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

[William Miller]

Glenn:



So no junction boxes outdoors ever?  Seems impractical to me.



Or do you mean every splice in an outdoor j-box should be a waterproof
splice?  I don’t believe that is necessary and certainly not code-required.



On the other hand a well installed 3R box seems pretty standard and
reliable.  I don’t live in a showy climate so I can’t on those scenarios
but I have never had a weep hole clog.  The same thermal changes that suck
water in will force it back out.



BTW, I have never had a problem with transitioning from PV cable to THWN
using an MC bulkhead fitting.  This is what they are designed for.  I have
taken them apart decades later and they are all good.



William



Miller Solar

17395 Oak Road, Atascadero, CA 93422

805-438-5600

www.millersolar.com

CA Lic. 773985





*From:* Glenn [mailto:glenn.burt at glbcc.com]
*Sent:* Tuesday, November 11, 2025 8:42 PM
*To:* william at millersolar.com; RE-wrenches
*Subject:* Re: [RE-wrenches] Buchanan Crimp in 1000v Applications and the
NEC



Are often plugged with debris, algae, even if made, and most 3R enclosures
are already provided with weep openings.



As an industry, installing to meet minimum requirements should never be a
platform we stand on. Experience, education and shared knowledge allow us
to do better.



-Glenn



On Nov 11, 2025 22:28, William Miller via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

Weep holes. It’s allowed.


William Miller
Miller Solar.com
805-438-5600
www.millersolar.com





On Tue, Nov 11, 2025 at 7:06 PM Glenn via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

Having opened and inspected dozens of rooftop installations, I can firmly
say that anything inside a box of any kind on a rooftop will absolutely be
exposed to moisture and often water. Whether it is humidity sucked in from
thermal cycling, or gasket failure through UV degradation, or here in the
north, snow and ice damage, it will happen.



You will never convince me that it is acceptable to use any device there
that does not have a published, traceable listing for outdoor use in that
environment.



-Glenn
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