Connecting Subpanel to Main Panel

tom418May 10, 2012

I'm adding a subpanel onto my GE TM2020CCU. The subpanel most likely will be a GE TLM1212CCU, for the purpose of feeding four electric baseboards (1500w and three 750 watts), and a water heater.

A GE THQL 2160 60-amp double pole breaker in the main panel

will protect the sub.

My questions:

I plan on using a 4 inch long x 1.25 inch offset nipple between the two boxes. I'll be using #4 THHN to connect the two boxes. Should my ground be #4 BARE or Green? (Can it be #6?

Is this a better way to provide ground to the subpanel (as opposed to grounding through the nipple)?

Note: I plan on using grounding bushings on both ends of the offset nipple, to be connected to the ground bars of each box. Yes, I know that the ground and neutral must be isolated from each other in the subpanel :)

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Ron Natalie

Either bare or green is fine. Given the short run, I'd just run a grounding conductor between the two respective ground terminals. You only need a #10 ground here. You only need #6 for the feeder conductors as well.

    Bookmark   May 11, 2012 at 11:25AM
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    Bookmark   May 11, 2012 at 3:48PM
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