A single-pole dimmer allows you to dim the lights with one switch (usually a dimming knob). A 3-way dimmer allows you to turn the light on and off with one switch while dimming the light with the other switch or dimming knob.

For the dimmer switch to work properly, use a dimmable bulb. Installing an incompatible dimmer might cause the lights to flicker, stay in one lighting range, or not come on at all. Standard dimmer switches are not compatible with ceiling fan lights, as they can weaken the fan motor and cause it to overheat. Call a licensed electrician to install separate switches for the ceiling fan and the light bulb.

When you’re working with multiple light bulbs, add up the wattage of each bulb. Then, find a dimmer switch with a rating that is compatible with that amount. If you have 4 100-watt bulbs (400 watts in total), then a 300-watt dimmer switch would not be enough. Purchase a dimmer switch with a 600-watt maximum to ensure the switch works properly.

Electrical panels are usually located in the garage, basement, laundry room, or closet space of a home or apartment. [4] X Research source If you’re not sure which breaker switch corresponds to the light switch, turn off each switch one by one and see which one shuts off the light. [5] X Research source Purchase a non-contact voltage tester online or at a home improvement store in your area. Apply the non-contact voltage tester to the breaker switch that controls the light switch to make sure there is no electrical current.

To remember the proper wire configuration, consider labeling the wires with electrical tape or taking a photo.

The hot wire is usually red or black. The neutral wire is usually white. For an additional reference, see if your dimmer switch came with wiring instructions and refer to those throughout the process.

If you intend to make any adjustments to the wiring yourself, always remember to switch the breaker off again first.

Buy a non-contact voltage tester online or at a local home improvement store if you don’t have one. To use it, touch the voltage tester to the switch on the circuit breaker.

If you plan on making any changes to the wiring, remember to always turn the breaker off first.