[RE-wrenches] MC4s are listed for THWN, right?

[Ray]

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.chris at gmail.com <mailto:sparadeo.chris at 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.
>
>
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