What does a supervisory signal indicate?

A supervisory signal plays a crucial role in maintaining the integrity and functionality of a fire alarm system. It indicates an important condition: that a specific supervised circuit or device is experiencing a change in its normal operational state, which often requires attention.

In the context of the choices, the correct response highlights the significance of monitoring and overseeing alarm systems. When an alarm is turned off, a supervisory signal is usually generated to notify monitoring personnel that a manual intervention has occurred, which is vital for ensuring that the system is still functioning properly and is ready to alert in case of an emergency.

Understanding what a supervisory signal represents is essential for safety personnel and firefighters as it allows them to quickly assess the status of fire protection systems, ensuring they are always operational and can effectively respond in case of an incident.