The traveler terminals will always be connected from switch to switch. Travelers never connect to a device load or to a source wire. It doesn’t matter which traveler terminal is used for which traveler wire, reversing them should make no difference.
Here the source is in the middle of the circuit. The dimmer switch is in this box where the hot is connect to the common wire. The common on SW1 is run to the light fixture hot terminal using the white cable wire to the dimmer box where it is spliced with the black cable wire going to the light. The white wire is wrapped with black tape to mark it as hot. The traveler wires are connected in the same way as the above diagrams. The neutral runs directly from the dimmer box to the light fixture.
This is an older version of the receptacle in the first diagram. The slots are different sizes to accept polarized plugs, but it lacks a grounding slot. This device does not make use of a ground wire. There is no protection against electrocution as provide by the grounded receptacle.
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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