This is one of the places where the NFPA 70E rules become very confusing. The boundaries you refer to are for SHOCK hazard, not flash hazard. Flash hazard and boundaries are calculated individually for the circumstance. The way it usually works out is that flash hazard PPE would be required within the shock hazard restricted/prohibited zones but not the limited zone. This is not always true however. Very high energy circumstances could extend the flash hazard areas well outside the shock hazard limited zone.
