Which of the following is NOT a required parameter for using the arc flash PPE category method?

The correct answer indicates that the incident energy at a distance of 18 inches not exceeding 8 cal/cm² is not a required parameter specific to using the arc flash PPE category method. In the context of NFPA 70E standards, the arc flash PPE category method categorizes the necessary personal protective equipment based on the potential arc flash hazards present during work on or near energized equipment.

The arc flash analysis involves calculating the incident energy based on several key parameters such as the available fault current (which affects the severity of the arc flash) and the fault clearing time (which indicates how quickly protective devices will operate to clear a fault). These factors are critical in determining the overall risk and necessary PPE level. The designations of PPE categories are specifically aligned with the incident energy level calculations derived from a detailed analysis, but there is no blanket requirement that limits incident energy to a maximum of 8 cal/cm² at an 18-inch working distance.

Understanding this is crucial, as it highlights the importance of thorough risk assessment rather than a fixed threshold, which may not cover all scenarios encountered in the workplace.