For clean agent extinguishing systems, what is the purpose of a pre-discharge alarm and time delay?

• A. To ensure personnel evacuation during a fire drill
• B. To notify the building management system only
• C. To allow personnel evacuation prior to discharge
• D. To calibrate the warning devices

Answer: (C)

The main idea is life safety through proper sequencing before releasing any clean agent. A pre-discharge alarm and time delay provide an audible/visible warning to occupants and give them a short window to evacuate before the agent is released. This pause helps protect people from exposure and allows responders to intervene or abort if the warning is a false alarm, supporting an orderly evacuation rather than a sudden discharge. It’s not primarily about drills, or notifying only building management, or calibrating warning devices—the purpose is to ensure occupants have time to leave before the clean agent is released.