08032017 The common wire is associated with the differently colored screw on a 3way switch so its the black screw in your case Ignore the green ground screw of course As others suggested and in accordance with your situation the black is the common wire and the red is the traveler wire assuming this is for a three way switch
you may see this video: The Best 3 Way Switch Explanation Ever
The common wire is associated with the differently colored screw on a 3way switch so its the black screw in your case Ignore the green ground screw of course As others suggested and in accordance with your situation the black is the common wire and the red is the traveler wire assuming this is for a three way switch
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3way Switch Wiring Electrical 101 httpswwwelectrical101com 3wayswitchwiringusin
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