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

[Jerry Shafer]

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> 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> 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
>>
>>
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