Installing a dimmer switch is just as easy as installing a single-pole switch, and adjustable overhead lighting is a great improvement that adds appeal to any home. Turn off the power to the circuit at the circuit breaker or fuse box. Double check to ensure that it was turned off by flipping the switch in an attempt to operate a light, and by using a voltage tester to confirm that the wires in the box are not charged once the switch plate has been removed. Use a flathead screwdriver to remove the switch cover, and a Phillips head screwdriver to disconnect the switch from the box. Use a screw driver again to loosen the screws holding the electrical wires on the side of the switch, and then detach the wiring from the switch.
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How to Install a Dimmer Switch | how-tos | DIY
Installing a dimmer switch is a great way to save energy and create a relaxing mood in a living room, dining room, or bedroom. Some homeowners replace a light by turning off the light switch only--without turning off power at the circuit breaker. Even though this is foolish, dangerous practice, it works because turning off power at the light switch is no different than turning it off at the circuit breaker please don't ever do this. But you cannot replace your switch without turning off the circuit breaker because power is always flowing to the light switch. With your manual flat-head screwdriver, carefully remove the two short machine screws holding the outer switch plate to the existing switch. I say "careful" because, if you plan to reuse that switch plate, you will need those screws again--and they are notoriously easy to damage.
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