I don't know if it's specced. I couldn't really find anything more than the pin diagrams on Wikipedia ( https://en.m.wikipedia.org/wiki/USB-C https://en.m.wikip

I don't know if it's specced. I couldn't really find anything more than the pin diagrams on Wikipedia ( https://en.m.wikipedia.org/wiki/USB-C https://en.m.wikipedia.org/wiki/USB-C ). Those don't mention earth ground at all. But since both Dell and Apple are doing it, I guess it's at least an optional thing they can do.