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NM cable 3-wire to 2-wire?


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Am I allowed to use 3-wire (plus ground = 4 wires) NM cable for a connection that only needs 2 conductors (+ ground)? If so, how do I flag the wire that's not being used? Can I just put a screw-on splice cap over it at both ends?

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Am I allowed to use 3-wire (plus ground = 4 wires) NM cable for a connection that only needs 2 conductors (+ ground)? If so, how do I flag the wire that's not being used? Can I just put a screw-on splice cap over it at both ends?

Just coil up the extra wire and tuck it into the back of the box. If you want to put a cap on it, go ahead.

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