Red Seal Plumbing Practice Exam

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Which of the following will cause a single interlocked pre-action system to trip during a fire?

  1. Opening of a water valve

  2. Earthquake

  3. Activation of fire detection system

  4. Power outage

The correct answer is: Activation of fire detection system

A single interlocked pre-action system is designed to activate its fire suppression mechanism when it senses both heat and smoke. Options A and D are incorrect because they are not specific triggers of the pre-action system. Option B may cause damage to the system, but it will not trigger it. Option C is the most likely cause for the system to trip during a fire because the fire detection system will sense the presence of fire and activate the pre-action system.

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