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This wire is sometimes red.
How to Replace a Light Switch
There may be other wires in the box, but you are only dealing with the ones connected directly to the switch.
Two or three wires will be attached to the switch: an incoming hot wire, which is black; a return wire, which carries the load to the fixture and may be black, red, or any other color except green; and sometimes a grounding wire , which is green or bare copper.
Description: The loop must wrap at least two-thirds but no more than three-quarters of the way around the terminal screw.