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

[Mark Frye]

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] 
>> *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 <mailto: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
>>         <mailto: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 <tel:401-466-8978>
>>
>>
>>         _______________________________________________
>>         List sponsored by Redwood Alliance
>>
>>         List Address: RE-wrenches at lists.re-wrenches.org
>>         <mailto:RE-wrenches at lists.re-wrenches.org>
>>
>>         Change listserver email address & settings:
>>         http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>
>>         List-Archive:
>>         http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>>
>>         List rules & etiquette:
>>         www.re-wrenches.org/etiquette.htm
>>         <http://www.re-wrenches.org/etiquette.htm>
>>
>>         Check out or update participant bios:
>>         www.members.re-wrenches.org <http://www.members.re-wrenches.org>
>>
>>
>>
>>         _______________________________________________
>>
>>         List sponsored by Redwood Alliance
>>
>>           
>>
>>         List Address:RE-wrenches at lists.re-wrenches.org  <mailto:RE-wrenches at lists.re-wrenches.org>
>>
>>           
>>
>>         Change listserver email address & settings:
>>
>>         http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>
>>           
>>
>>         List-Archive:http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>>
>>           
>>
>>         List rules & etiquette:
>>
>>         www.re-wrenches.org/etiquette.htm  <http://www.re-wrenches.org/etiquette.htm>
>>
>>           
>>
>>         Check out or update participant bios:
>>
>>         www.members.re-wrenches.org  <http://www.members.re-wrenches.org>
>>
>>           
>>
>>
>>     _______________________________________________
>>     List sponsored by Redwood Alliance
>>
>>     List Address: RE-wrenches at lists.re-wrenches.org
>>     <mailto:RE-wrenches at lists.re-wrenches.org>
>>
>>     Change listserver email address & settings:
>>     http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>
>>     List-Archive:
>>     http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>>
>>     List rules & etiquette:
>>     www.re-wrenches.org/etiquette.htm
>>     <http://www.re-wrenches.org/etiquette.htm>
>>
>>     Check out or update participant bios:
>>     www.members.re-wrenches.org <http://www.members.re-wrenches.org>
>>
>>
>>
>>
>>     _______________________________________________
>>
>>     List sponsored by Redwood Alliance
>>
>>       
>>
>>     List Address:RE-wrenches at lists.re-wrenches.org  <mailto:RE-wrenches at lists.re-wrenches.org>
>>
>>       
>>
>>     Change listserver email address & settings:
>>
>>     http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>
>>       
>>
>>     List-Archive:http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>>
>>       
>>
>>     List rules & etiquette:
>>
>>     www.re-wrenches.org/etiquette.htm  <http://www.re-wrenches.org/etiquette.htm>
>>
>>       
>>
>>     Check out or update participant bios:
>>
>>     www.members.re-wrenches.org  <http://www.members.re-wrenches.org>
>>
>>       
>>
>>
>>
>> _______________________________________________
>> List sponsored by Redwood Alliance
>>
>> List Address:RE-wrenches at lists.re-wrenches.org
>>
>> Change listserver email address & settings:
>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>
>> List-Archive:http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>>
>> List rules & etiquette:
>> www.re-wrenches.org/etiquette.htm
>>
>> Check out or update participant bios:
>> www.members.re-wrenches.org
>>
>
>
>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out or update participant bios:
> www.members.re-wrenches.org
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20150202/6ab7bc68/attachment-0003.html>