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

Mark Frye Mon, 02 Feb 2015 13:12:45 -0800

Right, so the the "kill" switch is not really needed, but yet it isrequired....! ?


On 2/2/2015 1:09 PM, Jerry Shafer wrote:

You pull the meter you close the contact thats it so ypu dont hit thebutton but same results

On Feb 2, 2015 11:06 AM, "Mark Frye" <ma...@berkeleysolar.com<mailto:ma...@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-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
    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
        <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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