Which of the following is not a parameter that must be satisfied to use the arc flash PPE category method?

• A. The incident energy at 18 inches working distance shall not exceed 8 cal/cm2
• B. The protecting-OCPD and the 480-volt panelboard have been properly installed and maintained
• C. The OCPD typical clearing times are used as described in the Informational Note to Table 130.7(C)(15)(a)
• D. The panelboard has been de-energized before work

Answer: (C)

The arc flash PPE category method is a simplified way to pick PPE based on the hazard risk category determined from the anticipated incident energy at the working distance. In this method, you use a chart that links your working distance and system voltage to a PPE category, with the choice guided by whether the incident energy at that distance stays within the limit for the chosen category (for example, a threshold like 8 cal/cm2 at 18 inches). So, you must consider the energy at your working distance and ensure it fits the category you’re selecting.

The statement about using the typical OCPD clearing times is not a requirement for applying the PPE category method. Those clearing times are part of the energy-based (incident energy) analysis and are discussed in the Informational Note related to the table used for energy calculations. That approach needs the OCPD clearing times to estimate energy, but the PPE category method does not rely on those clearing times to determine the PPE category.

Conditions like the protecting OCPD and panelboard being properly installed and maintained support a valid and reliable hazard assessment and safe work plan, and de-energizing the panel eliminates arc flash risk, which also affects how you approach the task. However, the core input distinction is that typical OCPD clearing times are not used when you’re applying the PPE category method itself.