If you have attic access between the two roofs or separated arrays then install a Soladeck at each array and run the interconnecting wires thru the attic. If it is a DC circuit then Teck cable, or AC90 would be my choice of (armoured) cable for running through the attic.
Benn Kilburn SkyFire Energy Inc. 780-906-7807 > On Aug 11, 2015, at 3:19 PM, August Goers <aug...@luminalt.com> wrote: > > Hi Wrenches, > > I have another best practices questions: what are you doing to run your PV > wire between arrays on a rooftops? This question has come up on this list in > the past but I’m still on the hunt for a robust and faster lower cost method. > We mostly install outdoor boxes on each sub array and then run EMT between > these boxes. We use strain reliefs to enter the boxes and then either keep PV > wire or transition to THWN-2 in the EMT depending on the layout. This method > takes time and the outdoor boxes aren’t cheap. Alternatively, we can run > open-ended EMT with ground bushings on the ends to bond the conduit. Since > ground bushings are designed to be used in boxes we switch out the aluminum > lug with a tin-coated outdoor rated lug and stainless hardware. This > technically violates the listing but at least the materials hold up. The EMT > needs to be carefully bent down at the ends so rain doesn’t enter. Lastly, we > sometimes run our PV wires along strut or angle aluminum (this is the fastest > method) which also needs to be bonded with a lay-in lug. > > Does anyone have other methods? > > Best, > > August > Luminalt > _______________________________________________ > 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 >
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