Back at the lights the source neutral is connected to the neutral terminal on L1 and spliced with the white wire running between the fixtures. At each light it’s connected to the neutral terminal. At SW1 the red and white wires from the 3-wire cable running between switches function as the travelers with the white marked for hot using black tape or paint.
Depending on the manufacturer, the travelers may be on opposite sides of the device or the two terminals may be on the same side. In any case, the common terminal will be distinguished from the travelers in some way.
This is the oldest version of a wall receptacle that you will find. It lacks a grounding contact and the plug slots are both the same size. These devices did not make use of a ground wire and both plug slots were treated the same. The wires used with these receptacles were usually both black.
To wire this circuit, 2-conductor cable runs from the dimmer to the light. The source is at the dimmer and the hot wire is spliced to one hot wire on the device. The other wire from the dimmer is spliced to the black cable wire which runs on to the hot terminal on the light. The source neutral wire is spliced to the white cable wire which continues on to the neutral terminal on the light.
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