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scottmatt 04-17-2008 09:57 PM

Dimmer causing interference - Help
 
I've purchased a dimmer switch (3 way) to control some recessed cans (Halo) in my basement. However, the dimmer switch hums and when on causes EMI to travel along the coax feeding my HDTV. With the switch turned off the EMI goes away. Is it a faulty dimmer? I swapped it out for a non-dimming switch, and the EMI is not a problem when the lights are on.

Thanks!

ElectricianJeff 04-18-2008 06:38 AM

Quote:

Originally Posted by scottmatt (Post 117178)
I've purchased a dimmer switch (3 way) to control some recessed cans (Halo) in my basement. However, the dimmer switch hums and when on causes EMI to travel along the coax feeding my HDTV. With the switch turned off the EMI goes away. Is it a faulty dimmer? I swapped it out for a non-dimming switch, and the EMI is not a problem when the lights are on.

Thanks!

Make sure your dimmer is sized to handle the load. Dimmers are sized based on the load (watts) they need to handle.

Jeff

scottmatt 04-18-2008 07:23 AM

Quote:

Originally Posted by ElectricianJeff (Post 117228)
Make sure your dimmer is sized to handle the load. Dimmers are sized based on the load (watts) they need to handle.

Jeff

Thanks Jeff. There are a total of 6 cans on that switch (all using Low-E CFL's 14w usage for 65w equivalent). So to calculate the load, do I just multiple the amount of cans by the wattage of the cfl's?

Jim Port 04-18-2008 07:33 AM

Are these dimmable CFL's? Most are not.

scottmatt 04-18-2008 08:23 AM

Quote:

Originally Posted by Jim Port (Post 117233)
Are these dimmable CFL's? Most are not.

The CFL's currently installed are not...but ultimately (after construction) I plan to install Dimmable CFL's (expensive buggers!).

I thought that might be the problem, but even when the dimmer is set to full power, the problem persists.

ElectricianJeff 04-18-2008 10:08 AM

Quote:

Originally Posted by scottmatt (Post 117242)
I thought that might be the problem, but even when the dimmer is set to full power, the problem persists.

Pull the CFL's and put in some incadesants. You problem may go away.

Jeff


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