This outlet is commonly used for a heavy load such as a large air conditioner. The outlet should be wired to a dedicated 20-amp/240-volt circuit breaker in the service panel using 12|2 awg cable.
With this wiring, both the black and white wires are used to carry 120 volts each and the white wire is wrapped with electrical tape to label it hot. This circuit doesn’t make use of a neutral wire and the ground wire is connected to the ground terminal on the device. The slots are configured to accept only plugs from compatible appliances.
Here the source is at the receptacle and 2-conductor cable runs from there to SW1. The hot source is spliced to a pigtail that connect to the bottom, always-hot, half on the receptacle and to the white cable wire which continues on to the bottom terminal on SW1. The black cable wire is connected to the top terminal on the split receptacle and runs to the top terminal on SW1. The circuit neutral wire is connected to one of the neutral terminals on the receptacle, it doesn’t run to the switch.
Here two 4 way and two 3 way switches are used to control lights from four different locations. The source is at SW1 and the hot wire is connected to the common terminal. Three-wire cable runs between all switches and 2-wire cable runs from the last switch to the light fixture. The light hot connects to the common terminal on SW2.
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