Scott,

As we all know the code is a minimum and we all know what good mechanics should do. However if you get someone, who just wants to do the minimum, because of low bid, then I will have to quote him chapter and verse where it is enforced in the code book.
Now if he has a breaker lock on the circuit, it can be the required disconnect as per 430.109 (B).

Also by the same scenario if the attic light is on the same circuit as the bath fan and the EC locks it out to work on the fan motor, he now can't see the motor.

So if I look at a job and there is no circuit breaker lock and no snap switch for the motor should the job fail?

Maybe under sec. 430.102(B)(1)?