Jerry,
As pointed out below, this is a load-side bus connection. It would follow the 120% rule if using the 2008 NEC. Since the guy is buddies with the inspector that should be no problem. However, you must follow the 2008 NEC if you want to apply it (tap must be at the opposite end of the bus from the utility feed and there must be a sign to not move the tap location. Now onto the NEC 240.21(B)5 issue-there is no way you can apply that rule and run inside a building at all. I think it is a ridiculous exception anyway given the cost of copper and potential damage that an unfused conductor could see. Just suck it up and put the 200-amp fused disconnect at the 1200 amp gear, and put an unfused 200-amp disconnect at the inverter-end of story. Bill. From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of August Goers Sent: Friday, December 05, 2008 8:01 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 > >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
_______________________________________________ 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
