Come to think of it, I've never seen a properly installed staubli mc4 connection fail that wasn't subject to extreme conditions.
On Wed, Nov 12, 2025, 6:59 AM Tyrone Houck <[email protected]> wrote: > 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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