Light switch has 2 hot wires
I recently purchased a condo and am going through replacing switches and such. I have had this one switch that has always powered nothing, not a light nor a plug.
So I pulled it out to test and see if the switch itself were bad. I have a voltage tester and checked the wiring in the wall to find that I have 2 hot wires going to the switch.
There are a total of 4 wires that went to the switch, 3 black, 1 red.
I know that normally the red means "traveler" which should be used in a 3 way switch setup. I found no other switch in the house that this could turn on/off. I checked all switches on that circuit and found nothing.
In the picture the two wires to the left are the hot wires, and the two black wires to the right lead elsewhere.
One of the black wires on the right has to be hooked up for the rest of the first floor to function, and the other I did not finish with yet, but has to power something.
So I guess my question is why would there be 2 hot wires going to a light switch?