Wrenches, William Agree the push in connectors leave alot to be desired, however l have had no issue testing voltage at the connector in SMA. The industry is making installation of solar and for that matter most construction to easy and screw in lugs require more time and skill. Jerry NABCEP PV inspector
On Fri, May 7, 2021, 6:25 PM William Miller <will...@millersolar.com> wrote: > Friends: > > > > Call me old fashioned, but I cannot get any confidence on the Wago > connector. It seems somewhat akin to the back-wire mechanism on a 15A > receptacle. This connection relies on a spring that is subject to > reduction in force when it gets hot. We have seen many of the back-wire > receptacles heat up and get more resistive as heat increases, creating more > heat, etc. > > > > We have learned when connecting battery cables to inverters or batteries > that the best connection does not have any washer or any intermediate > object between one conductor and the other. > > > > I know wire nuts are not ideal (pun intended) but I like my conductors to > be in direct contact, or under a screw terminal where I can determine and > reconfirm the pressure placed on the conductor. It is also necessary to > have control over the pressure applied to the connection, which is why > there are listed torque specs. > > > > Yesterday I was measuring the line voltage on an SB Series 22 inverter. > This unit uses the Wago terminal. There was no way I could get a meter > probe into the Wago to measure line voltage. I had to take the cover off > the electronics sections and measure voltage at the circuit board. I much > prefer a screw terminal I can adjust the torque and get a meter probe onto > it. > > > > William Miller > > > > Miller Solar > > 17395 Oak Road, Atascadero, CA 93422 > > 805-438-5600 > > www.millersolar.com > > CA Lic. 773985 > > > > > > *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On > Behalf Of *Dan Fink > *Sent:* Friday, May 7, 2021 4:01 PM > *To:* RE-wrenches > *Subject:* Re: [RE-wrenches] Wago Connectors (221 series) > > > > Jason; From the Wago 221 data sheet, it's listed to UL 486C, 600V, 30A, > Use Group C (industrial) . I have a copy of UL486C, and voltage is just > specified for dielectric testing. That standard specifies tests with AC, > because it is easier (and cheaper) to generate and ramp up compared to DC, > and DC test platforms are relatively rare. > > > > So my interpretation of UL486C is that because of AC voltage peaks > compared to RMS (Vpeak = Vrms x 1,414), a 1000VAC rated connector under > UL486C would need to be tested to 1414VDC. Working that math backwards, a > 600VAC rating would mean the DC dielectric rating would be equivalent to > 424.33 VDC. > > > > How that would apply to AHJs asking you questions, I do not know! > > > > Dan Fink > > Owner, Buckville Energy Consulting LLC > > IREC Certified Instructor for PV and Small Wind Installation > > NABCEP Certified PV System Inspector > > d <dan.f...@greendustrialtraining.com>anbo...@gmail.com > > 970-672-4342 > > > > > > > > > On Fri, May 7, 2021 at 3:43 PM Jason Szumlanski < > ja...@floridasolardesigngroup.com> wrote: > > In another thread these connectors were discussed recently. There was a > question regarding the suitability for DC circuits. I don't think we came > up with any answers or consensus on that. I see the connectors are UL > listed to the 486C standard. I can't determine whether that is applicable > to AC and DC circuits. Does anyone know? > > > > I have only used these on AC circuits and they have been very effective. > Now I'm curious whether they can be used on DC circuits up to 600 volts. > > > > While on the subject, I noticed they are UL 467 listed for grounding and > bonding. That's helpful where you have EGC splices for conductors up to #10 > AWG inside junction boxes. > > > > Jason Szumlanski > > Florida Solar Design Group > > > > _______________________________________________ > 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 > >
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