The common terminal is the bridge between the power supply and the load typically a light fixture. Another dead giveaway of a three way switch is the absence of on and off markings.
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3 way switch only works when one switch is on. I think you have the hot line going to one of the switch legs on switch a. The spdt toggle switch can be considered as a two way light switch as it has three terminals and works very similar to the two way light switch. Three way switch works as as one switch is in the up position. There are many ways that a three way switch can be wired but usually power or the light fixture connect to the load side of the switch and traveler wires run between traveler screws on both switches. The light only will turn on when both switches are down. The common terminal is one of three electrically active terminals on a 3 way switch not including the ground terminal that is located on the metal frame of the mounting ears.
I have two additional questions but if ive already take. Dont know if it ever work correctly or if it was originally wired wrong. Switch a works regardless of position of switch b. Switch b only works when the light was first turned on by switch a. Three way switches work by alternating the power connection between 2 legs called travelers. Both switches have to same wiring setup.
Just move in and ive got a 3 way switch in the kitchen. A three way light switch is different than a traditional single pole light switch as it contains an extra screw to connect an extra wire. Any other combination and no light. When both switches are aligned so that they both send power through the same leg the light goes on. This is known as the common screw and its usually black instead of brass or silver. If this switch is in the down position the second switch three way switch works as long as one switch is in the up position.
Scott first gives an explanation of the three way switch two switches that control one light fixture. The following image shows a typical spdt toggle switch with its terminals. Each switch powers one or the other leg at all times. The white neutral should only be connected to the light fixture not either switch. Make sure only one switch has the hot going to the common. There are a pair of wires that run between the two switches.
For wiring i have selected the standard way with a 37v lithium ion battery as the power supply.
Gallery of 3 Way Switch Only Works When One Switch Is On
