Texas Fire Alarm License Practice Test

What spacing measurement is required when multiple detectors are used on a ceiling?

1. All points must have a detector equal to 0.5 times the listed spacing

2. All points must have a detector equal to 0.7 times the listed spacing

3. All points must have a detector equal to the listed spacing

4. No specific measurement is required

The correct answer is: All points must have a detector equal to 0.7 times the listed spacing

When multiple detectors are placed on a ceiling, the requirement dictates that all points must have a detector coverage equal to 0.7 times the listed spacing. This ensures that the coverage provided by the detectors is effective and reliable in detecting smoke or heat within the space. The reason for using 0.7 times the listed spacing is to account for factors like ceiling height, obstructions, and potential air movement that can influence the distribution and behavior of smoke or heat. By adhering to this standard, designers and installers of fire alarm systems can ensure that there are no gaps in coverage which could allow smoke or heat to go undetected. This measurement helps create a more robust and compliant fire protection system, ultimately contributing to a safer environment in the event of a fire.