Sorry this is a Canadian electrical code answer but so many requirements are equivalent between the NEC and CEC.
a service over 1200 amps or over 750 volts requires 1.5 meters (5 ft) clearance, or 2 doors if there is only 1 meter (39 inches) clearance if the exit path requires you to cross past the faulted cell.
So if the distribution had a fault on the east end of the board where the door is and you were at the west end of the room you would need 5 feet of clearance in front of the board or an exit at the west end of the room in addition to the door at the east side. The 1.5 meters is measures with any draw out equipment in its racked out position.
Rule 2-310.
