Which standpipe system is intended for use by trained building personnel and firefighters?

The Class II Standpipe System is specifically designed for use by trained personnel within the building, such as trained staff or firefighters, in the event of a fire. This system is equipped with 1.5-inch (38 mm) hose connected to a water supply and is typically located in accessible areas of the building. It is targeted primarily at aiding occupants and trained building staff to combat small fires before the firefighting team arrives, as they can directly utilize the hoses and nozzles attached to this system.

In comparison, the Class I Standpipe System is designed mainly for use by firefighters and utilizes 2.5-inch (65 mm) hoses, making it more suitable for fire service use, without direct engagement by building personnel. The Class III Standpipe System combines elements of both Class I and Class II, but it is not the primary designation for personnel training. As for the Public Fire Alarm System, it is used for alerting occupants and does not provide the direct means to combat fires like the Class II system does. Thus, the Class II Standpipe System's purpose aligns with providing a practical and immediate firefighting resource for trained building personnel and firefighters.