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: [email protected] [mailto:[email protected]] 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
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