Joe,
I think that you still need a power system study to apply the simplified PPE selection because you must be sure that your system complies with the notes that apply to the table. In many cases the available power in a large industrial installation will exceed what is listed in those notes. For smaller industrial systems and many commercial systems, their may be no problem using the table to select PPE. However, if there would be an incident, and if the PPE was not adequate, I think that the employer could be cited. I guess that my bottom line, is that you must have a good idea of the available current at the point on the system where the work is to be done to use the table.
Don
