[RE-wrenches] PV Wiring methods

[August Goers]

Hi All –



On a related note, I’ve become good friends with some of the inspectors in
San Francisco and they called me yesterday with a question. Is it okay to
run *individual* DC conductors through EMT for wire management purposes? We
have always run paired positive and negative conductors in conduit so the
question had never occurred to me. Obviously, you have to bond both ends of
the conduit if it is over 250 v. I know that AC would have induction issues
with running individual conductors but I’m not sure with DC.



Thanks,



August





August Goers

Principal

Luminalt Energy Corporation

o: 415.641.4000

m: 415.559.1525

www.luminalt.com







*From:* re-wrenches-bounces at lists.re-wrenches.org [mailto:
re-wrenches-bounces at lists.re-wrenches.org] *On Behalf Of *William Miller
*Sent:* Monday, November 18, 2013 11:33 PM
*To:* 'RE-wrenches'
*Subject:* Re: [RE-wrenches] PV Wiring methods



Bill:



There is no need to stuff MC4 cables into standard conduit.  You can either
slot the pipe using our easy method or install bulkhead type connectors.
The connectors are readily available.  I get them from PV Cables in
Northern California..



Wire routing problems and some solutions can be found on our web-site:



http://millersolar.com/MillerSolar/practices/PV_wiring/_PV_Wiring2.html



Since the industry won’t provide wire management solutions, we are making
our own.  Questions:  Just write or call.



William Miller



*From:* re-wrenches-bounces at lists.re-wrenches.org [
mailto:re-wrenches-bounces at lists.re-wrenches.org<re-wrenches-bounces at lists.re-wrenches.org>]
*On Behalf Of *frenergy
*Sent:* Thursday, November 14, 2013 7:46 AM
*To:* RE-wrenches
*Subject:* Re: [RE-wrenches] PV Wiring methods



William, Bill....from another Bill,



        Two things:  For the rest of us (maybe it's just me?!) that's still
trying to figure out how (or why) to stuff a MC4 connector into conduit and
my hesitation in using SS wire ties for fear of the sharp edges cutting or
chaffing into cables, I'm open for advice. Any wire I use on the roof is
rated for that type of service and I have some off-grid systems that have
been in the sun for some 25 years where the wire still looks nearly new
even when flexing it to look for checking/cracks.  It seems
the wire/insulation can take it, thus it seems like the key to "wire
management is to keep the wire from moving and off the roof, secured to the
racking, thus not compromising the insulation.
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