[RE-wrenches] Buchanan Crimp in 1000v Applications and the NEC

[Tyrone Houck]

To be fair, with a standard staubli mc4 inside a properly installed jbox
not subject to extreme pressure/temperature conditions, the only difference
between thwn and pv cable(assuming similar stranding versions) is how
easily the gland grabs on the wire jacket.. in that case the USE version of
the staubli has a tighter gland. Kind of a non issue if the interior
conditions of the box are stable and not pushing condensation inside the
connector via pressure differential....a good reason to seal the conduit if
it goes into conditioned space. I tighten them until they grab and in 20
years I've never had one fail in that scenario...Just my anecdotal
input..maybe ones might think that clownish. I can't make a claim to the
listing requirements.
Sunny Regards,



On Tue, Nov 11, 2025, 11:45 PM Jason Szumlanski via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Haha, that was my comment, not Glenn's. A bulkhead fitting designed for
> use with THWN is a different story. I was referring to a standard MC4
> connector designed and listed for use with Type PV/USE wire only.
>
>
> Jason Szumlanski
> Principal Solar Designer | Florida Solar Design Group
> NABCEP Certified Solar Professional (PVIP)
> Florida State Certified Solar Contractor CVC56956
> Florida Certified Electrical Contractor EC13013208
>
> On Tue, Nov 11, 2025, 9:44 PM William Miller via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Glenn:
>>
>>
>>
>> I am one of those clowns:
>>
>>
>>
>>
>> https://millersolar.com/MillerSolar/practices/PV_wiring/PV_Cable_wiring/_PV_Cable_Wiring.html
>>
>>
>>
>> William
>>
>>
>>
>> Miller Solar
>>
>> 17395 Oak Road, Atascadero, CA 93422
>>
>> 805-438-5600
>>
>> www.millersolar.com
>>
>> CA Lic. 773985
>>
>>
>>
>>
>>
>> *From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
>> Behalf Of *Glenn via RE-wrenches
>> *Sent:* Tuesday, November 11, 2025 4:11 PM
>> *To:* RE-wrenches
>> *Cc:* Glenn
>> *Subject:* Re: [RE-wrenches] Buchanan Crimp in 1000v Applications and
>> the NEC
>>
>>
>>
>>
>>
>> I have seen some clowns using MC4 connectors with #10 THHN wire to make
>> these splices. That's obviously no bueno. Crazy stuff...
>>
>>
>>
>>
>>
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