Great discussion, all. Thank you. For 1000V (where we also tend to favor MC-style connectors), we are connecting PVWire to 1000V-rated XHHW-2 (which is not PVC), and always inside a 3R box.
Blake On Wed, Apr 28, 2021 at 9:00 AM Ray <r...@solarray.com> wrote: > I think the biggest issue with poor connections on the Polaris type blocks > is not stripping enough insulation off the wire. They need much more > stripped off than other types of connectors. With too much insulation > remaining, the screw tightens on the insulation, and the electrical > connection is just some loose copper tickling the inside of the barrel. > You wouldn't notice it at first with testing, but it would definitely start > to over heat over time. Might catch it with a FLIR though. > > What other connectors are 1000 v rated? This seems like more an issue of > having the manufacturer's retest to 1000v. I can't imagine those blocks > not being able to handle 1000v, but..... > > Ray Walters > Remote Solar > 303 505-8760 > > On 4/28/21 11:27 AM, Corey Shalanski wrote: > > Chris's reminder is a good one—the 600V rating of most insulated > "multi-tap" connectors pretty much limits their use to residential systems. > I would also keep in mind that those connectors generally have a torque > spec. I've definitely seen examples of meltdowns caused by poor > terminations - either the compression screw isn't torqued properly or the > conductor isn't fully inserted. To help eliminate the latter case, we used > to favor the Burndy models (e.g., BIT4 > <https://www.hubbell.com/burndy/en/Products/Power-Utilities/Connectors/Lugs-Terminals/Bolted/Vinyl-Insulated/BIT4/p/2021315>) > because they had a transparent case; I see that Polaris also now offers > transparent models (e.g., IT-4C > <http://www.nsiindustries.com/catalog/nsiproducts/polaris-mechanical-connectors/polaris-vision-tap/it-4c> > ). > > -- > Corey Shalanski > Jah Light Solar > Portland, Jamaica > > > On Wed, Apr 28, 2021 at 7:38 AM Chris Sparadeo <sparadeo.ch...@gmail.com > > wrote: > >> Keep in mind that Wagos, Polaris lugs, Multi-tap Burndy lugs are rated >> for 600V. I can see this being a possible use for MC4 connectors in a >> higher voltage splice scenario, because of their 1000V/1500V ratings. > > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > 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 > > There are two list archives for searching. When one doesn't work, try the > other:https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/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: RE-wrenches@lists.re-wrenches.org > > 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/re-wrenches@lists.re-wrenches.org/ > 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 > > -- Blake Gleason, PE | Employee Owner Director of Innovation and Technical Excellence O: 510-845-2997 x128 C: 510-867-5878 1035 Folger Ave. Berkeley, CA 94710 www.sunlightandpower.com License #326203 <https://bcorporation.net/> <https://www.amicussolar.com/> <https://calssa.org/>
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