I have a question when swapping out a NEMA 14-50 with a Wall Connector. Since the neutral is unused, I have it disconnected at both ends with a wire nut. For ground I just used the normal ground wire in the 6-3 THHN. My question is should I be using the neutral wire for ground instead of the smaller ground wire? I know in normal circumstances there is no current in the ground wire, and in the case of a short, I would expect the breaker to trip prior to that wire getting too hot, but not entirely sure what the best way to wire this up is.