NEC 2014 section 705.12(A)

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hhsting

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Glen bunie, md, us
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NEC 2014 section 705.12(A) says sum of the ratings of all overcurrent protection devices connected to power production sources shall not exceed rating of service.


I have 400A fused main service disconnect AC solar and 600A fused main service building disconnect. Rating of service is 600A.

Do I count 600+ 400 or just look at 400 for sum of all overcurrent devices power production source? Utility overcurrent fused disco count?
 

wwhitney

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Berkeley, CA
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Retired
I would say that for each power production source, you look at the first OCPD upstream of it, and use that rating. So if you have a single solar inverter, and the first OCPD upstream from it is 400A, then the sum is 400A. In particular, if there are no power production sources downstream of the 600A disconnect, you certainly don't count the 600A.

Cheers, Wayne
 
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