Sliding Dimmer Switch Is Warm To The Touch - Electrical - DIY Chatroom Home Improvement Forum

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Old 05-30-2010, 10:19 PM   #1
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Sliding Dimmer Switch is warm to the touch

Is a dimmer switch (sliding type) generating a detectable amount of warmth (through the faceplate) cause for alarm?

The switch is all the way up.

Note: This switch does not have a "click" locked feeling all the way up. Does this mean that it likely has no separate fully closed connection at the top that bypasses the variable circuitry?

(variable resistor, or whatever).

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Old 05-30-2010, 10:47 PM   #2
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Warmth is normal. Count up the wattage on the bulbs being controlled by the dimmer. When you take the faceplate off you'll see the watt rating for the dimmer (usually 600 watts), if you're close to that, consider putting in smaller wattage bulbs or disabling a few lights. If neither of these ideas are practical, consider a larger dimmer.
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Old 05-31-2010, 03:18 AM   #3
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Some case what I will do is install the metal switch plate as well that will act like heat sink to help the dimmer to work more cooler and many case it do help a bit.

The very large dimmer { 1500 w and 2000 W dimmers } have standard heat sink included with the dimmer and majorty of the time you will have to mount this size dimmer on it own junction box due the heat sink size.

Also if you have couple other switches even other dimmers or fan speed control in there you will have to derate the dimmer as well.

There is listing if you take the cooling fin off it will tell you how many watts it will reduce or the numbers of switches in the box that will afffect as well.

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