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Dimmer switches are used to control lighting level and can save energy. Dimmers work by limiting the voltage that goes to a lighting load. Dimmers work very well with incandescent bulbs because of a wide dimming range. Find Dimmer Switches
For other types of bulbs including CFLs, halogen, and LEDs, check to see that they are “dimmable” on the bulb package. Dimmable CFLs are usually more expensive and have a limited dimming range, mostly at the dim end.
Dimmer Switch Usage
Common dimmer wattage ratings are 150 watts, 300 watts, 600 watts and 1000 watts. 150 watt rated dimmers are usually for a single bulb. Wattage rating is usually on a sticker on the light fixture.
1. Multiply the number of fixtures by the wattage rating of each fixture.
2. Multiply the result by 125 % (continuous load).
3. Round up to the next dimmer wattage rating.
Dimmer wattage calculation example:
1. 5 fixtures x 60 watts = 300 watts.
2. 300 watts x 1.25 = 375 watts.
3. Next higher wattage dimmer rating = 375 watts or higher (600 watts).
While older rheostat type dimmers do not, modern dimmers do save energy when dimming lights. Dimming lights also extend the life of incandescent light bulbs.
Dimmer Feels Very Warm
It is normal for a dimmer to feel warm especially if the lighting load is close to the dimmer rating. A higher wattage dimmer may need to be installed if the following apply:
Dimmer switches usually have two black wires protruding from the back of the switch. One wire connects to the light(s), the other connects to the line. The green wire connects to ground. If a dimmer has one black wire and one red wire, usually the black wire connects to the line and red wire to the load.
Ground connection is not shown.
A 3-