[RE-wrenches] 120% rule for hybrid inverters

[Mark Westbrock]

Hi Mac,

The wording changed because in the 2011 NEC 705.12(D) you had to use the
size of your backfeed breaker in calculating the busbar loading, but in
2014, 705.12(D)(2)(3)(b) now says "125 percent of the inverter output
circuit current and the rating of the OCPD protecting the busbar shall not
exceed 120%".

So, the 2014 wording basically allows all inverters to follow the exception
that used to be there for hybrid inverters.  I hope that helps.

Cheers,

Mark

----
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On Fri, Aug 12, 2016 at 7:26 AM, Mac Lewis <maclewis1 at gmail.com> wrote:

> Hello wrenches,
>
> I am looking for the exception to the 120% rule in the 2014 code that
> allowed for compliance to the 120% rule to be based on the
> utility-interactive current as opposed to the backfeed breaker size for
> hybrid inverter.  I hope this still exists, but I'm having a hard time
> finding it in the 2014 code.  In 2011 it was 705.12(D)2 Exception.  That
> was nice clear language that all inspectors accepted, I'm hoping the same
> exists for the 2014 code.
>
> Thanks in advance code experts
>
>
>
> --
>
>
>
> Mac Lewis
>
> *"Yo solo sé que no sé nada." -Sócrates*
>
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