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

[Mark Frye]

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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