Which of the following is NOT a FPB distance listed for any voltage category in the material?

• A. 4 feet
• B. 11 ft
• C. 13 ft
• D. 15 ft

Answer: (D)

Flash Protection Boundary distances define how far from live parts a worker should stay to limit arc-flash exposure, with values tied to voltage categories and the tasks being performed. The material provides a table of FPB distances for different voltage categories, reflecting the level of arc energy expected and the corresponding PPE and procedures needed. In that table, 4 feet, 11 feet, and 13 feet are listed as FPB distances for various categories, but 15 feet does not appear anywhere in the table. So, 15 feet is not listed as an FPB distance for any voltage category in this material. This means it’s not a defined boundary you would use from that resource, even though it could be a conservative or situational distance in other contexts. Use the distances that the material explicitly provides for the relevant voltage category.