GreenHouser said:

One is common, one is hot, one is ground. Here in the states green is usually ground. If you open your breaker panel look at what color(s) go to the actual breaker. That one is hot or also known as (line) then if there is not a spot for a ground wire on your fan twist the common an ground together. Please don't disregard the ground wire. Not using a ground is unsafe an open for power surges.

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