Hi I am running an wall unit ac that is 115v 12 amps on a 20 amp breaker with 12/2 wire. Why is the outlet that has the AC pluggled into it melting? All other outlets on the circuit appear to be fine. There are 9 recepticles that are rated 15 amp on the circuit. We have a flat screen tv, cable box, xbox, phone, desktop computer and wall unit AC all running off this 20 amp breaker. The AC unit is on the last recepticle on the circuit. Does the AC need to be on its own circuit or should we change the recepticle to a GFI? Any suggestions welcomed.