[RE-wrenches] 120% Rule on subpanel or main

[Christopher Warfel]

What NEC code cycle are you in?  It was changed in 2008. Attached is an 
article from John Wiles in Home Power Code Corner. Chris

On 3/31/2016 1:47 PM, eric at harvesthesun.com wrote:
> Hi Wrenches,
> I know I have seen this somewhere before but can't seem to locate it 
> in the archives. Recently and AHJ rejected our plans because, although 
> we were compliant with the 120% rule applied to the busbar on the 
> existing sub which was our solar PCC, the existing breaker feeding the 
> existing sub (our PCC) exceeded the 120% as it applied to the bus in 
> the main. I was under the impression that the 120% applies to the bus 
> at the PCC and that existing equipment "downstream" or "upstream" of 
> the PCC need not be retrofitted to comply with the 120% rule 
> (conductor ampacity aside).
> Cheers,
> Eric Stikes
> Founding Director & CEO
> Good Sun Solar, A CA non-profit corp.
> www.goodsun.life
> (530)798-3738
>
>
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-- 
Christopher Warfel, President
ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
401-466-8978

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