Mark, Wait a minute...I may be wrong here, as I have become the "graybeard guy who handles off-grid and weird stuff" at Positive Energy, but I think the 2008 Code allows 120% for commercial, not just residential, as long as it is fed at the bottom of the bussbar. 2011 NEC is trying to make it a bit less confusing by adding a set of alternatives. Allan at Positive E -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mark Frye
"Dwelling Unit. A single unit, providing complete and independent living facilities for one or more persons, including permanent provisions for living, sleeping, cooking, and sanitation." From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mark Frye 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. _____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of August Goers 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. From: William Miller [EMAIL PROTECTED] 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 >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
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