Wiring Diagrams for Electrical Receptacle Outlets - Do-it Wiring a Grounded Duplex Receptacle Outlet. This is a standard 15 amp, 120 volt wall receptacle outlet wiring diagram. This is a polarized device. The long slot on the left is the neutral contact and the short slot is the hot contact. A grounded contact at the bottom, center is crescent shaped. Don't use this receptacle when no ground wire is available.There are two sets of separated terminals on a ground fault circuit This outlet is commonly used for a heavy load such as a large air conditioner. The This receptacle provides 240 volts and 30 amps service. A 3-wire cable is needed to This is a newer version of the outdated 30 amp receptacle appearing in the previous This wiring diagram is used for 50 amp appliance outlet. The receptacle should be Wiring Diagrams for Multiple Receptacle Outlets - Do-it Wiring for multiple ground fault circuit interrupters (gfci) and standard duplex receptacles are included with protected and non-protected arrangements. Wiring Multiple Outlets in a Series In this diagram wall outlets are wired in a row using the terminal screws to pass voltage from one receptacle to the next.