Hi We have a chandelier with a switch at the bottom of the stairs and at the top of the stairs.I’d like to put a dimmer on this if it’s possible?The switches in the wall now have three wires running to them.The only dimmer I can get here has places for two wires.Will this work? Please don’t tell me use the red or white wire. All the wires in the house are black. This is Mexico. Thanks

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You will need to use a THREE WAY DIMMER CONTROL to allow for controlling the lights at both ends.  You have to identify the hot wire first, and then the others are called travelers.  The travelers connect to the red wires on the dimmer.  If you get the conmination wrong, the lights will only work from one end. The colors don't really matter as long as yo identify the hot wire first.  I would cal an electrician if you are concerned about the wiring.

All our LUTRON DIMMER CONTROLS have pdf wiring instructions on the product detail pages that illustrate how to hook them up.  Just follow the link to see what I am talking about.

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