Rooftop wiring [RE-wrenches]

[Brad Bassett]

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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