Wall switches are used to control lighting, equipment, and other things around the house. They either turn things off and on or are used for a disconnecting means, like in the case of a furnace. Switches come in a variety of styles including rotary switches, push-button switches, toggle switches, mercury switches, electronic-sensor switches, single-pole switches, three-way switches, four-way switches, and many more.
Typically, a wall switch has a movable arm located between two contact points that is moved via the toggle arm. It opens and closes the circuit. When the arm makes contact with the two contacts in the ON position and power flows through the switch from terminal to terminal. When the arm is OFF position, the arm only makes contact with one side of the contact. This disconnects power through the switch and no power flows through the switch between the terminals.
On average, a wall switch is turned on and off around 1,000 times a year! because of excessive wear, it is a good idea to check the wiring connections on the terminal screws for tightness. Loose connections cause problems and are a fire hazard!
Warning signs of defective switches are cracks, buzzing or crackling sounds, and flicking lights. Warning! Be sure to turn off the power to the circuit that you are working on before you begin. Turn off the circuit breaker or unscrew the fuse supplying power to it. Remember, electrical safety is a must! I hope this little tidbit helps and lights up your day! Tomorrow we'll be switching gears and discussing more of your favorite electrical tips. Now you know a little more about switches.
