Most solar array string wiring is in the #10 range and NEC Table 250.122 allows a #10 to #12 bare copper ground wire connected to the back of each module grounding lug based on staying under 100 amps max. breaker rating in the combiner boxes. However, 250.120( C) states "equipment grounding conductors smaller thatn #6 shall be protected from physical damage and run in raceway......except where protected from physical damage"
For modules mounted on ground mounted racking and racking located on roofs and structures where you can access the back of the modules we had to use #6 base copper. I just commissioned a large array on multiple raised racking, but installed on a raised steel structure allowing parking under the array. Although you would need a ladder to access, this ground wiring is exposed and visible from below. The inspector has not been involved "YET" , but I want to make sure I do not allow this and the inspector later flags it. Any of you run into this before? Thanks, Jeff Yago
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