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I really do wonder then...<br>
<br>
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. <br>
<br>
Not really sure how the requirement for the stop switch got into the
Code.<br>
<br>
Mark Frye<br>
<br>
<div class="moz-cite-prefix">On 2/2/2015 11:11 AM, Mark Frye wrote:<br>
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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?<br>
<br>
Mark Frye<br>
<div class="moz-cite-prefix">On 2/2/2015 10:52 AM, Glenn Burt
wrote:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Looks
like they use 24VDC for contactor activation, not 120VAC.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
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1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
RE-wrenches [<a moz-do-not-send="true"
class="moz-txt-link-freetext"
href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>]
<b>On Behalf Of </b>Mark Frye<br>
<b>Sent:</b> Monday, February 02, 2015 1:29 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Rapid Shut Down and
the 10 Second Rule Questions<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">OK. So did
you run a line 120V up to the box on the roof to energize
the coil of the relay up there?<br>
<br>
Mark Frye<o:p></o:p></p>
<div>
<p class="MsoNormal">On 2/2/2015 9:13 AM, Jerry Shafer
wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal">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<o:p></o:p></p>
</div>
<p class="MsoNormal">Jerry<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">On Mon, Feb 2, 2015 at 5:49 AM,
Mark Frye <<a moz-do-not-send="true"
href="mailto:markf@berkeleysolar.com"
target="_blank">markf@berkeleysolar.com</a>>
wrote:<o:p></o:p></p>
<div>
<p class="MsoNormal">Jerry,<br>
<br>
What unit did you use?<span style="color:#888888"><br>
<br>
<span class="hoenzb">Mark Frye</span></span> <o:p></o:p></p>
<div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
<div>
<p class="MsoNormal">On 2/2/2015 7:43 AM, Jerry
Shafer wrote:<o:p></o:p></p>
</div>
<blockquote
style="margin-top:5.0pt;margin-bottom:5.0pt">
<p>Wrenches<br>
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.<br>
Jerry<o:p></o:p></p>
<div>
<p class="MsoNormal">On Feb 2, 2015 5:34 AM,
"Christopher Warfel" <<a
moz-do-not-send="true"
href="mailto:cwarfel@entech-engineering.com"
target="_blank">cwarfel@entech-engineering.com</a>>
wrote:<o:p></o:p></p>
<p class="MsoNormal"
style="margin-bottom:12.0pt">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.<br>
<br>
I have read Mr. Brook's article in Solar
Pro, but AHJs may feel differently.<br>
<br>
Would anyone care to weigh in on their
interpretation?<br>
<br>
Thank you, Chris<br>
<br>
<br>
<br>
<br>
<br>
-- <br>
Christopher Warfel, President<br>
ENTECH Engineering, Inc.<br>
PO Box 871, Block Island, RI 02807<br>
<a moz-do-not-send="true"
href="tel:401-466-8978" target="_blank">401-466-8978</a><br>
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