What type of personnel primarily uses a Class II Standpipe system?

A Class II Standpipe system is specifically designed for use by trained building personnel during initial response situations, such as a fire or other emergencies within a commercial or residential building. This system typically includes a hose and nozzle that is ready for use and provides a quick and effective means to combat small fires before the arrival of the fire department.

The rationale for this choice lies in the intended use of Class II Standpipes, which are installed primarily for the assistance of individuals who are not specifically part of the fire department but who have received training on how to use the standpipe system effectively. These trained building personnel, such as designated safety officers, are familiar with the operation of the standpipe and can quickly engage it to control a fire within the building.

The other options involve personnel who either may not be equipped or trained to use the standpipe effectively (like untrained building occupants) or are intended for different roles in emergency situations (such as emergency medical services or fire department personnel trained in heavier equipment and fire streams). Thus, while all are critical in an emergency response context, the design and purpose of a Class II Standpipe system align closely with trained building personnel for immediate action.