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Old 01-15-2013, 06:10 PM   #16
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200 amp main throw is arcing


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Originally Posted by rrolleston View Post
Since you have a disconnect outside you need a four wire feed and your neutral and ground need to be separate.

Besides it being a code issue, why do the commons and neutrals need to be seperated? What would that do electrically? The reason I ask is the panel I removed had all grounds shoved into one bar, and it worked just fine. It crossed my mind to seperate them but I didn't purchase any additional bars and the nearest store is 70 miles from here. And if required to seperate them why would there only be 40 ground screws in a 40 circuit panel, shouldn't there be 80...? Just curious...

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Old 01-15-2013, 10:52 PM   #17
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200 amp main throw is arcing


The grounding conductor is not allowed to carry current. If you were to lose a neutral connection the metal of the panel could end up energized. With a ground and a floating neutral that would be isolated if it happens. With your panel you could add a ground bar to both sides of the panel and just move your grounds off to the sides onto the ground bar. And connect the two ground bars with some ground wire.

You would also have to remove your bonding screw from the panel.
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Old 01-15-2013, 11:10 PM   #18
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200 amp main throw is arcing


Okay, not that I'm doubting you, I just want to understand... Then why do some panels (a few square d panels I looked at) literally had the common and neutral lugs on the same unbondable buss right next to each other?
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Old 01-15-2013, 11:24 PM   #19
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200 amp main throw is arcing


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Okay, not that I'm doubting you, I just want to understand... Then why do some panels (a few square d panels I looked at) literally had the common and neutral lugs on the same unbondable buss right next to each other?
Some have them both on there and they have a screw you set in or a wire that connects to the metal of the panel and then to the bar. And some panels are not made usable as sub panels without adding the proper grounding or neutral bars.
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Old 01-16-2013, 01:14 AM   #20
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200 amp main throw is arcing


Thank you for the clairification...

The first chance I get - I will purchase additional bars and get them installed and seperate the grounds, thanks again...
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Old 01-16-2013, 01:27 AM   #21
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200 amp main throw is arcing


For 200 amp you just need #4 al for a ground and make sure you have two ground rods and a water main ground
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Old 01-16-2013, 09:45 AM   #22
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200 amp main throw is arcing


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Originally Posted by rrolleston
For 200 amp you just need #4 al for a ground and make sure you have two ground rods and a water main ground
You dont know if the sub panel is in same house or detatched

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Old 01-16-2013, 09:48 AM   #23
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200 amp main throw is arcing


Thanks

Last edited by Kodyb; 01-16-2013 at 09:53 AM.
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Old 01-16-2013, 09:50 AM   #24
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200 amp main throw is arcing


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Originally Posted by rrolleston View Post
For 200 amp you just need #4 al for a ground and make sure you have two ground rods and a water main ground
Thanks!! I appreciate the constructive input...

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