Which of the following is considered to be an initiating device?

The correct answer, the wireless annunciator, is typically not categorized as an initiating device. Initiating devices are designed to detect a change in condition and trigger a response by sending a signal to the fire alarm control panel. A manual pull station fulfills this role effectively by allowing individuals to manually activate the alarm system in case of a fire or emergency, hence it is classified as an initiating device.

The wireless annunciator serves a different purpose; it is generally used to indicate the status of a system or provide alerts but does not initiate an alarm itself. Similarly, control panels are critical in processing signals from initiating devices but do not act as initiators, and ceiling-mounted speakers are used for alarm notifications rather than initiation. Understanding the functional distinctions between these components helps clarify why a manual pull station is correctly classified as an initiating device.