Arc Fault Currents
When you click 
Arc Flash, all calculations automatically default to the integrated method. The integrated method takes into account the decreasing currents from motors and generators and also from multiple sources being switched out through protective device tripping. The integrated method is the closest to a realistic scenario. See The Integrated Method for more information.
You can also calculate arc flash using momentary, interrupting, and 30-cycle currents. Arc fault current can be set in Short Circuit Options on the Arc Flash Hazard Options tab using the Calculate Arc Flash Using setting.
