So like I said, although logic may dictate that it will operate at a high voltage DC level, having not been tested explicitly for that, it does not have UL listing – we will not use them on the DC side of our installations for that reason.
-Glenn From: RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> On Behalf Of Dan Fink Sent: Friday, May 07, 2021 7:01 PM To: RE-wrenches <re-wrenches@lists.re-wrenches.org> 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 <mailto:dan.f...@greendustrialtraining.com> anbo...@gmail.com <mailto:anbo...@gmail.com> 970-672-4342 On Fri, May 7, 2021 at 3:43 PM Jason Szumlanski <ja...@floridasolardesigngroup.com <mailto: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
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