Two-hour protection of circuits and a fully sprinklered building corresponds to which survivability level?

• A. Level 0 survivability
• B. Level 1 survivability
• C. Level 2 survivability
• D. Level 3 survivability

Answer: (D)

Survivability level describes how long and how well the fire alarm system can stay operable during a fire, given protective measures in place. When critical circuits are protected for two hours and the building is fully sprinklered, the system is designed to withstand the heat and damage of a fire long enough to keep power and signaling available while fire suppression helps control the scene. This combination represents the highest level of survivability, Level 3, because it combines extended circuit protection with comprehensive fire suppression to maximize the chances that the system continues to function throughout the incident.