The more I review and perform arc flash calculations, I realize that the table provided in 70E for PPE levels, is inappropriate to keep in the standard. In many situations, I find the notes (not even fpn) do not apply to the situation due to slower than noted clearing times.
In order to use the table, and to verify whether the table notes apply, you have to calculate a bolted fault current, then the associated arc fault current, then find a copy of the OCPD characteristics to see how long it takes for the device to clear. In many cases, I find that the arc fault current only activates the OCPD in the short or long time region which eliminates the possibility of using the table.
The table seems to be there for folks not able to perform the calcs, but you need to do some preliminary calcs to see if the table and the associated notes apply at all. Doesn't make logical sence to me to have the table, as it will give a false sence of security to someone when the ignore the notes.
