[RE-wrenches] load side taps and NEC 240.21

Mark Frye markf at berkeleysolar.com
Fri Dec 5 17:13:00 PST 2008


"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."
 
Mark Frye 
Berkeley Solar Electric Systems 
303 Redbud Way 
Nevada City,  CA 95959 
(530) 401-8024 
 <http://www.berkeleysolar.com/> www.berkeleysolar.com  
 

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Mark Frye
Sent: Friday, December 05, 2008 5:10 PM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] load side taps and NEC 240.21


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 
 <http://www.berkeleysolar.com/> www.berkeleysolar.com  

 

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] 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
august at luminalt.com
www.luminalt.com



  _____  

From: William Miller <wrmiller at charter.net>
To: RE-wrenches <re-wrenches at 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
>
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