What is the minimum time delay allowed from ignition of a manually fired aerial shell's fuse to the lifting of the shell?

The minimum time delay allowed from the ignition of a manually fired aerial shell's fuse to the lifting of the shell is established to ensure safety during the fireworks display. This time delay is crucial for allowing the fuse to burn long enough for the ignition to occur, as well as ensuring that the operator has sufficient time to retreat to a safe distance before the shell is launched.

According to NFPA 1123, a time delay of 2 seconds is specified as the minimum. This requirement helps mitigate the risks associated with accidental ignition or misfires, allowing operators and spectators to maintain a safer distance, and affording the aerial shell enough time to achieve proper lift and flight. The 2-second delay is deemed adequate for effective safety procedures in the context of fireworks shows, making it the correct response.