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

[Mark Frye]

Jerry,

What unit did you use?

Mark Frye

On 2/2/2015 7:43 AM, Jerry Shafer wrote:
>
> 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 
> <mailto: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 <tel:401-466-8978>
>
>
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