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

Mark Frye Mon, 02 Feb 2015 13:07:05 -0800

I really do wonder then...

Right now, you go up to the burning house and pull the meter, bingo, noAC anywhere. So why do we need the "kill" switch next to the service (orwhere ever).... IF you drive the roof top contactor with 120vac or with24 vdc made from a power supply powered by 120vac. Either way, pull themeter, 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 thecontactor coil on the roof? So you run 120/240 vac to the box withthe "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-boun...@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 RuleQuestions

OK. So did you run a line 120V up to the box on the roof to energizethe 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
    <ma...@berkeleysolar.com <mailto:ma...@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"
        <cwar...@entech-engineering.com
        <mailto:cwar...@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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Re: [RE-wrenches] Rapid Shut Down and the 10 Second Rule Questions

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