What Is a 20-Amp Outlet? A 20-amp outlet is only compatible with a 20-amp circuit.The circuit's ampere rating can be found by checking the breaker box.A 20-amp outlet is identifiable by horizontal slots that cross the more typical vertical slots of a normal outlet.This kind of outlet is served by either 12-gauge or 10-gauge wiring. Sector regulations stipulate that a 20 amp outlet is set up on an individual branch 20 amp circuit,which means there is only one recipient at the end of that connection.This type of grid is issued with circuit interrupters (GFCI) meant to protect the system by shutting it down in case of overload. It is easy to identify an outlet if it's 15 or 20 amps.Although both look nearly the same,the 20 amp outlet is distinctive because one side has a T-shaped hole made for 20-amp plugs.On the other hand,15-amps have two standard plug holes as usual. In most residential areas,you can find a 15-amp and a 20-amp receptacle.