The primary hazard to responders rescuing victims near a fire involving hazard class 1 is:

The primary hazard to responders rescuing victims near a fire involving hazard class 1 is:

• A. Explosion
• B. Fire spread
• C. Toxic fumes
• D. Structural collapse

Answer: (A)

Explosives can be extremely sensitive to heat, shock, and friction. In a fire contact, heat inside the explosive material can initiate detonation, producing a powerful blast overpressure and high-velocity fragments. This immediate, violent energy release is the most dangerous threat to rescuers, because it can occur suddenly and injure or kill people nearby and damage equipment within the blast radius. While fire spread, toxic fumes, and structural collapse are real hazards, they are secondary to the immediate, life-threatening danger of an explosive detonation in this scenario.

Explosives can be extremely sensitive to heat, shock, and friction. In a fire contact, heat inside the explosive material can initiate detonation, producing a powerful blast overpressure and high-velocity fragments. This immediate, violent energy release is the most dangerous threat to rescuers, because it can occur suddenly and injure or kill people nearby and damage equipment within the blast radius. While fire spread, toxic fumes, and structural collapse are real hazards, they are secondary to the immediate, life-threatening danger of an explosive detonation in this scenario.