These receptacles are usually found in kitchen wall outlets where two branch circuits are needed to serve small appliances and a refrigerator separately. Wiring diagram for a 20 amp 120 volt duplex receptacle a 20 amp 120v duplex receptacle outlet like this should be installed in a circuit using 12 awg cable and a 20 amp circuit breaker.

Wiring Diagrams For Electrical Receptacle Outlets Do It
Duplex outlet wiring diagram. The diagram below will show how a standard switched duplex receptacle is wired. If you want to keep the wiring job as simple as possible purchase a quadplex outlet which consists of four outlets in a single casing and fits into a conventional quad box. Wiring two outlets in one box. With each outlet connected by its own pigtail wire if one fails because of physical damage the other wont be affected and should still work. In this diagram both top and bottom receptacles are switched off on. Switched split outlet wiring diagram for controlling the half of two duplex electrical receptacles by a wall switch without a neutral conductor.
In this diagram two duplex receptacle outlets are installed in the same box and wired separately to the source using pigtails spliced to connect the terminals of each one. Take notice that only a 3 wire cable is needed to perform this circuit. Also shown is the half of the receptacle that is live at all times and the tab that must be cut in order to split the receptacles. Or if the top and bottom outlets of a duplex receptacle are powered by two different circuits the hot tab and possibly the neutral tab will be removed. If one half of a duplex outlet is controlled by a wall switch then the hot tab and possibly the neutral tab will be broken off. The outlets are already wired together and it has the same pairs of brass and chrome terminals as a conventional duplex receptacle.