In this circuit the source hot is at the common on the 3 way switch and 3-wire cable runs from there to the dimmer. The traveler wires run between the 2 switches and 2-wire cable runs from the dimmer to the light. The neutral from the source is spliced at each box to run through to the neutral terminal on the light fixture. The common on the dimmer is connected to the hot terminal on the light fixture.
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.
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.
Three-way switches allow for controlling a light fixture from two separate locations, these are usually used at the top and bottom of a flight of stairs or at two different entrances to a room. On this page are several wiring diagrams that can be used to map 3 way lighting circuits depending on the location of the source with relation to the lights.
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