Here two 3 way switches control a wall receptacle that may be used to control a lamp from two entrances to a room. This circuit is wired the same way as the 3 way lights at this link.
In this updated diagram 3-wire cable runs between the receptacle and SW2 to allow for splicing the neutral source through to the second switch box. Here the white is not used for hot but instead the extra, red wire serves that purpose for the second switch.
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Three-way switches have 3 terminals to carry circuit electricity and one terminal for a ground wire. Of the three circuit terminals, one is called the common and the other two are known as travelers. The common terminal may be labeled and is usually a different color than the traveler terminals.
If your switches stop working they may be worn out or the screws may have come loose. If you’ve wired a new switch correctly and the circuit still doesn’t work, the switch may be defective. Check that all connections are tight. Check the switch, remove it from the circuit and test for failure with a continuity tester or multimeter set on the Ohms setting.
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