ICC Certified Fire inspector One Practice Test

Under what height requirement are two risers needed for a sprinkler zone?

1. 30 feet

2. 40 feet

3. 50 feet

4. 55 feet

The correct answer is: 55 feet

For a sprinkler zone, the requirement for the number of risers is primarily dictated by the height of the building or the vertical distance the sprinkler system needs to cover effectively. Specifically, when the height exceeds 55 feet, the National Fire Protection Association (NFPA) and other relevant codes stipulate that two risers are necessary to ensure adequate water supply during a fire. This requirement is in place to enhance the reliability and performance of the sprinkler system. When a building reaches significant heights, relying on a single riser can compromise the system's ability to deliver water pressure and coverage uniformly throughout the zone. Two risers help distribute the water supply more efficiently, thereby improving the effectiveness of the sprinkler system in controlling or extinguishing a fire. In the context of this question, understanding that the height of 55 feet triggers the need for additional risers is critical. By adhering to this requirement, fire safety professionals can ensure that the sprinkler system is designed and implemented to meet the rigorous demands of taller structures, thereby enhancing overall fire safety within those environments.