To be fair, with a standard staubli mc4 inside a properly installed jbox not subject to extreme pressure/temperature conditions, the only difference between thwn and pv cable(assuming similar stranding versions) is how easily the gland grabs on the wire jacket.. in that case the USE version of the staubli has a tighter gland. Kind of a non issue if the interior conditions of the box are stable and not pushing condensation inside the connector via pressure differential....a good reason to seal the conduit if it goes into conditioned space. I tighten them until they grab and in 20 years I've never had one fail in that scenario...Just my anecdotal input..maybe ones might think that clownish. I can't make a claim to the listing requirements. Sunny Regards,
On Tue, Nov 11, 2025, 11:45 PM Jason Szumlanski via RE-wrenches < [email protected]> wrote: > Haha, that was my comment, not Glenn's. A bulkhead fitting designed for > use with THWN is a different story. I was referring to a standard MC4 > connector designed and listed for use with Type PV/USE wire only. > > > Jason Szumlanski > Principal Solar Designer | Florida Solar Design Group > NABCEP Certified Solar Professional (PVIP) > Florida State Certified Solar Contractor CVC56956 > Florida Certified Electrical Contractor EC13013208 > > On Tue, Nov 11, 2025, 9:44 PM William Miller via RE-wrenches < > [email protected]> wrote: > >> Glenn: >> >> >> >> I am one of those clowns: >> >> >> >> >> https://millersolar.com/MillerSolar/practices/PV_wiring/PV_Cable_wiring/_PV_Cable_Wiring.html >> >> >> >> William >> >> >> >> Miller Solar >> >> 17395 Oak Road, Atascadero, CA 93422 >> >> 805-438-5600 >> >> www.millersolar.com >> >> CA Lic. 773985 >> >> >> >> >> >> *From:* RE-wrenches [mailto:[email protected]] *On >> Behalf Of *Glenn via RE-wrenches >> *Sent:* Tuesday, November 11, 2025 4:11 PM >> *To:* RE-wrenches >> *Cc:* Glenn >> *Subject:* Re: [RE-wrenches] Buchanan Crimp in 1000v Applications and >> the NEC >> >> >> >> >> >> I have seen some clowns using MC4 connectors with #10 THHN wire to make >> these splices. That's obviously no bueno. Crazy stuff... >> >> >> >> >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/[email protected]/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> >> _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > >
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