What is the maximum distance an underground main can be installed under the building to the riser location without additional requirements?

What is the maximum distance an underground main can be installed under the building to the riser location without additional requirements?
A . 2 ft (0.6 m)
B . 5 ft (1.5 m)
C . 10 ft (3 m)
D . 15 ft (4.6 m)

View Answer

Answer: B

Explanation:

NFPA standards allow a certain distance for underground mains to run under a building to the riser without imposing additional requirements. A distance of up to 5 ft is commonly accepted, providing a practical allowance for connecting the underground water supply to the building’s sprinkler system while minimizing potential risks.

Reference: NFPA guidelines for the installation of fire sprinkler systems, including considerations for underground water supply connections.