In automatic foam-water deluge systems, detection equipment shall be connected to what?

• A. Water deluge valves and other system-control equipment
• B. The building's HVAC
• C. The fire alarm only
• D. The building power supply

Answer: (D)

The main idea here is that detection devices in automatic foam-water deluge systems must be integrated with the building’s fire alarm system. When a detector is triggered, it should initiate not only the release of foam/water but also alarm notification throughout the building and supervision of the system. This coordination ensures occupants are alerted promptly and the system’s activation is monitored and recorded by the fire alarm panel.

Connecting detectors to the building’s fire alarm system, rather than to HVAC or simply to the building’s power supply, provides reliable signaling and interlocks with other life-safety functions. HVAC systems are not a dependable signaling path for fire events, and power alone doesn’t provide the necessary alerting and supervisory features. While detectors do require power, the code requirement is about signaling and control integration with the fire alarm system, not just energizing devices.