What is the green screw on my new switch for?
Because people have been replacing plastic switch covers with decorative metal ones, code has now required the switches to be grounded, so that the covers attached to them will never be able to shock if a hot wire or terminal were to get loose and touch either. So to put the new switch in right, you’ll dig the bundle of ground wires out from the back of the box and pigtail a wire from them to this green screw.
