I wonder how much the gauge of the wire makes with an additional ground wire over the grounding in the power cables and equipment. Unless you are trying to protect from lightning strikes, it seems like "large enough" should be enough to handle most systems. I don't know what the criteria would be for deciding the gauge of wire would be. It seems like that would be just a guess or try it and see if it works. That may be a question for CGabriel of Shunyata. I don't have a strong understanding of grounding and my assumptions could be way off.
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