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

[Christopher Warfel]

I thought it was dc only also, but PV System Conductors is not defined 
as dc, so it could be interpreted as ac and dc.

Chris
On 2/2/2015 11:14 AM, Glenn Burt wrote:
> Chris,
> I am not seeing any code reference to AC being affected by 690.12. in fact
> it seems to specifically address only DC circuits.
> In Mike Holt's new PV and the NEC book, his note recommends that the rapid
> shutdown initiator be located near the service equipment, however this is
> not addressed by the code.
>
> -Glenn Burt
>
> -----Original Message-----
> From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On
> Behalf Of Christopher Warfel
> Sent: Monday, February 02, 2015 10:34 AM
> To: RE-wrenches
> Subject: [RE-wrenches] Rapid Shut Down and the 10 Second Rule Questions
>
> 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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-- 
Christopher Warfel, President
ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
401-466-8978

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