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

[Jerry Shafer]

You pull the meter you close the contact thats it so ypu dont hit the
button but same results
On Feb 2, 2015 11:06 AM, "Mark Frye" <markf at berkeleysolar.com> wrote:

>  I really do wonder then...
>
> Right now, you go up to the burning house and pull the meter, bingo, no AC
> anywhere. So why do we need the "kill" switch next to the service (or where
> ever).... IF you drive the roof top contactor with 120vac or with 24 vdc
> made from a power supply powered by 120vac. Either way, pull the meter, no
> more AC and no more power to the contactor coil on the roof, so DC limited
> to the location of the contactor.
>
> Not really sure how the requirement for the stop switch got into the Code.
>
> Mark Frye
>
> On 2/2/2015 11:11 AM, Mark Frye wrote:
>
> I see. So they have another box on the ground floor with the "kill" switch
> and that box includes a 120/240 vac to 24vdc xfrm to drive the contactor
> coil  on the roof? So you run 120/240 vac to the box with the "kill" switch?
>
> Mark Frye
> On 2/2/2015 10:52 AM, Glenn Burt wrote:
>
>  Looks like they use 24VDC for contactor activation, not 120VAC.
>
>
>
> *From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org
> <re-wrenches-bounces at lists.re-wrenches.org>] *On Behalf Of *Mark Frye
> *Sent:* Monday, February 02, 2015 1:29 PM
> *To:* RE-wrenches
> *Subject:* Re: [RE-wrenches] Rapid Shut Down and the 10 Second Rule
> Questions
>
>
>
> OK. So did you run a line 120V up to the box on the roof to energize the
> coil of the relay up there?
>
> Mark Frye
>
> On 2/2/2015 9:13 AM, Jerry Shafer wrote:
>
>  The units we have used have a large contactor inside the combiner box
> made by AMtec Solar. this was required to control the shut down includes a
> fire button done on the ground floor
>
> Jerry
>
>
>
> On Mon, Feb 2, 2015 at 5:49 AM, Mark Frye <markf at berkeleysolar.com> wrote:
>
> 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> 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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