Posted by WeirdDeere on June 05, 2014 at 12:11:05 from (199.87.178.160):
Right now my shop is wired for 100 amp service, but it's only 3 wire, I believe 2-2-4 aluminum, through 2 inch conduit. I want to add the fourth wire for a dedicated ground for safety.
There is no separate grounding bar in the breaker box. It looks like I can buy that and add it easily. There are no large grounding lugs left in the meter box, I don't think I could get a stranded ground cable into the smaller lugs, but a solid wire should fit. Would it be kosher to use a solid copper bare wire as a ground back to the meter inside my conduit? Then what gauge copper wire would I use to go to a separate grounding rod outside the shed?
After all this, if I remove the green bonding screw and strap from the neutral bar it should be floating and I'll have a separate ground bar?
Thanks for the help. I've got a copy of the NEC but it's really hard to interpret as I'm still learning!
There will probably be more questions but I'll start with this!
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