For a manually fired individual aerial shell, how long must the fuse protrude from the mortar?

The correct answer is that the fuse must protrude a minimum of 6 inches from the mortar for a manually fired individual aerial shell. This requirement is in place to ensure safety and to provide sufficient length for the operator to light the fuse from a safe distance, minimizing the risk of injury during the ignition process. A longer fuse length allows for a greater margin of safety, ensuring that individuals controlling the fireworks can maintain a secure distance while still being able to initiate the display successfully.

Adequate fuse length is vital for preventing accidental ignition and ensuring that the shell reaches its intended altitude before detonation. Additionally, having a fuse that meets this specified length helps fuel proper adherence to safety regulations set forth by NFPA 1123, which governs the safe operation of fireworks displays and is fundamental in preventing accidents and ensuring public safety.