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In a 4 wire, 220v AC circuit, each black wire carries 110v, the white serves as the return, or negative, and the copper is the ground.

So connect the white to the negative post of whatever your using (light or switch), and one of the black wires to the other for a 110V circuit.

If you're connecting a 110v two- strand wire to a 220v outlet, connect one wire to a black post and the other to the white post.

Make sure you have a neutral. Some times the white wire is the second hot and there is no neutral.

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βˆ™ 2015-07-15 19:09:11
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Q: How do you wire a 120V circuit off a 240V circuit?
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Can you tap into a 240V circuit to get 120V?

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