[RE-wrenches] NEC 2014 690.12 Rapid Shutdown

Tue Jan 21 18:03:02 PST 2014

OK. So I will have a high rate of acceptance if it buy an Tyco vacuum 
relay, and mount it in a Hoffman enclosure, and then put it on my roof?

On 1/21/2014 5:45 PM, Bill Brooks wrote:
>
> Brian,
>
> The requirement is generic. A listed contactor can meet the 
> requirement. A standard is only necessary for products that want to be 
> innovative in meeting the 30V, 240VA. Killing all power is an option 
> with existing listed equipment. NEC 90.4 does not apply.
>
> Bill.
>
> *From:*re-wrenches-bounces at lists.re-wrenches.org 
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On Behalf Of 
> *Brian Mehalic
> *Sent:* Tuesday, January 21, 2014 2:36 PM
> *To:* RE-wrenches
> *Cc:* re-wrenches at lists.re-wrenches.org
> *Subject:* Re: [RE-wrenches] NEC 2014 690.12 Rapid Shutdown
>
> It was suggested to me that since 690.12(5) requires the equipment to 
> be listed and identified, and there is no standard for rapid shutdown 
> equipment to be listed to then 90.3 (.4?...oh why isn't the NEC on my 
> iPad...)says 'revert to the previous version of the NEC' and presto, 
> no need to install rapid shutdown. I don't like this but the the 
> person suggesting it certainly has an audience and this will appeal to 
> installers looking to save on cost wherever possible.
>
> Sent from my iPad
>
>
> On Jan 21, 2014, at 5:11 PM, David Brearley 
> <david.brearley at solarprofessional.com 
> <mailto:david.brearley at solarprofessional.com>> wrote:
>
>     Drake,
>
>     The language in 690.12 is the compromise solution that was reached
>     to ensure continued industry stability. The alternative to the
>     combiner-level shutdown was module-level shutdown. It took a
>     consolidated industry effort to push the module-level requirements
>     out one more Code cycle---for the exact reasons that you touch on
>     below.
>
>     Not sure if this link has been published on the Wrenches list or
>     not, but it provides some background on the topic:
>
>     http://www.youtube.com/watch?v=sUXShMZJorQ
>
>     David Brearley
>
>     Senior Technical Editor,/SolarPro/magazine
>
>     NABCEP Certified PV Installation Professional
>
>     david.brearley at solarprofessional.com
>     <mailto:david.brearley at solarprofessional.com>
>
>     Direct: 541.261.6545
>
>     On Jan 21, 2014, at 1:12 PM,
>     re-wrenches-request at lists.re-wrenches.org
>     <mailto:re-wrenches-request at lists.re-wrenches.org> wrote:
>
>
>
>         *From:*Drake <drake.chamberlin at redwoodalliance.org
>         <mailto:drake.chamberlin at redwoodalliance.org>>
>
>         *Subject:**Re: [RE-wrenches] NEC 2014 690.12 Rapid Shutdown*
>
>         *Date:*January 21, 2014 11:36:15 AM CST
>
>         *To:*RE-wrenches <re-wrenches at lists.re-wrenches.org
>         <mailto:re-wrenches at lists.re-wrenches.org>>
>
>         *Reply-To:*RE-wrenches <re-wrenches at lists.re-wrenches.org
>         <mailto:re-wrenches at lists.re-wrenches.org>>
>
>
>
>
>         Bill,
>
>         It is good to see that energized conductors are going to be
>         disconnected near the arrays. I've been an advocate of
>         disconnecting these conductors by ground fault sensing
>         equipment since ground fault detection was first implemented
>         in the code. If contactors are to be installed on roofs, it
>         likely won't be long before both ground faults and arc faults
>         are automatically cleared.
>
>         When the requirement for AC arc fault branch circuit
>         protection was first put in the NEC, it was postdated to allow
>         time for the electrical industry to adapt. This new remote
>         disconnecting requirement does not provide any lead time.
>
>         As the 2014 NEC is adopted in various jurisdictions,
>         inspectors may feel that it is necessary to disallow systems
>         without the newly required disconnect feature. This may result
>         in serious problems for solar companies and customers, as well
>         as manufacturers.
>
>         The protection of firefighters is essential. The
>         implementation of renewables is essential also. Insurance
>         claims for weather related, global warming-triggered climatic
>         disasters are rising exponentially. Extreme weather related
>         events result in major loss of life and billions of dollars in
>         property damage. Atmospheric CO2 levels continue to climb from
>         the burning of fossil fuels. This is a crisis of global
>         proportions.
>
>         My request for code writers is to please take into account the
>         effect that inserting new rules into the NEC may have on the
>         stability of renewable energy, and implement new requirements
>         in a way that will allow for a smooth interface.
>
>         Thank you,
>
>         Drake
>
>         Drake Chamberlin
>         /Athens Electric LLC//
>         OH License 44810
>         CO License 3773
>         NABCEP Certified Solar PV
>         740-448-7328
>         /http://athens-electric.com/
>
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