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
_____ From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Mark Frye Sent: Monday, April 18, 2011 2:05 PM To: 'RE-wrenches' Subject: Re: [RE-wrenches] Two Buildings, Two Services, One Roof Or another way to illustrate this problem: There is nothing in the Code that would stop me from hauling out the old #6 and bonding my GEC to my next door neighbors GEC, if I wanted to? 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 Mark Frye Sent: Monday, April 18, 2011 2:00 PM To: 'RE-wrenches' Subject: Re: [RE-wrenches] Two Buildings, Two Services, One Roof Dana, Exactly, why not? I can't find anything in the Code that says 'Thou shalt not make a connection between the grounding system of two seperate services located on two seperate buildings." But re your example in this case the PV for both building will be located on only one of the two. Mark Frye Berkeley Solar Electric Systems 303 Redbud Way Nevada City, CA 95959 (530) 401-8024 <http://www.berkeleysolar.com/> www.berkeleysolar.com
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