Chapter 3 of NFPA 731 contains general definitions used in the standard. It is important to understand what is considered an “Annunciator”.

A security system has several key components such as a control panel, or “brain” of the security system; keypads which allow the user to deactivate or activate the security alarm system and check the alarm system status through a visual display; sensors in various predetermined locations which detect activity within the secured area; lights, sirens, bells, that alert when the security sensors detect any activity within the premises security system; and an annunciator, which is a visual indicator showing the location of a security breach.

Annunciators indicate the exact location of an alarm or problem in the system such as motion, faulted doors or windows or glass breakage. The annunciator panel is the place to go to find out where an alarm has been set off or to see the status of the security sensors in specific locations around the premises. Many keypads also contain visual displays or lights to announce alarm system events.

There are many types of annunciators. Some are for security only, others are for fire alarms, while others can be used for both fire alarm and security systems.

Below is a sample of NFPA 731. For the complete section, see the actual NFPA 731 text at NFPA.ORG. Once there, click on the free access link to the latest edition of NFPA 731.

3.3.4 Annunciator. A unit containing one or more visible or audible indicators, alphanumeric displays, computer monitors, audible indicators, or other equivalent means in which each indication provides status information about a circuit, condition, system, or location.