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Old 02-23-2010, 09:45 AM   #1
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Subpanel Neutral Bar Separation


I have an older QO-Square D eight circuit panel. It is being used as a subpanel and when installed was not bonded.
The neutral bar consists of a bar mounted with one screw and a second bar mounted to it by standoffs. This second bar is where the bonding screw is. I can see no way to separate these two bars for proper bonding. There is no provision for mounting this second bar.
I wish I could post a picture but I will have to work on that.
I am thinking I will have to purchase a new panel but can't understand why neutral and ground cannot be separated.
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Old 02-23-2010, 09:56 AM   #2
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Quote:
Originally Posted by Giles View Post
I have an older QO-Square D eight circuit panel. It is being used as a subpanel and when installed was not bonded.
The neutral bar consists of a bar mounted with one screw and a second bar mounted to it by standoffs. This second bar is where the bonding screw is. I can see no way to separate these two bars for proper bonding. There is no provision for mounting this second bar.
I wish I could post a picture but I will have to work on that.
I am thinking I will have to purchase a new panel but can't understand why neutral and ground cannot be separated.
Which way is it, bonded or not? Square D uses a green head screw to bond the buss to the enclsoure.

There are also raised threaded bumps to install auxillary grounding bars.
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Old 02-23-2010, 10:24 AM   #3
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Originally Posted by Jim Port View Post
Which way is it, bonded or not? Square D uses a green head screw to bond the buss to the enclsoure.

There are also raised threaded bumps to install auxillary grounding bars.
Jim--I have looked at the panel several times and even removed the neutral buss. There is no place to mount a bar. It is bonded, but not properly, the way I understand bonding.
This is a sub., mounted about 6" from main panel. With this setup, neutral and ground are all connected together and bonded with housing.
I plan to separate the neutral and ground and bond the ground and add a fourth wire to run to the main panel neutral from the ground.
Is this correct.

Sure wish I could post a picture!
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Old 02-23-2010, 10:41 AM   #4
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What is the panel model number? FWIW I don't every remember a Sq D that did not have raised bumps for a ground buss. Look for a small christmas tree symbol.
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Old 02-23-2010, 11:04 AM   #5
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Originally Posted by Jim Port View Post
What is the panel model number? FWIW I don't every remember a Sq D that did not have raised bumps for a ground buss. Look for a small christmas tree symbol.
Cat. No. QOB 8 Series L4
A stenciled number EI8H9761

While getting these numbers I noticed a raised rectangular area about 1/2"x 1/4" with an unthreaded hole. There are two, one on either side. I was looking for two mounting points and if this is the mounting point, I can thread and use the bonding screw for mounting.
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Old 02-23-2010, 12:24 PM   #6
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Quote:
Originally Posted by Giles View Post
I have an older QO-Square D eight circuit panel. It is being used as a subpanel and when installed was not bonded.
The neutral bar consists of a bar mounted with one screw and a second bar mounted to it by standoffs. This second bar is where the bonding screw is. I.
How is the second bar connected to the first bar, or is it?

I would have thought that the first bar is for grounds and is bonded to the panel by its one screw self tapped into the back of the panel, and the second bar is optionally bonded to the panel with the green screw.
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