Instead of terminals, a 3 way dimmer has 4 wires coming out of the casing: one common, two travelers and one ground wire. The common wire is usually black and the travelers red. In any case, the traveler wires will usually be the same color to distinguish them from the common wire.
A 20 amp, 120v duplex receptacle like this should be installed in a circuit using 12 awg or larger cable and a 20 amp circuit breaker. These receptacles are usually found in kitchen wall outlets where two branch circuits are needed to serve small appliances and a refrigerator.
Two-wire cable runs from the switch output to the hot on the light fixture. The source neutral wire is spliced to the neutral on the receptacle half of the combo device and to the white cable wire. At the light it connects to the neutral terminal.
This diagram illustrates another multiple light circuit controlled by 3 way switches. Here the source and the fixtures come before the switches. As with the other diagrams on this page, more lights can be added by duplicating the arrangement between the fixtures.
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