According to NFPA 25, the waterflow alarm devices should be tested to ensure that they respond within how many seconds?

The correct answer is based on the requirements set forth in NFPA 25, which pertains to the inspection, testing, and maintenance of water-based fire protection systems. Specifically, NFPA 25 outlines that waterflow alarm devices, such as waterflow switches, must be tested to ensure they activate within a certain timeframe after water starts flowing through the sprinkler system.

Testing for a maximum response time of 60 seconds ensures that the alarm is functioning properly and can alert occupants and monitoring services in a timely manner during an actual fire event. This timeframe is crucial because a rapid response can significantly enhance the effectiveness of the fire protection system, allowing for quicker evacuation and response efforts.

In this context, the other options suggest longer response times, which would not align with the safety and reliability goals of fire protection systems as set by NFPA 25. Hence, the standard specifies a 60-second maximum to maintain an efficient and effective alarm system.