What about the capacitors on the dc side of the inverter? My assumption has been that this capacitance is the reason behind the 690.17(E) labeling requirement. Admittedly I don't understand the discharge capabilities of capacitors, but I've measured their voltage and watched it decay when disconnected from a power source (and heard stories about "toss the capacitive-laden ballast to the newbie ha ha...).
So the question is, say for a of a roof mounted array and a ground-level string inverter, will additional equipment (either in the inverter or external) be required to isolate the PV/dc circuit conductors from the inverter in order to meet 690.12? Brian Mehalic NABCEP Certified Solar PV Installation Professional(tm) R031508-59 IREC ISPQ Certified Affiliated Instructor/PV US-0132 PV Curriculum Developer and Instructor Solar Energy International http://www.solarenergy.org On Tue, Jan 21, 2014 at 8:45 PM, Bill Brooks <[email protected]> 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:* [email protected] [mailto: > [email protected]] *On Behalf Of *Brian Mehalic > *Sent:* Tuesday, January 21, 2014 2:36 PM > *To:* RE-wrenches > *Cc:* [email protected] > > *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 < > [email protected]> 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 > > [email protected] > > Direct: 541.261.6545 > > > > > > > > > > On Jan 21, 2014, at 1:12 PM, [email protected]: > > > > *From: *Drake <[email protected]> > > *Subject: **Re: [RE-wrenches] NEC 2014 690.12 Rapid Shutdown* > > *Date: *January 21, 2014 11:36:15 AM CST > > *To: *RE-wrenches <[email protected]> > > *Reply-To: *RE-wrenches <[email protected]> > > > > > 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 44810CO License 3773NABCEP Certified Solar PV 740-448-7328 > <740-448-7328>*http://athens-electric.com/ > > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > > > ------------------------------ > <http://www.avast.com/> > > This email is free from viruses and malware because avast! > Antivirus<http://www.avast.com/>protection is active. > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > >
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