The top terminal is connected to the black cable wire, and the source neutral is spliced to the white wire which continues on to one of the neutral terminals on the receptacle, it doesn’t matter which, only one connection is needed with the neutral wire.
This arrangement makes it possible to power the heating elements in the appliance using the two 120 volts combined and one 120 volt wire to power timers and lights. This circuit is still used for clothes dryers but not for most new installations of kitchen ranges, for that a 50 amp circuit (pictured below) is now used.
The common terminals will always be connected to a hot wire, either from the source or on the light fixture. These connections can be reversed if it’s more convenient, as long as one of the 3 way common terminals connects to the hot source and the other one connects to the hot on the load, these circuits will work properly.
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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