[RE-wrenches] 120% rule for hybrid inverters

[Mac Lewis]

Hi Mark,

Thanks for that.  It makes sense.  My preference would be language that
said "utility-interactive current" instead of "AC output current".  For a
bi-directional inverter, I can see how an inspector would assume that the
AC output current would be the current supplying the critical load panel
and cause confusion.



On Fri, Aug 12, 2016 at 7:39 AM, Mark Westbrock <
westbrock at positiveenergysolar.com> wrote:

> 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
>
> ----
> Mark Westbrock|  VP, Branch Manager |  Employee Owner
> NABCEP™ Certified PV Installation Professional
> NABCEP™ Certified
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>
> <http://www.positiveenergysolar.com>
>
>
> 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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-- 



Mac Lewis

*"Yo solo sé que no sé nada." -Sócrates*
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