This diagram illustrates wiring for a 4 way circuit with the electrical source at the light fixture and the switches coming after. Two-wire cable is run from the light to SW1 and 3-wire cable runs between all the switches. The hot source is spliced through to the common terminal on SW2 and the hot terminal on the light fixture is connected to the common on SW1. The travelers run from SW1 to T1 on the 4 way and from T2 to the travelers on SW2. Note that the white wire is wrapped with black electrical tape when it is used for hot in these circuits.
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.
In this circuit a split receptacle is controlled by two separate switches. With this arrangement two lamps can be plugged into the same receptacle and each can be controlled separately from two different locations.
A 3-wire cable runs from L1 to L2, 2-wire cable runs from there to the first switch, and 3-wire cable runs between SW1 and SW2. The source hot is spliced to the black wire running between the lights and at the last light, it is spliced to the black wire running through to the common on SW1. The white wire is marked black and spliced to the black wire running to the common on SW2.
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