What is the first requirement before installing a means to silence trouble/supervisory/alarm signals?

The first requirement before installing a means to silence trouble, supervisory, or alarm signals is that the means shall be key operated. This is critical for several reasons related to safety and security. A key-operated system ensures that only authorized personnel have the ability to silence alarms, preventing accidental or unauthorized silencing that could compromise the safety of the building and its occupants.

Key operation adds a layer of accountability; only individuals that have been trained and authenticated can deactivate alarms, which preserves the integrity of the alarm system. This approach helps to ensure that the primary purpose of the alarm system—providing a reliable notification in the event of a fire or other emergency—is maintained, as it minimizes the risk of tampering or misuse.

Other options like battery power, loudness, and wireless functions may contribute to the efficiency or functionality of the alarm system, but they do not address the fundamental need for controlled access to silencing mechanisms, making key operation paramount.