Here a single-pole switch controls the electricity to a light fixture. The source is at the switch and 2-conductor cable runs from there to the light. The source hot wire is connected to the bottom terminal on the switch and the top terminal is connected to the black cable wire. The neutral wire from the source is spliced to the white cable wire and continues on to the light. At the light, the white wire connects to the neutral terminal and the black wire connects to the hot.
This diagram illustrates the wiring for a split receptacle with the top half controlled by SW1 and the bottom half always hot. The receptacle is split by breaking the connecting tab between the two, brass colored terminals. The tab between the neutral, silver terminals should remain intact.
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.
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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