What happens if you get the red and black wires of a four prong dryer cord backwards?
This question assumes:
- we are talking about U.S. Residential wiring
- the person doing the wiring gets the green and white wires in the right place
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To clarify, there is really no such thing as them being backwards. Red/black, black/red, X/Y, black/black; it's all the same thing.
This is why you'll never see them identified by color. Typically in a 4-wire installation like this (NEMA 14-30 in this case) the two hots will be identified simply as X & Y.