Hi I also just think "service entrance equupment shall be rated for the purpose" 230.66 I know my inspectors would not accept a xantrex box as service entrance equipment unless it was marked "Suitable for service entrance" The service entrance equipment is from service to Overcurrent protection. Darryl
--- On Sun, 3/28/10, Scott McCalmont <[email protected]> wrote: > From: Scott McCalmont <[email protected]> > Subject: Re: [RE-wrenches] Supply Side Tap Overcurrent Protection > To: "RE-wrenches" <[email protected]> > Date: Sunday, March 28, 2010, 9:22 PM > I would add the following NEC article > relevant to services: > > 230.91 Location. The service overcurrent device shall be an > integral > part of the service disconnecting means or shall be > located > immediately adjacent thereto. > > Fifteen feet isn't "immediately adjacent." > > Regards, > Scott > > Scott McCalmont, P.E. > McCalmont Engineering > San Jose, CA > (408) 204-0318 > > On Sun, Mar 28, 2010 at 12:08 PM, Bob-O Schultze > <[email protected]> > wrote: > > > > Dave, > > OK, here's my shot at this. Your mileage may vary. I > think 240.86(A) applies here. Unless the CB in the Xantrex > XW has a higher interrupt ratting (AIC) than the available > fault current from that supply side tap and the CB is so > marked (240.83(C), a disconnect using appropriate current > limiting OCD devices is required. I've never done a supply > side tap without the disco being fused with current limiting > fuses, nor have I ever heard of one that wasn't current > limit protected being approved. > > Good Luck, Bob-O > > ps you travel without your Code book? :) > > > > On Mar 28, 2010, at 10:52 AM, Dave Palumbo wrote: > > Wrenches, > > > > I am tasked with reviewing an installation by a > licensed electrician in Vermont and would like help with the > following: > > > > Grid-tied PV system with battery back-up. AC point of > connection is a supply side tap (done on customer side of > utility meter ) then traveling 5 feet of #2 THHWN in 1” > EMT to the 60 Amp 240vac Lockable Utility Disconnect > (unfused) and continuing 15 feet #2 THHWN 1” EMT to > Xantrex XW 60 Amp breaker. > > > > I had said that the 60amp 240vac lockable disconnect > needed to be fused, and received the following reply from > the installing electrician. > > > > << “The Xantrex XW Power Distribution Panel > contains the required over current protection (60 amp > > double pole circuit breaker) negating the need for a > redundant fuse at the Utility Disconnect switch.” > >> > > > > I am on a short trip in Florida and away from my code > books. Can someone provide guidance and code reference > please? I am concerned about the 20 foot distance of the > un-protected circuit from the supply side tap and also the > interrupt rating of the 60 Amp breaker in the Xantrex > distribution panel. > > > > David Palumbo > > Independent Power LLC > > Offices in Lamoille and the Champlain Valley > > 802.888.7194 > > www.independentpowerllc.com > > > > _______________________________________________ > > List sponsored by Home Power magazine > > > > List Address: [email protected] > > > > Options & settings: > > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > > > List-Archive: > > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > > > List rules & etiquette: > > www.re-wrenches.org/etiquette.htm > > > > Check out participant bios: > > www.members.re-wrenches.org > > > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
