground terminals. It does not matter on a main service panel. You can mix nuetrals and grounds there. But not in sub panels. Take a peek.


Here is the picture of the panel I have. There are not manufacture holes for the ground buss. I have the Ground Buss (accessories) designed for the panel. Any suggestions.


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Old 03-08-2009, 09:32 PM   #9
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Sub panel ground bar installation


Heres what Ive seen recently. A sub panel and the main panel are side by side with the main being grounded to the water feed to the home along with a bare ground wire to a grounding spike and the sub being grounded to the same underground grounding spike.

The questions are, is this right and why cant ground wires and neutrals go on the same bar in the sub panel?

Thanks in advance.
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Old 03-08-2009, 09:46 PM   #10
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Sub panel ground bar installation


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Originally Posted by II Weeks View Post
Heres what Ive seen recently. A sub panel and the main panel are side by side with the main being grounded to the water feed to the home along with a bare ground wire to a grounding spike and the sub being grounded to the same underground grounding spike.

The questions are, is this right and why cant ground wires and neutrals go on the same bar in the sub panel?

Thanks in advance.
In the situation you describe you do not bond neutral and ground at the sub panel because you will have neutral current on both the feeder ground and the feeder neutral as it returns to the source.

You also would not bond the sub panel to the same ground rod as the service equipment next to it, it would be pointless.
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Old 03-10-2009, 10:45 AM   #11
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Sub panel ground bar installation


What is recommended if there are no holes for ground buss?

Thanks in advance
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Old 03-10-2009, 09:06 PM   #12
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Sub panel ground bar installation


Drill and tap, no worries. Ground lugs are drilled to cans, transformers etc. all the time.

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