What requirement is there for notification appliances, including voice and visual devices?

The requirement that notification appliances, including voice and visual devices, must be listed for the purpose for which they are used is crucial for ensuring safety and reliability. This listing by a recognized testing laboratory indicates that the device has been evaluated and meets specific standards for performance and safety in alarm systems. Such appliances are designed to operate effectively under defined conditions, and using listed devices ensures compliance with codes and regulations that govern fire alarm systems.

This requirement helps prevent the use of substandard or inappropriate devices that could fail during an emergency, thereby ensuring adequate notification to occupants in case of a fire or other emergencies. The credibility and reliability of the devices are paramount in maintaining public safety, making this requirement essential in fire alarm system installations.