When using the arc flash PPE category method (for AC systems), the estimated available fault current at the equipment to be worked on must be equal to or less than the available fault current parameter value for the type of equipment in Table 130.7(C)(15)(a).

• A. True
• B. False
• C. Not applicable
• D. Only for DC systems

Answer: (A)

The key idea is that arc flash protection using the PPE category method is tied to how much fault current could be available at the equipment. For AC systems, the table 130.7(C)(15)(a) provides, for each type of equipment, a maximum available fault current value. To select the correct PPE category, the estimated fault current at the job site must be equal to or less than that equipment-specific value. If the estimated fault current exceeds the table value, the PPE category based on that table would not be sufficient, and you’d need to de-energize or use a higher level of protection. This approach is specific to AC systems; DC has a separate consideration.