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Tutorial: How 3-way and 4-way switch circuits work
The traveler wires are spliced at the fixture box to run between the traveler terminals on the switches, they are not connected to the light. The traveler terminals will always be connected from switch to switch. You've gained the skills to tackle that as well. Then a 4-wire cable going between the two 3-way switches and then a 3-wire cable going from the switches to the load. Again, the white wire is marked with black on the ends to identify it as hot. It doesn't matter which traveler terminal is used for which traveler wire, reversing them should make no difference. For instance, there may not be any white wires.REGISTER TO VIEW
Not all three-way switches have these terminals placed in the same configuration, so you have to pay attention to their colors when wiring them. In the 1st diagram below, a 2- wire NM cable supplies power from the panel to the first switch box. You can add new faceplates that you prefer now as well. This arrangement allows for lowering the lights in a 3 way circuit. It's the simple three-way circuit I anticipated and encountered in my home.REGISTER TO VIEW
With this arrangement, the switches control power to the ceiling box and a pull chain is used to control fan speed. The upper left screw gets the red wire from the left box 4-cond. Multiple Switch Wiring 3- way and Single Pole. Connect the hot wire from the source to the common terminal on one 3-way, and the hot wire from the lights to the common on the other 3-way. Push the new, wired switch back into the electrical box and screw it in place. Also, rather than having two terminal screws like a conventional single-pole light switch, a three-way switch has three.REGISTER TO VIEW
How to replace your old, outdated 3-way light switches
Screw the switches into place and return their faceplates. To access the wiring, gently pull the switches out of the electrical boxes. This device can be used in place of any of the 3 way switches in these circuits, as well as to dim the lights in a 4 way switch circuit as illustrated at this link.REGISTER TO VIEW REGISTER TO VIEW