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sethc 02-18-2008 08:18 AM

subpanel
 
does a subpanel in a house need separate ground rods

jerryh3 02-18-2008 08:21 AM

Doesn't your tag line say you're an electrician?

sethc 02-18-2008 08:24 AM

I need a quick answer I am in the code book now i have been a commercial electrician for 14 years and in commercial work all subpanels need a separate steel ground not sure about residential SA

HouseHelper 02-18-2008 08:51 AM

Quote:

Originally Posted by sethc (Post 98898)
does a subpanel in a house need separate ground rods

If the subpanel is inside the same structure as the main panel, it does not need a separate ground rod, but it does need to be fed by four wires (H,H,N,G). It does not have to have its own disconnect.
If the subpanel is in a separate structure, it must have a grounding electrode (rod), its own disconnect, and preferably be fed by four wires.

sethc 02-18-2008 08:55 AM

thanks for the answer house helper

jerryh3 02-18-2008 08:57 AM

Quote:

Originally Posted by HouseHelper (Post 98905)
If the subpanel is inside the same structure as the main panel, it does not need a separate ground rod, but it does need to be fed by four wires (H,H,N,G). It does not have to have its own disconnect.
If the subpanel is in a separate structure, it must have a grounding electrode (rod), its own disconnect, and preferably be fed by four wires.

What is the rule with disconnects? If the sub panel only has six breakers, is a disconnect still required at the outbuilding?

InPhase277 02-18-2008 10:44 PM

Quote:

Originally Posted by jerryh3 (Post 98908)
What is the rule with disconnects? If the sub panel only has six breakers, is a disconnect still required at the outbuilding?

No, but only if it isn't considered a lighting and appliance branch circuit panel.

InPhase277

chris75 02-18-2008 11:27 PM

Quote:

Originally Posted by InPhase277 (Post 99216)
No, but only if it isn't considered a lighting and appliance branch circuit panel.

InPhase277


Which is going away in the 2008 edition... :)


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