How the requirement is interpreted will vary from one AHJ to the next. Around here, the interpretation of 2014 690.47(D) for roof mounted arrays seems to be that exception 2 allows the EGC from the array to the inverter to serve all grounding needs if it meets GEC standards. This didn't change much in 2017 NEC, again with only the EGC for fault protection required, and an auxiliary electrode (and conductor) being permitted by 690.47(b), but not required.
If the OP wants a short, fat, straight down conductor, outside the structure, it is not safe to assume the installer will put one in, especially since the home run (including the egc) is being run through the attic and the walls.
If the OP wants a short, fat, straight down conductor, outside the structure, it is not safe to assume the installer will put one in, especially since the home run (including the egc) is being run through the attic and the walls.
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