What system must be operational and regularly tested?

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The key idea is that life-safety systems used to alert people in an emergency must be ready to function and be checked regularly. A fire alarm system is responsible for detecting fire conditions and quickly warning occupants so they can evacuate. Because its purpose is timely notification and evacuation, it has to stay fully operational and undergo routine testing and maintenance to verify that detectors, the control panel, alarms, and power supply all work together. Regular testing helps catch faults before they matter in a real event and keeps the system compliant with safety standards. Other options are important for safety, but they are not centralized systems that require the same level of regular, system-wide testing to ensure immediate alert and evacuation.