resqcapt19,
I don't think that is realistic, as you are aware time to the point that the arc is extinguished plays a role in the energy equation. I agree that all the things you talked about can happen, but it's better to have protection based on what will most likely occur and more defensible from an economic standpoint. We all know hot work is going to be done, at the very least particularly of the testing nature (how else can you verify the de-energized state)