My upstairs hall has a 4 way set up to contol the upstairs hall lighting. one switch at bottom of stairs one switch at each end of the upstairs hall. question: can I use a dimmer on ONE of the switches? I tend to think not, 'cause I can not get the darn thing to work properly! i.e. not all switches can switch on and off. I have a book on wiring, it says you can only have one dimmer on a 3 way, does not mention 4 way switch set up. I've finally got the darn wiring figured out (40+ y/o house - its copper wiring BTW) Currently (no pun intended), with the dimmer switch on, the other 2 can independently turn on and off the lights. If the dimmer is off, nuthin' with the other 2 switches thanks and yes I turned the breaker off when messing with it!