Which of the following statements is true regarding the installation of mortar racks?

The statement regarding the location of mortar racks, indicating they must be at least 50 feet from the audience, is accurate according to NFPA 1123 guidelines. This requirement is rooted in safety concerns, as maintaining a safe distance minimizes the risk of injury to spectators. The principle is to ensure that any potential projectile from the fireworks has sufficient space to travel safely and that the audience is protected from the effects of the display, including noise and possible fallout.

In the context of fireworks safety, the distance between the mortar racks and the audience is crucial for crowd control and firework fallout management. This distance also considers factors such as wind direction and other environmental conditions that could affect the flight path of the fireworks.

Other statements may be true in particular circumstances or reflect different safety concerns, but they do not align with the specific requirements laid out by NFPA 1123 regarding the location of mortar racks. For instance, height restrictions and securing methods may vary based on specific conditions. However, the mandatory distance from the audience seeks to provide a fundamental protective barrier that is consistently applicable in most display scenarios.