If a salute shell exceeds the maximum diameter allowed, what is a necessary condition for its use?

When a salute shell exceeds the maximum diameter allowed, it must be fired under the control of a licensed professional. This requirement is in place due to the increased risks associated with larger fireworks, which have the potential for greater explosive power and can pose significant hazards to safety.

The involvement of a licensed professional ensures that someone with specialized training and experience is managing the display. This professional is familiar with the proper safety protocols and procedures necessary to mitigate risks during the display. They can conduct the firing in a controlled manner, maintain safe distances for spectators, and properly handle any unexpected situations that may arise during the performance.

In contrast, other conditions such as allowing any operator to use the fireworks, pre-approval from authorities, or permitting their use under any circumstances do not address the critical safety and management factors necessary for handling larger and potentially more dangerous fireworks. Therefore, the proper adherence to safety standards and regulations stipulated by fire safety codes is crucial in maintaining public safety during fireworks displays.