OK Thanks everyone for your thoughtful support. I did visit the AHJ and the lead plan checker did not see any reason to prohibit the work. He will be running it by his field electrical inspector to be sure he agrees as well. I will let you know if they come up with a reason to dis-allow it. Otherwise it's onward and upward. Mark Frye Berkeley Solar Electric Systems 303 Redbud Way Nevada City, CA 95959 (530) 401-8024 <http://www.berkeleysolar.com/> www.berkeleysolar.com
_____ From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Hans Frederickson Sent: Monday, April 18, 2011 3:05 PM To: 'RE-wrenches' Subject: Re: [RE-wrenches] Two Buildings, Two Services, One Roof I don't think you'll find anything in the NEC to prohibit that. NEC 250.52(A)(1) requires you to bond a metal underground water pipe (if it exists) to the grounding electrode system. In older neighborhoods with metal water pipes, the grounding electrode systems for all the houses are bonded together (through the metal water pipe). The only potential problem I know of with the GECs for multiple services bonded together in this way is that if a bad connection develops on the incoming grounded service conductor (neutral), unbalanced (neutral) current can start flowing through the pipes to neighboring services and back to the transformer through their neutral wires. Bottom line: call your AHJ, tell them what you plan to do, and ask them if they have a problem with it. You should also check with the utility. Regards, -Hans
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