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

[Hans Frederickson]

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