[RE-wrenches] Rapid Shut Down and the 10 Second Rule Questions
Mark Frye
markf at berkeleysolar.com
Mon Feb 2 11:11:22 PST 2015
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>
>
>
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