The 2008 NEC broaden this 120% allowance to include commercial facilities. There are some additional requirements to be aware of in order to use the 120% allowance.
On 12/5/08 7:10 PM, "Mark Frye" <[EMAIL PROTECTED]> wrote: > 120% allowance is only "..For a dwelling unit....". > > Clearly this is a load side Point of Connection. If it is a "dwelling unit"" > then the 120% allowance is applicable. If it is not a "dwelling unit", then > there is no room to connect under NEC 2008. > > Mark Frye > Berkeley Solar Electric Systems > 303 Redbud Way > Nevada City, CA 95959 > (530) 401-8024 > www.berkeleysolar.com <http://www.berkeleysolar.com/> > > > > > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of August Goers > Sent: Friday, December 05, 2008 5:01 PM > To: RE-wrenches > Subject: Re: [RE-wrenches] load side taps and NEC 240.21 > > Jerry - > > A line tap typically occurs between the utility meter and the main breaker - > not after the main breaker on the load side. It seems that you are describing > a load side tap which follows the 120% rule under 2008 NEC; I might be > misunderstanding the situation. Please clarify. There are few folks out there > who are able handle these large commercial grade interconnections and I think > it is well worth discussing. > > Good luck! -August > > > August Goers > > Luminalt Energy Corporation > 4000 Irving Street > San Francisco, CA 94122 > > > Office: 415.564.7652 > Mobile: 415.559.1525 > [EMAIL PROTECTED] > www.luminalt.com > > > > From: William Miller <[EMAIL PROTECTED]> > To: RE-wrenches <re-wrenches@lists.re-wrenches.org> > Sent: Friday, December 5, 2008 4:11:15 PM > Subject: Re: [RE-wrenches] load side taps and NEC 240.21 > > Jerry: > > At a recent John Wiles seminar, John declared that this scenario is not a > tap and is therefore not covered under the tap rule. This was news to me, > but Wiles is considered some sort of guru in compliance discussions. > > William Miller > > > At 03:43 PM 12/5/2008, you wrote: > >> >Wreches, >> > >> > >> >I have a system where we are tapping onto the bus bars of a 1200 amp panel >> >fed by a 1200 amp main breaker. The easy place to tap onto the bus bars >> >is the load side of the breaker using the existing bolts. >> > >> > >> >The inverter and utility fused disco are about 200 ft away, and the tap >> >conductors travel about15ft in EMT conduit before leaving the >> >building. After that the circuit is outdoors. NEC 240.21(B)5 allows taps >> >of unlimited length for conductors located outside of a building, except >> >at the point of load (in this case supply) termination. >> > >> > >> >Can 20ft of conductor inside the building be covered by being "at the >> >point of load termination", or do I have to comply with NEC 240.21(B)2 and >> >have an OCPD within 25'? >> > >> > >> >The construction foreman for this project is buddies with the inspector, >> >so getting a signed permit won't be a problem but I want this to be a code >> >compliant system. Can anyone lend some insight to the spirit of >> >240.21(B)2 and 5? >> > >> > >> >Sorry if this has been discussed before, but searching didn't yield any >> >results. >> > >> > >> >Best, >> > >> >Jerry Caldwell >> > >> >Recurrent Energy >> > >> >_______________________________________________ >> >List sponsored by Home Power magazine >> > >> >List Address: RE-wrenches@lists.re-wrenches.org >> > >> >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 <http://www.re-wrenches.org/etiquette.htm> >> > >> >Check out participant bios: >> >www.members.re-wrenches.org <http://www.members.re-wrenches.org> > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > 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: RE-wrenches@lists.re-wrenches.org > > 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 > > > David Brearley, Technical Editor > SolarPro magazine > NABCEP Certified PV Installer > [EMAIL PROTECTED] > Direct: 541.261.6545 > Fax: 541.512.0343 > > Visit our Web site at solarprofessional.com
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