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A 208/230 volt single phase motor only has two wires out. It sounds like you are trying to pick up a feed from a 120/240 source that needed a neutral wire to operate. The black and red wire will give you the voltage you need. Make sure that you use a starter and overload protection for the motor.

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Q: Wiring a single phase 208 230V compressor to residential 240 using existing 6 3 wire B W R and a ground but compressor only has a two wire and ground requirement?
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