[RE-wrenches] Rapid Shut Down and the 10 Second Rule Questions
Mark Frye
markf at berkeleysolar.com
Mon Feb 2 13:11:48 PST 2015
Right, so the the "kill" switch is not really needed, but yet it is
required....! ?
On 2/2/2015 1:09 PM, Jerry Shafer wrote:
>
> You pull the meter you close the contact thats it so ypu dont hit the
> button but same results
>
> On Feb 2, 2015 11:06 AM, "Mark Frye" <markf at berkeleysolar.com
> <mailto:markf at berkeleysolar.com>> wrote:
>
> 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>
>>>
>>>
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>>
>>
>>
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