Initiation of sprinkler heads may be activated by which devices?

Initiation of sprinkler heads may be activated by which devices?

• A. Heat sensors, fusible link, or manually
• B. Water pressure changes
• C. Electrical switches
• D. Automatic timers

Answer: (A)

Sprinkler heads are designed to respond to heat. Each head carries a heat-sensitive element—such as a fusible link that melts at a preset temperature or a glass bulb that ruptures—to release the head and allow water to discharge. Manual actuation is also possible, where a person activates a release to start water flow. Because the initiation of sprinkler heads depends on these heat-responsive mechanisms or manual triggering, they are the valid devices for activation. Water pressure changes don’t directly fire a specific head, and electrical switches or automatic timers aren’t used to initiate the heads themselves.

Sprinkler heads are designed to respond to heat. Each head carries a heat-sensitive element—such as a fusible link that melts at a preset temperature or a glass bulb that ruptures—to release the head and allow water to discharge. Manual actuation is also possible, where a person activates a release to start water flow. Because the initiation of sprinkler heads depends on these heat-responsive mechanisms or manual triggering, they are the valid devices for activation. Water pressure changes don’t directly fire a specific head, and electrical switches or automatic timers aren’t used to initiate the heads themselves.