How many independent lines are required for fire alarm signal retransmission?

In fire alarm systems, redundancy is crucial for ensuring reliability and enhancing safety in case of a failure or malfunction. The requirement for two independent lines for fire alarm signal retransmission stems from the need to provide a backup path for alarm signals. This redundancy ensures that even if one line fails, the other can still carry the alarm signals to the necessary monitoring points, thereby maintaining the integrity of the alarm system.

By having two independent lines, the system can conform to industry standards and practices designed to enhance the reliability of fire alarm communications. This setup helps to reduce the risk of false negatives in alarm situations, ensuring a prompt reaction in case of an emergency. The choice of two lines balances the need for reliability with cost-effectiveness, making it a standard requirement in many regulatory frameworks.