What Is A 3 Way Switch Control. In a hallway or large room, for example, installing three-way switches at both ends lets you turn the light fixture on or off from both. One is for ground, one is our common terminal and the other two our the traveler terminals.
Three-way switches often control one light fixture at both ends of a hallway. This layout lets you control a light fixture from three locations. Understanding how the circuit works The gray circle represents a light bulb controlled by the two switches.
A pair of three-wire cables enter the box of the four-way.
Three-way switches & multiple light fixtures (fixtures at beginning of run).
What is Two Way Switching ? If it wouldnt work well with a sonoff and a normal rocker switch. To the best of my knowledge, you can only have a dimmer at one end of the three way switching.