Install Single-pole Switches

The first step in installing a single-pole switch is to turn off the power to the circuit that you’ll be working on. To do that, simply go to your electrical panel and turn off the breaker feeding that circuit.

To check this, use an electrical tester to see that the power is on before you turn off the breaker and then off after you turn off the breaker. If the switch controls a light in the room, verify that the light is off after turning off the power at the electrical panel.