Electric-Light
Senior Member
quote below directly from 2017 NEC 210.8(B) -
(B) Other Than Dwelling Units. All single phase receptacles rated 150 volts to ground or less, 50 amperes or less and three-phase receptacles rated 150 volts to ground or less, 100 amperes or less installed in the following locations shall have ground-fault circuit-interrupter protection for personnel.
208Y/120 five pronger is covered. what about 240/120 high leg system because one leg is above 150?