The common wire is usually black and the travelers red, in any case, the traveler wires will usually be the same color to distinguish them from the common. The stranded wires on the dimmer are spliced to the cable wires from the circuit.
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.
This receptacle can typically be found in living room and bedroom wall outlets. One of these may be controlled with a switch and/or wired to other receptacles in the circuit. For a 15 amp receptacle like this, 14/2 cable with ground should be used to feed the circuit.
This wiring shows the light fixture and the electrical source between the switches. Three-wire cable runs throughout and the hot source is splice to the common on SW1. The common on SW2 is spliced through to the hot on the light fixture. The travelers from SW1 are spliced at the fixture outlet box to run to the 4 way switch.
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