[RE-wrenches] Supply Side Tap Overcurrent Protection

[Darryl Thayer]

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 <re-wrenches at scottmccalmont.com> wrote:

> From: Scott McCalmont <re-wrenches at scottmccalmont.com>
> Subject: Re: [RE-wrenches] Supply Side Tap Overcurrent Protection
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> 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
> <bob-o at electronconnection.com>
> 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
> >
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