Common In Light Switch. The most common household switches are the single pole switch, the three-way switch, and the double pole switch. There is no "common" on these switches.
In electrical wiring, a light switch is a switch most commonly used to operate electric lights, permanently connected equipment, or electrical outlets. However, if the tester lights up or beeps, then the power is not off. If a light switch fails to function, it should be replaced.
The com terminal on a light switch means that it is a three way or the kind of switch used where there are two or more switches that controll the same light On the spdt switch you have three terminals, a common and two branches.
Place switch anywhere without wiring. acegoo Wireless Lights Switch Kit, No Battery No Wiring, Quick Create or Relocate On/Off Switches for Lamps Fans Appliances, Self-Powered Switch Remote Control House Lighting (Switch and Receiver).
Easy to Understand Light Switch Wiring - Fully Explained Light Switch Wiring with Diagrams and Pictures with Step-By-Step Instructions to Guide You. Three-way wall switches are most commonly used to control a light fixture from two locations, such as from both ends of a hallway or stairway. As you can see from the diagram, the white wire is used -- it completes the circuit back to the electrical It's common (in my experience with amateur wiring at least) for this step to be omitted.