[RE-wrenches] Rapid Shut Down and the 10 Second Rule Questions

[Jerry Shafer]

Wrenches
We have installed some of these rapid shut down units and they are always
located close to the array and ours kill the DC instantly as long as the
inverter was running when this accures did not test it with inverters
already off.
Jerry
On Feb 2, 2015 5:34 AM, "Christopher Warfel" <cwarfel at entech-engineering.com>
wrote:

> We have a interpretation problem among some people I work with with, and
> 690.12 Rapid Shut Down and the the 10 second time for reducing ac and dc
> conductors to 240ma, and 30V.  The word "initiation" seems to indicate that
> all affected conductors need to be at these levels within 10 seconds of
> de-energizing either the ac or dc conductors. If so, then the disconnects
> need to be co-located to meet this requirement if this interpretation is
> correct.
>
> I have read Mr. Brook's article in Solar Pro, but AHJs may feel
> differently.
>
> Would anyone care to weigh in on their interpretation?
>
> Thank you, Chris
>
>
>
>
>
> --
> Christopher Warfel, President
> ENTECH Engineering, Inc.
> PO Box 871, Block Island, RI 02807
> 401-466-8978
>
>
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