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Old 11-12-2009, 09:07 PM   #1
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Dimmer humming, screws warm


I have a dimmer that is humming, and when I touch the screws holding the cover on, those are hot.

This dimmer is controlling 2 sconces, and a chandelier.

Does anyone know what might be wrong?

TIA

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Old 11-12-2009, 09:21 PM   #2
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Dimmer humming, screws warm


You need to know the total wattage of all the bulbs and wattage of dimmer.

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Old 11-12-2009, 09:26 PM   #3
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Dimmer humming, screws warm


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You need to know the total wattage of all the bulbs and wattage of dimmer.
Bulbs are either 40 or 60 x 8 and I don't know what the dimmer is.

Do is the dimmer probably under either 320 or 480w?
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Old 11-12-2009, 09:29 PM   #4
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Dimmer humming, screws warm


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Originally Posted by abefroman View Post
I have a dimmer that is humming, and when I touch the screws holding the cover on, those are hot.

This dimmer is controlling 2 sconces, and a chandelier.

Does anyone know what might be wrong?

TIA
(What does TIA stand for? Totally Inadequate Answer?!) So here goes; Possibly. You're overloading the dimmer! Or you have an Inductive load on it. (CFLs?) Points to check; a) Rating of Dimmer vs. load; b) Quality of load. Inductive? Reg. fluorescents, CFL, Ceiling fan, Etc. c) Loose Connection:
Yes. I read that you have 2 sconces and a chandelier. But is there another load connected that you didn't notice?
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Old 11-12-2009, 09:35 PM   #5
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Dimmer humming, screws warm


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Originally Posted by spark plug View Post
(What does TIA stand for?....
"Thanks in Advance"

Now for the dimmer issue:

Whenever you operate a dimmer at or near capacity, it will get warm, or even hot to the touch. The aluminum front on most dimmers is there to act as a heat sink to dissipate the heat build-up from normal operation.

Installing a plastic wall plate can aggravate this condition, as plastic is an insulator. This is indicated by the hot plate screws.

Try using a good, thick, metal wall plate. The plate screws won't get as hot, and while the entire plate may get warm, it won't get as hot as the dimmer is now, and it should work better in the long run.
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Old 11-12-2009, 09:49 PM   #6
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Dimmer humming, screws warm


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Originally Posted by kbsparky View Post
"Thanks in Advance"

Now for the dimmer issue:

Whenever you operate a dimmer at or near capacity, it will get warm, or even hot to the touch. The aluminum front on most dimmers is there to act as a heat sink to dissipate the heat build-up from normal operation.

Installing a plastic wall plate can aggravate this condition, as plastic is an insulator. This is indicated by the hot plate screws.

Try using a good, thick, metal wall plate. The plate screws won't get as hot, and while the entire plate may get warm, it won't get as hot as the dimmer is now, and it should work better in the long run.
Thanks!
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Old 11-12-2009, 09:55 PM   #7
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Dimmer humming, screws warm


Quote:
Originally Posted by kbsparky View Post
"Thanks in Advance"

Now for the dimmer issue:

Whenever you operate a dimmer at or near capacity, it will get warm, or even hot to the touch. The aluminum front on most dimmers is there to act as a heat sink to dissipate the heat build-up from normal operation.

Installing a plastic wall plate can aggravate this condition, as plastic is an insulator. This is indicated by the hot plate screws.

Try using a good, thick, metal wall plate. The plate screws won't get as hot, and while the entire plate may get warm, it won't get as hot as the dimmer is now, and it should work better in the long run.
As a matter of fact the commercial, Heavy Duty Dimmers used in Thaters (or Theatres as spelled in Canada) have a larger "Heat Sink" plate in front and are derated when installed in the same 2-gang box. Thank for explaining TIA.

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Last edited by spark plug; 11-12-2009 at 09:57 PM. Reason: missing word ("Have")
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