What is the specified time interval for an intermittent fire alarm trouble signal to sound?

The specified time interval for an intermittent fire alarm trouble signal to sound is every 10 seconds. This 10-second interval is a standard requirement in various fire alarm codes and regulations, as it ensures that the trouble signal is both noticeable and allows sufficient time for occupants to respond appropriately without causing unnecessary alarm fatigue. This frequency helps maintain awareness of any issues within the fire alarm system while ensuring that the situation does not escalate into a false alarm scenario. Furthermore, this timing interval also balances the need for prompt attention to system faults with the practicalities of managing alarms in populated environments.