I think he's talking about plugging into a single plug and using over 15 amps. Of course each plug can handle the 9 amps but drawing over 15 amps from a single 15 amp plug is a code violation based on 210.21B2 right? Then it doesn't matter if the internals are the same as a 20 amp receptacle or not because code states that max load on a 15 amp receptacle cannot exceed 12 amps regardless of the breaker size. And, on a 20 amp receptacle its 16 amps so we can never pull 18 amps by code. I never meant to imply that a GFCI has any over current protection. This conversation has nothing to do with GFCI's actually.