The perimeter for explosions should be established at ___ times the distance from farthest piece of debris found.

• A. 1.0 times
• B. 2.0 times
• C. 3.0 times
• D. 1.5 times

Answer: (D)

Establishing a safety perimeter around an explosion uses a buffer beyond where debris is found to cover the possibility that fragments can travel farther than they initially appear. The standard guidance is to set the perimeter at one and a half times the distance to the farthest piece of debris. This extra margin accounts for unpredictable fragmentation, wind effects, and secondary projectiles, giving responders a safer area to operate and investigate. Using a smaller distance could miss outlying debris and hazards, while a much larger perimeter can overly restrict access without substantially increasing safety in typical scenarios.