How many sprinklers can be on a Pre-action system?

A pre-action sprinkler system is a type of fire protection system that requires two triggers to activate the sprinkler heads: a detection system must first identify the presence of heat or smoke, followed by the activation of the water supply before sprinklers can discharge water.

The standards set by the National Fire Protection Association (NFPA), specifically NFPA 13, outline the maximum allowable number of sprinklers that can be served by a single pre-action system. The correct answer indicates that a pre-action system can support up to 1000 sprinklers. This limit is designed to manage the system's function and effectiveness in detecting fires, as well as ensuring that the water supply remains efficient and effective while minimizing the risk of accidental discharge.

This ensures that the system can provide adequate coverage for the protected area while balancing hydraulic calculations and system limitations.