I want to purchase wire for my induction cooktop which requires a dedicated 50 amps. The infor in the manual says "240/208V AC, 60 Hz, 3-wire, single-phase power supply." I know I need 6 gauge wire but would this be 6-2 (white,black and ground) or 6-3 (black,red,white and ground)? I don't have the cooktop yet to check if it has common/neutral (white) or not. My gut tells me it is just 2 hot leads and ground?? Thoughts?