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

Jerry Shafer jerrysgarage01 at gmail.com
Mon Feb 2 11:41:08 PST 2015


As i recall it was 24 volt
On Feb 2, 2015 8:28 AM, "Mark Frye" <markf at berkeleysolar.com> wrote:

>  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> 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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