Just a simple dimmer (slide) switch
I installed a modern slide style dimmer switch, with on/off switch included, a couple of days back.
Must be just my poor memory it seems, for when looked at the fact the dimmer had three wires I wondered why. Two black to be connected in series/line with the hot line going to the light, and one green. Of course the green is earth ground, but why? Safety? The box didn't have the earth ground wire so I put the green wire under the screw that holds the dimmer to the metal electrical box.
Is there something important about the green wire I am missing?