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Old 06-26-2012, 04:03 AM   #1
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Hot Screw on Dimmer Switch


Hey all!

I have a 1000 watt dimmer switch ganged in a box with a 600 watt dimmer switch. The chart I have says to derate the 1000 watt dimmer to 800. It's controlling 10 65-watt floodlight bulbs, and one of its wall plate screws is hot. Not hot enough to burn but hot enough to be uncomfortable to touch for more than a few seconds. The other 3 screws are warm-ish but fine. Is this normal?

Thanks!

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Old 06-26-2012, 08:56 AM   #2
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Hot Screw on Dimmer Switch


Yes..

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Old 06-26-2012, 04:10 PM   #3
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Hot Screw on Dimmer Switch


No, that is not normal.
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Old 06-26-2012, 06:40 PM   #4
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Hot Screw on Dimmer Switch


Can you offer any advice?
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Old 06-26-2012, 09:41 PM   #5
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Hot Screw on Dimmer Switch


Can you offer any advice?
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Old 06-27-2012, 12:20 AM   #6
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Hot Screw on Dimmer Switch


Please, only this one thread on exact same question, someone will be along soon, thank you, Gary.
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Old 06-27-2012, 12:27 AM   #7
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Hot Screw on Dimmer Switch


There is one surefire tip which I done this all the time is get the metal switch plate cover and that metal switch plate will act like heat sink.

The question is how hot it is??

Some of the dimmers can run warmer than other brand names will do.

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Marc
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Old 06-27-2012, 05:57 AM   #8
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Hot Screw on Dimmer Switch


If you can improve the air flow behind the dimmer,
The heat build up will improve !
But yes it is normal for dimmers to get quite warm.
The components are usually rated for 85 degree's celcius.
So warm to you is cool for the components.
Also using a metal fascia plate will help dissipate some
of that heat.
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Old 06-27-2012, 06:27 PM   #9
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Hot Screw on Dimmer Switch


Quote:
Originally Posted by rubberhead View Post
No, that is not normal.
Yes it is...
During normal operation, dimmers do get warm to the touch. Wallbox dimmer efficiency is typically around 99%. The other 1% is dissipated in the dimmer as heat. So a dimmer on a 600W load would produce around 6 watts of heat. This is on the order of a small nightlight. Operating on itís rated load, Lutron dimmers will stay below the UL limits of 140oF (60oC).
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Old 06-28-2012, 06:27 PM   #10
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Hot Screw on Dimmer Switch


If you derated it like the manufacturer suggested, it will operate within normal specs. Having a hot switch is perfectly fine when it comes to dimmers as they dissipate the extra energy as heat. A hot dimmer is not anything to be alarmed over.

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