Question 380Electricity/Electronics - Assistant Engineer70% to pass
Concerning the illustrated fire detection and alarm system, when the system is operating normally and under supervision, what is the status of the ground detector and the fire alarm relays? Illustration EL-0114
AI Explanation
The correct answer is C) The ground detector relay is de-energized and the fire alarm relay is energized.
Under normal operating conditions with the system under supervision, the ground detector relay should be de-energized, indicating that there is no ground fault in the system. Meanwhile, the fire alarm relay should be energized, ready to trigger the fire alarm if a fire is detected.
The other options are incorrect because: A) The ground detector should be de-energized, not energized, under normal conditions. B) Both relays should not be de-energized, as the fire alarm relay needs to be energized. D) Both relays should not be energized, as the ground detector relay should be de-energized under normal conditions.
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