[RE-wrenches] Two Buildings, Two Services, One Roof

[Mark Frye]

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-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at 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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