NEC® Article 430.52 Exception 1 states that if the values for branch-circuit protective devices as determined using the percentages in Table 430.52 do not correspond to the standard device sizes or ratings, then the nearest smaller size rating or setting should be used.

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NEC® Article 430.52 Exception 1 actually states that if the values for branch-circuit protective devices as determined using the percentages in Table 430.52 do not correspond to the standard device sizes or ratings, then the next higher standard device size or rating can be used, provided it does not exceed 800% for motors other than hermetic refrigerant compressor motors, or 250% for hermetic refrigerant compressor motors.