Which factor is crucial regarding the time taken for water to reach the inspector's test?

The crucial factor regarding the time taken for water to reach the inspector's test is that it should not exceed 3 minutes. This time limit is significant because it ensures that the sprinkler system can deliver water effectively and promptly to the test location, which is critical for verifying the system's operational integrity. A prompt delivery of water indicates that the system is functioning as designed, which is essential for ensuring life safety and property protection in the event of a fire.

If the water takes longer than this specified time, it may suggest issues such as pipe obstructions, insufficient pressure, or malfunctioning components within the sprinkler system. Such delays could compromise the system's reliability and effectiveness during an actual fire incident. Therefore, adhering to the 3-minute limit is vital for both compliance with industry standards and ensuring that the installation is capable of performing as required.