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rjl24 02-20-2008 05:54 PM

Dimmer Installation
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I have a two gang box with originally had a 3 way switch and a single pole switch. In the process of attempting to replace the single pole swith with a dimmer, we are now totally lost!

The box contains 5 main groups of wires (I have attached a rudimentry diagram)

group 1: one red wire, one white wire, one black wire , and a copper ground wire.

group 2: one black wire (hot),one white wire, and a copper ground wire

group 3: one black wire, one white wire, and a copper ground wire

group 4: one black wire, one white wire, and a copper ground wire

group 5: one black wire, one white wire, and two copper ground wires

Because of the single hot black wire, I am assuming the single pole switch drew power from the 3 way switch.

Has anyone wired anything similar?


chris75 02-20-2008 05:56 PM

Why dont you just install the dimmer in place of the single pole and not take apart every splice in the box?

joed 02-20-2008 06:03 PM

How much it have you taken apart and how much is still the way it was before you started?

chris75 02-20-2008 06:09 PM

YOU need to find out where the wires go and remake the splices accordingly, This isnt something you can just ask someone off the street... :)

220/221 02-20-2008 07:43 PM

There are a couple of ways this might go. It all hinges on your group 1 wires.

If you took them apart, wire nut group 2 thru 5 whites back together.

Turn the power on and CAREFULLY touch the hot black wire to the other black wires one at a time to determing whick ones go to your 2 diferent sets of lights (operated by the original single pole and 3 way). I WILL make a slight arc spark when you touch them and the lights will go on.

Instead of working it hot, you should turn off the breaker, attach the blacks with a wire nut (one at a time) and tun it on. You will have to run back and forth about ten times but it will be safer....more safe...whatever.

Identify these black wires as your 2 switch legs.

There are many ways that the 3 way might be wired so if you get this far and determine that both switch legs are in this box I will guide you the rest of the way. The switch leg MAY be in the other 3 way box.

Be careful.

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