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businmike 05-31-2008 12:25 PM

Grounding circuits in barn
I am going to run 2 20 amp circuits to my barn which is 75' from the load center at the house. One will be a 240V circuit for my sprinkler pump and the other will be a 120v for lighting and a couple outlets.

I am planning on running conduit from the load center to the barn and will use #12 THHN. My question is what to do about grounding the sprinkler pump. It is connected to a 14' driven well via steel pipe. Should I connect the pump to the ground wire I run from the load center or does the well casing act as a ground?

I don't want to end up bonding the load center to the well casing with a 75' #12 wire.

Also since this is a steel pole building should I bond the ground to the barn itself?

NateHanson 06-01-2008 09:12 AM

I don't think you can run a 110v and 220v circuit to a separate structure without putting a subpanel out there (I forget the exact rule - isn't it something like 2 110v circuits is ok but any more and you have to install a panel?). Might be cheaper anyways to run 4 conductors to a panel in the barn, rather than the 6 you'd have to run as you have it planned. Plus if you want to add more circuits in the barn later, you won't have to pull more wire.

joed 06-01-2008 09:22 AM

Under code you can not run two circuits to a detached building. To do what you are planning requires a sub panel to be installed in the barn,

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