GFP on SDHW pv pump? [RE-wrenches]

[John Raynes]

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In a recent PV/NEC seminar I attended, John Wiles emphasized that the 
intent of DC GFP is fire protection, not shock hazard.  I don't know if 
that is written into any of the official NEC handbook discussions 
though.  If it is, I would try to get the inspector to justify where and 
how the potential fire hazard exists with a 10 watt module.

John Raynes
RE Solar
Torrey, UT


At 05:41 PM 11/16/2007 +0000, you wrote:

>I have a customer installing SDHW systems with PV powered pumps and the
>inspector is now saying they have to use a GFP on this 10w module when
>installed on a dwelling! If this continues and they adopt the 2008 code
>it would have to be done for all installations. I can't find any
>exceptions in the code to fight this (one would think common sense would
>work). As I see it one of the breaker based GFP's is about the only
>choice and at 0.5A trip point a dead short in a 10W module would only
>occasionally even trip it. Any ideas?
>
>Brad Bassett
>AEE Solar
>
>
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