rooftop wiring [RE-wrenches]

[carl reuter]

Jay: I have seen the same thing with THHN though I would never
advocate using it bare like that, the point is  that its hard stuff
to kill. On the other hand, I occasionally service Solahart DHW
systems that have a backup heating element in them that is usually
fed by a run of EMT conduit and the EMT is looking horrible on some 8
year old systems. This is a few miles from the coast and the salt is 
speeding up the deteriation. 
I was suprised to hear William Miller say: 
<when using non-metal flex, but I've never seen the flex fail or 
degrade.>  
I cant say I've seen it fail but I've seen my share of it  looking
like it spent time on the barbeque, completly browned and blistered
on the south facing side. Even Schedule 80 PVC starts looking that
way after 5 years around here (Santa Cruz,Ca).I like the idea of some
sort of flexible plastic shell over top of TC cable that could act as
as a UV barrier and blend into the roof visually, yet I dont know if
such a product exists. Carl Reuter 

> Date: Sun, 14 Apr 2002 17:32:17 -0700
> From: jay peltz <jay at asis.com>
> Subject: Re: Rooftop wiring [RE-wrenches]
> 
> 
> Hi all,
> 
> I have seen many systems ( mostly off grid ) that have been in for
> 15-20
> yrs.  I have seen many of them with standard THHN , in outdoor
> applications and the wire is fine.  A bit faded, and the clear
> plastic
> covering is looking really bad, but the insulation is in fine
> shape.
> 
> Now before anybody jumps on this I am NOT saying to do this.  But
> using it
> as an example that shows how long things can really work in the
> field, in
> my area at least.
> 
> Personally I use either TC or USE-2 for module interconnects. 
> Often this
> also goes to the combiner which on roofs I like to install on the
> module
> mounting ( I rarely install flush systems) and is then changed to
> flex or
> ridged plastic to the power room.
> 
> As the the idea of conduit on modules, I have seen as many or more
> problems with junction box stress cracks, or the O-ring cracking or
> compressed on one side leaving a gap that I still use and lean
> towards no
> conduit on interconnects.
> 
> Heres a question the intertie group::
> 
> on the new modules that have Multi-contact cords already attached. 
> The
> lengths are never right, so what do you do?
> 
> Thanks everyone,
> 
> jay
> 
> peltz power
> 
> 
> 
> 
> 


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