Which source provides the OCPD typical clearing times used as a parameter in the arc flash PPE category method?

Which source provides the OCPD typical clearing times used as a parameter in the arc flash PPE category method?

• A. The Informational Note to Table 130.7(C)(15)(a)
• B. Article 100
• C. NFPA 70E
• D. Table 130.7(C)(15)(a) itself

Answer: (A)

The PPE category method for arc flash hazard analysis uses how long an overcurrent protective device takes to clear a fault as a key input. Those typical clearing times aren’t shown inside the PPE category table itself; they’re provided in the Informational Note that accompanies Table 130.7(C)(15)(a). That note lists representative clearing times for common OCPDs, which you use as the reference when selecting the appropriate PPE category. The other sources don’t supply these time values: Article 100 is about definitions, NFPA 70E is the overall standard, and the table itself presents the PPE categories and requirements but not the clearing-time data. So the Informational Note to Table 130.7(C)(15)(a) is the correct source for the OCPD clearing-time values.

The PPE category method for arc flash hazard analysis uses how long an overcurrent protective device takes to clear a fault as a key input. Those typical clearing times aren’t shown inside the PPE category table itself; they’re provided in the Informational Note that accompanies Table 130.7(C)(15)(a). That note lists representative clearing times for common OCPDs, which you use as the reference when selecting the appropriate PPE category. The other sources don’t supply these time values: Article 100 is about definitions, NFPA 70E is the overall standard, and the table itself presents the PPE categories and requirements but not the clearing-time data. So the Informational Note to Table 130.7(C)(15)(a) is the correct source for the OCPD clearing-time values.