Within how many seconds must a trouble signal be returned to normal?

The correct time frame for a trouble signal to be returned to normal is 200 seconds. This is established to ensure that any issues related to the fire alarm system are promptly addressed, maintaining the integrity and functionality of the alarm system. By having this specific time requirement, it allows monitoring personnel or technicians sufficient time to respond to and rectify any fault conditions without allowing the system to remain in a compromised state for too long. This adherence to the 200-second rule is crucial in fire safety protocols, as it helps ensure that alarms are reliable and capable of functioning properly in an emergency situation.

It's important to understand this context within fire safety standards, as it emphasizes the need for quick resolutions to any operational issues within fire alarm systems to ensure public safety.