The upper left screw gets the red wire from the left box 4-cond. Go to my Switch Terminology Page where I discuss the terms used for the different types of home electrical switches. The traveler wires go from switch to switch connected to the traveler terminals, it doesn't matter which. The white neutral wires are connected together in each switch box. Dimmer Switch Wiring. The bare copper wires tie together with a wire nut. The black line wire connects to the common terminal of the first 3- way switch.
The black line wire connects to the common terminal of the first 3- way switch.
3 Way Switch Wiring Diagram
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. No longer allowed after NEC if no neutral wire in switch boxes 3- Way Switch Wiring Diagram Light Fixture Between Switches Line voltage enters the first 3- way switch outlet box, light fixture is located between switch boxes. The common terminal of the second 3- way switch connects to the light fixture s. No longer allowed after NEC if no neutral wire in switch boxes. Motion Detectors and Occupancy Sensors.