Time delays shall be used only for which purposes?

• A. To ensure personnel evacuation only
• B. To perform a system test
• C. To prepare the hazard area for discharge
• D. For personnel evacuation or to prepare hazard area for discharge

Answer: (D)

Time delays are built into a clean agent system’s actuation to give people time to respond safely and to get the hazard area ready before the release. The purpose includes both letting personnel evacuate and preparing the area for discharge, such as ensuring access and safety measures are in place before the agent is released. That’s why the option that includes Evacuation or to prepare the hazard area for discharge is the best fit—the two functions together capture the intended use of delays.

Using time delays for testing isn’t appropriate, since testing requires a separate procedure and sequence, not a delay built into the normal discharge initiation. Limiting the delay to only evacuation or only preparation is narrower than required, as both functions are allowable and sometimes needed in practice.