Rooftop wiring [RE-wrenches]

[Bill Brooks]

Brad,

If this story is true, then we are going to have a very tough time getting
inspectors to accept the use of TC. Type TC must be supported properly, as
does any cable that is outside of conduit.

I routinely see the USE-2 cable that comes with these plug-in modules laying
on the roof in the wiring from module to module. This concerns me greatly
because their are few things more abrasive than asphalt shingle roofs. I
have not seen it laying all over the roof on the home runs, but I'm sure it
happens. I have seen flexible conduit laying all over the roof which is
equally bad and aweful looking.

Bill.


-----Original Message-----
From: Brad Bassett [mailto:bsbassett at earthlink.net]
Sent: Wednesday, April 10, 2002 9:25 PM
To: RE-wrenches at topica.com
Subject: Rooftop wiring [RE-wrenches]


In talking to a well respected solar installer the other day, I learned
that they considered it OK to run Tray Cable or USE exposed across and
on the roof of a house from the array, over the eave, and around and
under and into conduit, without any j-boxes or protection for the wire.
My question is how prevalent this practice is with solar installers
around the country. I can't imagine any inspector in Washington state
would pass such an installation, and am shocked that systems like this
apparently pass regularly in at least one area of California.

Another question I have is how often do other installers use a ground
wire to every module, or a star washer on each module and ground the
rack? What's common practice for grounding arrays?

Thanks,

Brad Bassett
Schott Applied Power
Tumwater, WA office
bsbassett at earthlink.net

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