[RE-wrenches] NEC 2014 690.12 Rapid Shutdown

[Bill Brooks]

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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