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

[Jason Szumlanski]

Some junction boxes have specific instructions for weep holes. For scepter
PVC junction boxes you can drill a 3/16 inch hole in the bottom to make a
nema 4 enclosure nema 3R.  The instructions are etched into the bottom of
the box.

Jason

On Thu, Apr 29, 2021, 11:46 AM Ray <ray at solarray.com> wrote:

> Hi Glenn;
>
> Ahh that's new from NEC 2014.  Thanks for pointing that out, and scratch
> my previous comment based on experiences in 2008.
>
> Ray Walters
> Remote Solar
> 303 505-8760
>
> On 4/29/21 11:41 AM, Glenn Burt wrote:
> > NEC 314.15 discusses drainage openings that can be made in enclosures.
> >
> > -----Original Message-----
> > From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> On Behalf
> Of frenergy
> > Sent: Thursday, April 29, 2021 9:43 AM
> > To: re-wrenches at lists.re-wrenches.org
> > Subject: Re: [RE-wrenches] MC4s are listed for THWN, right?
> >
> > Eric,
> >
> >               I like your idea of drilling the weepage holes as long as
> they are not big enough to allow critters like wasps to make a home inside
> the J-box.  We will use aluminum tape on unused mounting holes in the back
> of the box for the same reason. Lurkers welcome.
> >
> > Bill
> >
> > Feather River Solar Electric
> > Bill Battagin, Owner
> > 4291 Nelson St.
> > Taylorsville, CA 95983
> > 530.284.7849
> > CA Lic 874049
> > www.frenergy.net
> >
> > On 4/28/2021 6:19 PM, ericstev at vermontel.net wrote:
> >> Wrenches,
> >>
> >> I am normally a lurker on the List, but I would like to add a fact
> >> observation and a personal preference to the topics raised by this
> >> discussion.
> >>
> >> First, THWN does have PVC as its primary insulation, but it is
> >> sheathed in Nylon which is a polyamide plastic.  Therefore the
> >> compatibility with MC4 connectors should be polyamide being squeezed
> >> by the restraining bushing in the MC4, not PVC.
> >>
> >> I prefer Buchanan copper crimp connectors when splicing PV wire to
> >> THWN-2 in a roof junction box.  The bared wires should be lightly
> >> doped with NO-OX-ID A-Special grease
> >> https://www.sanchem.com/electrical-contact-lubricant.html
> >> <https://www.sanchem.com/electrical-contact-lubricant.html> before
> >> sleeving and crimping with the crimp sleeve to repel entry of moisture
> >> and corrosive gasses into the wire joint.  I consider the crimped
> >> joint to be superior to any screw-clamped joint that would be made in
> >> a Polaris style connector.  I also drill weepage holes in the bottom
> >> corner of the junction box to mitigate any collection of water.
> >>
> >> Eric Stevens, Vermont Made Energy
> >>
> >>
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