[RE-wrenches] load side taps and NEC 240.21

[David Brearley]

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" <markf at berkeleysolar.com> 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: 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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> 
> David Brearley, Technical Editor
> SolarPro magazine
> NABCEP Certified PV Installer 
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