Minimum display site for an electrically fired show is calculated using which formula?

• A. Diameter times number of shells
• B. Multiplier times Diameter, Sum, divided by 2
• C. Sum of diameters divided by 3
• D. Fixed 100 feet

Answer: (B)

The safety distance for an electrically fired display is tied directly to the overall size of the show and a safety factor. The sum of the shell diameters captures how large the combined effects could be—larger shells create a bigger potential footprint and thus require more space. The multiplier adjusts that footprint for factors like firing setup and risk level, scaling the distance appropriately for how the show is arranged and how many firing cues are involved. Halving the product acts as a conservative adjustment, translating the footprint and risk into a practical stand-off distance that errs on the side of safety. Together, this formula ensures the minimum display site grows with bigger, more complex shows and keeps spectators and operators at a safe distance. Other simple or fixed formulas don’t account for the actual size mix of shells or the variable risk factors, so they can under- or overestimate the necessary clearance.