for dishwashers some inspectors require lockouts, and some don't, but 422.31(B) says you need them, and some guys that don't want to use them say the dishwasher has a unit switch so don't need them per 422.34
422.31 uses 1/8 horsepower or 300VA to say either a disconnect within sight is needed or a lockout, so i assume this is why you don't need the lockout for the range hood fan, but i've seen some electricians use them
i think 424.19(C) is used the same way for wall heaters so they don't always use lockouts for them saying they have unit switches
do you use them? i'm not sure what a unit switch is. it's not in the definitions
