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

[Mark Frye]

Thanks Ken,
 
I still don't see any configuration of equipment that would not involve
making an electrical connection between the two grounding systems of the two
seperate dwellings
 
In order to provide the required GFP for the PV modules, it seems both
inverters would have to mounted on the shop.
 
If I put all modules, and both inverters on the shop and run a feeder (?)
from one of the inverters back to the house, could I get away with not
running a equipment ground conductor along with the inverter output circuit
conductors? If I do run an EGC then it will connect the two grounding
systems.
 
I guess 230 does allow multiple service on a single dwelling where justified
by the size of the building. Perhaps one could, by bonding the grounding
systems of house and the shop, argue that they basically constitute one
large dwelling.
 
The questions keep mounting up. 250 allows bonding the groundingstem of
multiple seperately derived systems, but could we construe a utility service
to one dwelling as a seperately derived system relative to another dwelling
with it's own service? Where can one find the definition of a "seperately
derived system" in the Code?
 
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 Kent
Osterberg
Sent: Monday, April 18, 2011 7:58 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Two Buildings, Two Services, One Roof


Mark,

NEC 230.2(A) specifically allows two services for parallel power production
sources. While a feeder from the house is technically not the same as a
service, it should be allowed provided that there is a disconnect grouped
with the main service disconnect. A discussion with the inspector ahead of
time should make this work smoothly.

Kent Osterberg
Blue Mountain Solar


Mark Frye wrote: 

Thanks Nick,
 
250 talks about two seperate buildings with one service, and 230 talks about
one building with two services.
 
I don't think this particular situation has been contempated by the Code.
 
How big a deal would it be to just bond the two ground electrode systems
together and go along my merry way?

Mark Frye 
Berkeley Solar Electric Systems 
303 Redbud Way 
Nevada City,  CA 95959 
(530) 401-8024 
 <http://www.berkeleysolar.com/> www.berkeleysolar.com  

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20110418/0e860451/attachment-0003.html>