Bonding Big J-box

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jeff43222

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Minneapolis, Minnesota
I'm working on a 150A heavy up and have a question about bonding. I replaced the old fuse box with a 10"x10" j-box since I mounted the new panel about a foot to the right of where the old stuff was. Most of the old circuits are spliced in the new j-box. The circuits are: five 15A, one 20A, and one 50A.

My brain is too tired to remember what size wire I'm supposed to use to bond the j-box, and my code book is in the truck.
 
Re: Bonding Big J-box

If you've used a metallic conduit than your bonding is done. If not, than you would size the EGC according to the largest overcurrent device serving your circuits. In this case it would be for the 50 amp or a #10 cu conductor.
 
Re: Bonding Big J-box

Yeah, I had a feeling the #6 Cu feeding the range would affect the size of the grounding conductor, but I wanted to double check before I wired it up.

I didn't use metal conduit between the panel and the new j-box. I had some scrap 2" PVC lying around, so I used that. Brain also too tired to do conduit fill calcs, so I just used something I knew was plenty big, not to mention easy to pull wires through.
 
Re: Bonding Big J-box

Your one other concern would be the length of the 2" conduit. You said about a foot. As long as it's 24" or less than derating would not apply so you'll be safe with simply extending the existing conductors size for size.
 
Re: Bonding Big J-box

Jeff, remember to use a bolt and tapped hole or a nut-n-bolt to attach the #10 EGC's lug to the box, and not a sheet-metal screw.
 
Re: Bonding Big J-box

The boxes I used came with built-in raised holes and grounding screws, so I think I should be safe. I just talked to the inspector the other day, and he green-tagged my work.

I never use sheet metal screws or other non-approved means to ground stuff.
 
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