What is the main purpose of an Alarm Notification Appliance in a fire alarm system?

The main purpose of an Alarm Notification Appliance in a fire alarm system is to warn people of a fire through audible or visible signals. These appliances are critical components of fire alarm systems designed to alert occupants to evacuate the building in the event of a fire. They ensure that the warning is effectively communicated to everyone within the premises, typically through devices such as horns, bells, strobes, or visual displays. The timely activation of these signals is essential for maintaining safety and can significantly reduce the risk of injury or loss of life during a fire emergency.

In contrast, other options pertain to different functions unrelated to the primary alerting role of notification appliances. For example, secure access to the building does not relate to fire safety but rather to security protocols. Monitoring power supply is an important safety measure, but it deals with system integrity rather than notification. Communicating with emergency personnel is a key function but typically occurs through other means within the overall fire alarm system rather than through the notification appliances themselves.