I don't have my code book with me. I would like to install 60 amp, 240 volt circ. I plan on pulling 2 #6 THHN cu conductors, 1 #8 for the neutral, and not sure if a #10 for egc is ok or do I need to size it with the neutral. I thought the egc is permitted to be 2 gauges smaller than the hot conductors and the neutral one gauge smaller. Can anyone provide code reference on this? thanks.