What type of safety control must be installed if the ignition source for the flame special effect cannot be confirmed?

In scenarios where the ignition source for flame effects cannot be confirmed, implementing a primary safety control is essential. This type of control is designed to provide a fail-safe mechanism to prevent unintended ignition or hazardous situations. The primary safety control is typically integrated within the flame effect system, ensuring that all necessary precautions are in place to manage the ignition source effectively.

In the context of the NFPA 160 Standard, this control can include automated systems that monitor ignition parameters and are designed to abort the ignition sequence if conditions are not safe. By prioritizing the integrity of the ignition source check, the primary safety control enhances the safety of both the performers and the audience.

While other options, like a backup ignition system or a manual override switch, can certainly add layers of safety, they do not replace the need for a robust primary safety control that governs the main ignition process. Each piece of equipment in a flame effect should have a primary safety measure to ensure reliability and adherence to safety protocols outlined in the NFPA 160 Standard.