good point any conduit can carry moisture, and conduits from hot to cold can hve condensation, air flow should be avoided. the duct seal is good for this darryl
--- On Wed, 8/26/09, boB Gudgel <b...@midnitesolar.com> wrote: > From: boB Gudgel <b...@midnitesolar.com> > Subject: Re: [RE-wrenches] raintite box mounting angle > To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org> > Date: Wednesday, August 26, 2009, 5:05 PM > Conrad Geyser wrote: > > > > We always fill any conduit at the point of building > penetrations for air sealing. Otherwise in winter, not only > will the conduit get house moisture condensing inside of it, > but it will act a a nice thermo siphon for pulling warm air > out of the house….. > > > > Just a note here... > > All six of the MidNite PV combiner boxes are rain "proof", > but allow moisture to escape. > > boB > > > > > > > > > > > ------------------------------------------------------------------------ > > > > *From:* re-wrenches-boun...@lists.re-wrenches.org > [mailto:re-wrenches-boun...@lists.re-wrenches.org] > *On Behalf Of *Wind-sun.com > > *Sent:* Tuesday, August 25, 2009 11:49 AM > > *To:* jry...@netscape.com; > RE-wrenches > > *Subject:* Re: [RE-wrenches] raintite box mounting > angle > > > > It is almost impossible in a normal installation to > get a totally waterproof enclosure. > > > > What you describe with the flooded box is more common > than people might think. > > > > What causes most of that is condensation. Humid air > gets sucked into the enclosure at night or whenever else it > cools off. The water then condenses inside. Next day, the > box heats up again and the air expands a bit again, but the > water has already condensed and cannot get out. > > > > That is why the weep hole as you noted is mandatory, > especially in areas with high humidity. But we have seen > this even in the desert regions of Arizona and CA, so it can > happen anyplace over long periods of time. > > > > > .................................................................................................. > > Northern Arizona Wind & Sun - Electricity >From > The Sun Since 1979 > > Solar Discussion Forum: http://www.wind-sun.com/ForumVB/ > > > .................................................................................................. > > > > ----- Original Message ----- > > > > *From:* Jeff Yago > <mailto:jry...@netscape.com> > > > > *To:* k...@vtsolar.com > <mailto:k...@vtsolar.com> > ; RE-wrenches > > <mailto:re-wrenches@lists.re-wrenches.org> > > > > *Sent:* Tuesday, August 25, > 2009 8:40 AM > > > > *Subject:* Re: [RE-wrenches] > raintite box mounting angle > > > > > > I am getting more convinced > that there is no such thing as a > > water-tight electrical > enclosure, regardless of gasket covers and > > sealed openings. We always > drill a very small "weep-hole" in the > > bottom of an enclosure. We > have found this is too small to allow > > insects to enter, but will > drain any leaks or moisture that gets > > condensed into a liquid. I was > recently called by the owner of a > > large pole mounted array (that > was installed by another firm ) > > when the system stopped > working and the originally installer was > > long gone. I absolutely swear > to you that when I pulled the covers > > off several electrical > junctions boxes, water POURED out of the > > enclosures! I am not talking > about wet, I am saying about a quart > > of water was being held inside > each enclosure by their water-proof > > gasketed covers. Needless to > say, all of the electrical terminals > > and wire connectors inside > these junction boxes were badly corroded. > > > > I know they make totally > water-proof electrical equipment for > > under-water applications, but > have found most outdoor rated > > electical enclosures will get > some water inside and that includes > > under-ground conduit. Take > some advice and regardless of mounting > > orientation, drill a small > weep-hole in the bottom if there is not > > one provided by the > manufacturer. > > > > Jeff Yago > > > > DTI Solar > > > > > ------------------------------------------------------------------------ > > > > _______________________________________________ > > List sponsored by Home Power magazine > > > > List Address: RE-wrenches@lists.re-wrenches.org > > > > Options & 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 > > > > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & 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 > > _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & 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
