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[pvignola]

I have purchased and installed a WS467. It is connected to an incandescent light.  When the light is on there is a hum coming from the switch.  Is this normal and OK?

[Puck]

It is normal for Triac Dimmers to hum.

Here's another post with the same question (and some info):

WS12A Decora Dimmers buzzing

[TakeTheActive]

Is a HUM similar to a BUZZ? Wall Switches  (Read 2042 times)

[dave w]

Is a HUM similar to a BUZZ? Wall Switches  (Read 2042 times)

Nope, a hum is at least 10dB down. 

[KDR]

I have not so good hearing. I mostly hear barking. I can hear a buzz but never hear a hum. Thats why all my wall switches work perfectly. X10 turns them on and off so I never touch them. So they must be running cool and quit. 

[dave w]

Yup. If a tree falls in the forest and no one is around ..............

[-Bill- (of wgjohns.com)]

... the squirrel still gets flattened!   

[nklght]

Is the hum comming from the switch of or the light?  Is the light in a dim status?  I have noticed that lights dimmed using an X-10 wall switch tend to make a horrible noise, altough lights controlled a plug in module are quiet.  The key is to make sure the lights on the wall switch are full on or off.  The second you start dimming a wall switch the horrible sound starts, and it gets worse the more you dim it.  I have several lights using plug in modules and wall switches, everytime I dim them the wall switch controlled lamps create a horrible noise.  I have several wall switches installed and we started hearing a bad hum, after my In-Laws came to visit, a couple of days latter it was pitch black and we noticed a subtle glow from certain fixtures.  The In-Laws never turned them off, just dimmed them to point in which they were not visible.  We hit the few switches, and stopped the noise.