Rooftop wiring [RE-wrenches]

jay peltz jay at asis.com
Sun Apr 14 17:32:17 PDT 2002


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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