Well, it depends on how much of a load the dishwasher is. Start at 422-10(b) which refers to 210-23 if the circuit will supply the dishwasher and other loads.
If the dishwasher is cord & plug connected & is portable, it cannot exceed 80% of the circuit rating.
If the dishwasher is fastened in place, it cannot exceed 50% of the circuit rating if the circuit also supplies any of the other loads mentioned in 210-23(a).
Few things are harder to put up with than the annoyance of a good example.
