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camdvm

08:18AM | 09/23/08
Member Since: 10/17/05
21 lifetime posts
Bvelectrical
Hi,

We have a 1500 sq foot barn on a concrete slab about 200 feet away from our house. The electrical supply is a 40amp breaker with a 8/3 underground cable. I wired the barn myself, but I never put in a specific ground for the barn directly from the barn's breaker box into the earth...

The grounding for the barn is from the barn's breaker through the grounding wire in the 8/3 feed linked into our house's ground. Is this ok? Is it safe? What do you think? Should I add a specific ground for the barn?

Thanks

househelper

01:01PM | 09/24/08
Member Since: 03/31/05
265 lifetime posts
If the barn has its own panel, then it must also have its own grounding electrode. Yes, add a ground rod or two and run the wire back to the grounding bar in the subpanel.

camdvm

06:05AM | 09/25/08
Member Since: 10/17/05
21 lifetime posts
Thanks for the reply,

The subpanel in the barn is currently grounded through the feed from the house - a bare grounding wire in the 8/3 feed is hooked up to the subpanel ground and runs all the way back to the large ground in the home's 200A main panel. I've read that this should be ok - what do you think?

househelper

10:25AM | 09/25/08
Member Since: 03/31/05
265 lifetime posts
The detached building REQUIRES a grounding electrode. The grounding electrode system is there for protection from high voltage (lightning, utility lines). This has nothing to do with the bonding of the subpanel to the main panel, which is what the bare wire in the 8/3 does.
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