If the pump has a rated capacity of 750 gpm or greater, the fire apparatus must be subjected to an overload test lasting at least:

The require duration for an overload test on a fire apparatus with a rated capacity of 750 gallons per minute (gpm) or greater is five minutes. This length of time ensures that the apparatus can sustain its operations under conditions that exceed the normal operating load, which is crucial for maintaining reliable performance during emergency situations.

Testing for five minutes allows for a thorough assessment of the pump’s performance under stress, checking for overheating, maintaining stable pressure, and ensuring that all system components can handle higher flows without failure. By adhering to this standard, fire departments can ensure that their equipment will function effectively when it's needed most, thus enhancing the safety of operations and the communities they serve.

Other durations, while they may not be relevant in assessing pump performance under overload conditions, do not provide the same level of assurance for reliability and readiness in demanding scenarios. Therefore, the five-minute test is a critical standard within industry practices.