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Joined: Jul 2004
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The only problem with that analysis is a second building with no bonded metalic paths can become another virtual "main" in respect to bonding the neutral.
Greg Fretwell
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Joined: Aug 2001
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There is certainly a lot to consider over this issue.
Looking at the case of a detached garage fed via 3-wire cable with bonded neutral and ground, is it really much different than two houses fed from the same transformer, each with a bond a the main service?
In fact if the two homes are fed via metallic water pipes from a common system, it could be considered worse, since with metallic pipes to the detached garage you would need the isolated 4-wire feeder.
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Joined: May 2002
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Paul, you are correct, but this is outside of the NEC. (POCO's are under the NESC)
I guess the NEC is trying to keep this potential problem at bay on their side.
Roger
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Pun intended, Roger? ![[Linked Image]](https://www.electrical-contractor.net/ubb/wink.gif)
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Joined: Jul 2004
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As a related issue, have you actually looked at the unbalanced current going into the ground from a pole pig?
I get about 4a on the one in front of my house measuring the 8ga solid coming down the pole. My GEC is contributing a couple amps of that.
Greg Fretwell
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Joined: May 2002
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Paul, actually as much as I want to say yes, I didn't think about it to after I hit the "Submitt Reply" button. ![[Linked Image]](https://www.electrical-contractor.net/ubb/smile.gif) Roger
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Joined: Jun 2003
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Originally posted by gfretwell:
I was the last guy I ever saw using copper and people told me I was screwing up. That's 'cuz you're not supposed to use copper for conduit! ![[Linked Image]](https://www.electrical-contractor.net/ubb/rolleyes.gif) ![[Linked Image]](https://www.electrical-contractor.net/ubb/biggrin.gif)
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Joined: Aug 2001
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Aw, c'mon now..... You can use it for both surely? After you've pulled wires through there's still plenty of room in the pipe for the water to flow....... ![[Linked Image]](https://www.electrical-contractor.net/ubb/eek.gif)
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Joined: Sep 2003
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I would love to find a source of appropriately rated RMC in _brass_, with associated fittings. Not for any current job, but because I have an image of polished brass pipe used for an elegant exposed installation.
-Jon
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Joined: Feb 2002
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Greg,
One house that had problem with pin hole leaks had a problem with the grounding of the house. A plumber friend of mine called me up and told me that one house kept having pin hole leaks. I said, I am an electrician not a plumber. He said, he was running out of ideas and maybe I could come up with something. Long story short, all I could find was a plastic water filter in the middle of the house. It broke the copper water pipe and didn't have a jumper over it. I ask the plumber where the leaks were, front of house or back, he said back only. Put a jumper across the filter and never had a leak since.
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