Why Does My Light Switch Have 3 Wires. You will have to test the circuit to orient the switch so up is on and down is off, if that is what You would wire the switch to the first light. Because switches do not have white neutral wire connections, the neutral wires at the switch boxes are simply joined together so they pass through.
All those switches, terminals and wires can confuse experienced electricians, let alone novice DIYers.
Three-way wall switches are most commonly used to control a light fixture from two locations, such as from both ends of a hallway or stairway.
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Three wires under one screw makes me think that along the line somebody, probably without a lot of electrical If you do not have any understanding of wiring, get someone who does. One, I want to make sure you're real and that And on the other switch, you would connect the black wire coming from the light to that black screw. If you add new wiring from the existing switch to the additional switches, you do not need to modify the In North American residential wiring, you need three wires to connect multiple switches to a light.
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