I don't understand the reference to Arc-Flash. Arc-flash ratings are dependent on high current potential, typically above 700 amp short circuit current. I don't think you can get an arc flash from a solar system as solar is inherently current limited.
On Mon, Oct 6, 2014 at 2:40 PM, William Miller <will...@millersolar.com> wrote: > Wrenches: > > > > We are getting up to speed on using transformer-less inverters. I have > advocated long for the additional safety offered by these inverters but I > am realizing the trade-offs with the new technology: The implementation > gets more complicated with the requirement for PV wire, OCPD and > disconnecting means for plus and minus and plus providing Arc Flash rated > equipment. > > > > I am currently designing a system that will locate the PV about 400 feet > from the residence. The system will utilize 2 Solectria 5200 watt > inverters at the residence. I would like to provide disconnecting means > for the 4 strings at the array, in case of any needed service or > excavating. Preferably I’d like the disconnecting means to be deployable > by a lay person (i.e. the gardener). > > > > Finding an 8 pole, arc flash, 600 VDC rated disconnect is not easy. I > could install an Outback 8 circuit combiner with 8 touch-safe fuse > holders. The new combiners have had dead-fronts for a while now. The > gardener needs only to have a Philips screw driver to open this cover. Any > better ideas out there? > > > > Thanks, > > > > William > > > > > > [image: Gradient Cap_mini] > Lic 773985 > millersolar.com <http://www.millersolar.com/> > 805-438-5600 > > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > > -- Chris Mason NABCEP Certified Solar PV Installer™ Solar Design Engineer Generac Generators Industrial technician www.cometsolar.com <http://www.cometenergysystems.com> 264.235.5670 869.662.5670 Skype: netconcepts
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