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If you examine a three-way switch , you will notice several differences when compared to standard single-pole switches.
Understanding Three-Way Electrical Switches
Although these push fittings or slot-fittings may be the quickest way to connect a switch, this method is not recommended, as it is generally less secure.
At any given moment when the light fixture is on, the power may be flowing through either the black or the red traveler wire.
Description: By doing this one wire at a time, you can ensure you are connecting the new switch correctly.