ocp on motors

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I need a correct answer on a motor question? I have an air compressor thats name plate says 28.5 amps, you multiply that by 125% to find your wire size, correct and then you multiply that 28.5 times 250% (inverse time breaker) to get your o.c.p. correct? I did call Square D and found out that there QO breakers are inverse time breakers. Thanks,Bryan