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Basic Dimmer Switch Wiring Question

Joined
9 Dec 2008
Messages
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Location
Illinois
Country
United Kingdom
Hey people..

I am replacing a dimmer light switch but things have somehow gone awry.

The electric box in the wall has:
2 black wires that are already fastened together
1 single yellow exposed wire

My dimmer switch has:
2 black wires
1 green wire

Can anyone shed some light on how the wiring configuration would be?
 
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