What is the rule regarding racks containing mortars greater than 6 inches in diameter?

Racks used for fireworks displays must adhere to strict safety standards outlined in NFPA 1123. According to this standard, racks that contain mortars greater than 6 inches in diameter are not permitted. This rule is established primarily due to the increased hazards associated with the handling and launching of larger mortars.

The rationale behind this restriction is primarily safety-focused; larger mortars produce more powerful explosive forces, which can lead to more significant hazards if they malfunction or if safety protocols are not followed stringently. By prohibiting the use of racks designed for any mortars exceeding this size, NFPA 1123 aims to minimize risk to crew members, spectators, and the surrounding area.

This prohibition ensures that only appropriately sized mortars are used in installations that can safely support the performance and containment of their shock waves and explosive force. Thus, this rule helps enhance the overall safety of fireworks displays.