Brian, You mean something like this? http://www.mcmaster.com/#butt-splices/=skc88h
-N On Wed, Jun 25, 2014 at 2:38 PM, Brian Mehalic <[email protected]> wrote: > I agree, the pre insulated splices are okay for if you need an extension > in a box, that stays dry, and the wire isn't pushed up against something. > Otherwise apply separate heat shrink after the splice. Just don't forget to > slip it on the wire before splicing! > > I kind of like the idea of a properly torqued set screw splice with > insulated heatshrink. There's got to be a direct bury kit available. > > Brian > > On Jun 25, 2014, at 2:01 PM, Ray Walters <[email protected]> wrote: > > I've had butt splices fail, due to a ratchet release type crimper that > didn't pinch the wires tight enough. > I now use a good old Klein crimper that puts a big indent on one side. > The problem with this however, is that it damages the built in insulation. > My favorite butt splice is uninsulated, and then slide adhesive shrink wrap > up tubing up over the connection after. We use these on submersible pumps > that are 100 ft under water with no issues. > > R.Ray Walters > CTO, Solarray, Inc > Nabcep Certified PV Installer, > Licensed Master Electrician > Solar Design Engineer303 505-8760 > > On 6/25/2014 11:43 AM, Nathan Charles wrote: > > Hi All, > > Has anybody had success with these butt splices with the adhesive shrink > tubing? http://www.mcmaster.com/#butt-splices/=skb9qs > > Best, > > > > On Wed, Jun 25, 2014 at 1:12 PM, August Goers <[email protected]> wrote: > >> Hi All - >> >> We have been using outdoor Ideal brand wire nuts (the blue ones packed >> with waterproof gel/grease) for all of our residential DC side splices >> (typically #10 wire) for 10 years now and have never had a single problem. >> If the installers properly strip the conductors and follow the >> instructions I feel that these wire nuts make very robust connections. We >> always do a good pull test after twisting the wire nut on. I would never >> recommend standard wire nuts without the grease and have seen these fail >> numerous times during inspections of systems installed by others. >> Insulated terminal blocks also work well but don't have that nice >> waterproof grease in them to help avoid moisture issues. You can wrap them >> with a good splicing tape to help keep moisture out but the cost for these >> connections is significantly higher than wire nuts: >> >> http://solutions.3m.com/wps/portal/3M/en_US/EMDCI/Home/Products/Catalog/~? >> N=5433135&rt=c3 >> <http://solutions.3m.com/wps/portal/3M/en_US/EMDCI/Home/Products/Catalog/%7E?%0AN=5433135&rt=c3> >> >> Normally I error on the robust conservative side of the installation >> spectrum but in this case it sounds like I may not. >> >> Just my $0.02 >> >> Best, August >> >> >> -----Original Message----- >> From: RE-wrenches [mailto:[email protected]] On >> Behalf Of William Miller >> Sent: Wednesday, June 25, 2014 8:40 AM >> To: RE-wrenches >> Subject: Re: [RE-wrenches] AFCI disturbances. >> >> Richard: >> >> Possibly. I think I prefer din mount connector blocks. However, if a wire >> nut can arc internally a connector block might also. I am still wondering >> about this concept. >> >> William >> >> Miller Solar >> >> > On Jun 25, 2014, at 6:09 AM, [email protected] (Richard L >> Ratico) wrote: >> > >> > William, >> > Would UL listed crimp sleeves be an acceptable substitute where you >> > would otherwise use wirenuts? >> > >> > Dick Ratico >> > Solarwind Electric >> > >> > >> > --- You wrote: >> > Bob-O: >> > >> > >> > >> > When you say verboten, what does that mean? Not kosher? Frowned upon? >> > Disallowed by law??? >> > >> > >> > >> > I am quite curious about this subject. Here is what I have learned so >> far: >> > >> > >> > >> > This is a unique case where we are replacing 3 dead SMA U series >> > inverters with 2 US series inverters. The U series seem to all be >> > dying at about 12 to 14 years of age. We have about a dozen of these >> > to swap on our calendar and expect more. It may be that to do this >> > right requires that we pull new wire from the arrays. This makes the >> job a lot more expensive. >> > >> > >> > >> > We have never used a wire nut on a PV lead until this project. It's >> > not that we disapprove of wire nuts in general, it is because we know >> > that if we were to use them regularly we would eventually have failures >> and call backs. >> > We allow only one splice in a PV lead: between the cable provided by >> > the manufacturer of the module and a bulkhead mounted MC4 connector >> > direct to THWN in conduit >> > (http://millersolar.com/MillerSolar/practices/PV_wiring/PV_Cable_wirin >> > g/_PV_ >> > Cable_Wiring.html). >> > >> > >> > >> > We checked the manufacturer's listing and the wire nuts are rated for >> > 600 volts. We do use wire nuts on AC circuits, such as switch and >> > receptacle circuits in a power room. >> > >> > >> > >> > A tech at SMA told me that wire nuts "arc internally to the spring" >> > causing the AFCI faults. I am not aware of any process of "internal >> > arcing." To me, arcing means, as per the dictionary definition: "a >> > luminous bridge formed in a gap between two electrodes." The same >> > tech told me to solder the leads and apply shrink tubing. I don't >> > believe this is an approved method. By the way, we have spliced leads >> > on both US series inverters and only one is exhibiting AFCI >> disturbances. >> > >> > >> > >> > I do favor mounted terminal blocks, either screw or tubular type. I >> > need to check if the Amp model we stock are 600 volt rated. >> > >> > >> > >> > I was told by another representative from SMA that on a ground-mount >> > system it is legal to disable the AFCI protection. >> > >> > >> > >> > I will be troubleshooting this job tomorrow and I will let you all >> > know what I learn. >> > >> > >> > >> > William Miller >> > --- end of quote --- >> > _______________________________________________ >> > List sponsored by Redwood Alliance >> > >> > List Address: [email protected] >> > >> > Change listserver email address & settings: >> > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> > >> > List-Archive: >> > http://www.mail-archive.com/[email protected]/maillist >> > .html >> > >> > List rules & etiquette: >> > www.re-wrenches.org/etiquette.htm >> > >> > Check out or update participant bios: >> > www.members.re-wrenches.org >> > >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/[email protected]/maillist.htm >> l >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/[email protected]/maillist.html >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> >> > > > -- > Nathan Charles > Engineer > NABCEP Certified PV Installation Professional #042013-20 > Paradise Energy Solutions > (717) 283-2021 direct > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & > settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette:www.re-wrenches.org/etiquette.htm > > Check out or update participant bios:www.members.re-wrenches.org > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > > -- Nathan Charles Engineer NABCEP Certified PV Installation Professional #042013-20 Paradise Energy Solutions (717) 283-2021 direct
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