Code Rules About Grounding
The NEC requires any unsheathed ground wire to be #6 AWG or the size of the largest conductor. It also insists that ground wire outside of conduit must be unsheathed, therefore all ground wire on the roof is #6 AWG. Many installers will continue the #6 size ground wire all the way to the inverter.
After the ground wire has effectively connected every part of a system, it makes its way to the grounding electrode conductor terminal in the inverter. Then, it goes out to a ground rod.
The color of ground wire is green.
|Ground wire from the roof, connecting to the combiner box|
on a bus bar, then continuing to the inverter
|Split Bolts and Acorn Clamps, used for grounding|