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How Does a 3-Way Light Switch Work?
How one can Disconnect a Wire From a Light Switch
A two-way light switch requires a three-way cable (three wires plus ground–four conductors in all) to be run to ensure that the sunshine to be switched from any station. Which means that at any time, either switch could also be upside-down in order that it’s on within the down position or off in the up position. The wiring in the wall must be re-wired if there is simply two-way cable in existence. Adding another wire to the present installation won’t end up being as easy as pulling through the right cable to replace the old one.
The third wire provides for the flexibility to change from either end of the cable. The switches used in each location have to be two-way switches, providing a choice between two different directions for the electric current. That is the wiring behind the lighting circuits that save time, like the light switch within the kitchen that switches the light within the garage off, and the identical circuit may be switched off at the front end of the garage, saving you having to return to the kitchen. Another application can be the sunshine on the stairway on different floors, saving you from having to go up or downstairs to get the switch.
How it really works
Two of the three wires carry current to either end of the installation. The third provides the redundant switching at either end. The ground wire is common to the entire installation and must not be used for anything aside from grounding at either end. Color-coding is crucial. The red wire is the “traveler” wire and is the one that carries the switched current from one switch to the opposite. The 2 black cables are the “hot” (live) cables that have the ability switched into the circuit and the green cable is the ground that’s wired between all of the devices.