What must be electrically supervised by a listed fire alarm control unit in all sprinkler systems?

In a sprinkler system, electrical supervision is critical for ensuring that all components function effectively during a fire emergency. A listed fire alarm control unit is essential for monitoring various system elements to ensure they are operational and can respond appropriately to a fire event.

Pumps, which are responsible for supplying water to the sprinkler system, must be electrically supervised to ensure they are ready and can operate when needed. Tanks, which hold the water supply for the sprinkler system, also require supervision to confirm their status and readiness. Waterflow switches are crucial because they detect the flow of water in the system and can activate the fire alarm if water is flowing, indicating that the system has been triggered by a fire.

Since all these components—pumps, tanks, and waterflow switches—must be monitored by the fire alarm control unit to maintain system integrity and allow for a timely response to fire incidents, the correct answer encompasses all of these critical elements. Thus, the supervision of all these components by a listed fire alarm control unit is vital for the effective operation and reliability of the sprinkler system in a commercial building.