[RFI] Lutron and RFI

Charles Gallo Charlie at TheGallos.com
Mon Nov 20 19:27:33 EST 2006

I have a good friend who is in engineering at Lutron (software end,

I asked him about various dimmers and RFI and his reply (snipped of
"how the family is doing stuff") is below


To paraphrase the racing guys, RFI suppression costs money. How low do you
want to go?

There are a couple of factors involved--one is how the device responds to 
noise on the line before we dim, the other is how we do the dimming.

The best possible solution is made for hospitals and MRI centers--zero RFI. 
Lotsa bucks. The next best solution is our GP dimming panels--very little 
RFI, but lotsa bucks. Then comes our LP dimming panels, with the new 
FET-based A-series dimming module. Much more modestly priced, but this is 
still Lutron. (Depending upon how much the electrical contractor marks it 
up, you're still probably around a hundred dollars per circuit or so.)

Want more? Here's the Lutron FAQ for RFI:


Note the last suggestion--install an electronic low-voltage lighting 
system, with an ELV dimmer. Then comes the big tip: a separate neutral. 
Lots of times these days electricians will wire a building with a common 
neutral--combining the white wires and running a lot of circuits back to 
the panel on a single white wire. This is a bad thing to do--because you 
get all kinds of nasty noise on the line, and the noise appears on all of 
the circuits. But it happens (it saves the contractor wire).

73 de KG2V

For the Children - RKBA!

"MOLON LAVE" ("Come and Take Them")
 -- King Leonidas

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