Which device activates when the sprinkler system operates?

Which device activates when the sprinkler system operates?

• A. Thermal Element
• B. Listed or Labeled
• C. Water Closet
• D. Alarm Device

Answer: (D)

When a sprinkler system operates, the thing that actually signals the event is the alarm device. The heat from a fire causes a sprinkler head’s thermal element to release water, but the alarm device is what activates (usually through a waterflow or pressure switch) to alert occupants and the fire department. The other items aren’t the signaling device: the thermal element is part of how the head opens, a water closet is unrelated, and listed or labeled refers to approval status, not a signaling function.

When a sprinkler system operates, the thing that actually signals the event is the alarm device. The heat from a fire causes a sprinkler head’s thermal element to release water, but the alarm device is what activates (usually through a waterflow or pressure switch) to alert occupants and the fire department. The other items aren’t the signaling device: the thermal element is part of how the head opens, a water closet is unrelated, and listed or labeled refers to approval status, not a signaling function.