you already have two phases with the double breaker in the p

panel box. This one is in the AC unit, with two hots each going into one side of the 60A breaker.

 

This kind of 60A is used specificaly for the AC, as it does not have the tied double toggles.

Frankly I don't understand since you have breaker in the panel box why you will need this one in the AC unit.

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