Ron,
as it will give a false sence of security
It is my opinion that using the trip or clearing times for a breaker also provides a flase sense of security. What if the breaker settings have been changed? What if the breaker doesn't work? If it is a large system with protective relays, what if the batteries that provide the trip current are dead? I think that the PPE should be based on the arc flash that would occur if the OCPD does not operate.
Don
