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

[Ray]

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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