This Basic Electrical Outlet Wiring Diagram depicts a straightforward layout of all the components/parts of a standard 15A 120V Duplex Receptacle. As the name implies, a duplex receptacle has two outlets for plugging in two different plugs. Each half has its own neutral (long slot), hot (short slot), and ground hole (U-shaped). For safety, this receptacle ensures that the connection from the plug is polarized and grounded. This Basic Electrical Outlet Wiring Diagram depicts a straightforward 15A 120V outlet. Regardless of the type of outlet, they all have three basic screw terminals that must be properly wired to the respective wires.