PV frame ground wire touching composite shingle roof?
Oh, no, another dreaded grounding discussion. I've read and read so many grounding discussions but have not seen any reference to whether PV frame GEC going directly to the ground rod from the roof should or should not touch composite shingle roofs per NEC. I've driven around town and see commercial installations where the #6 wire DOES touch shingles until it reaches the eaves where it is run through pvc until it hits the ground rod. Installations where the ground wire is not visible at all from outside the building coming from the roof area, I am assuming is run with the rest of the wiring through conduit to the building interior and possibly PV combiner and to the rod from there. My solar electrician nephew says he has worked on commercial solar installs, IKEA, and the large bare ground wire, something like a 1/0 or 2/0, was laid across the flat building roof until it hit the conduit. This is one of my last steps of the current install as I expand my existing 16 yr-old ground mount system with an additional 3.6 kw roof-mounted panels.