Question 380Electricity & Electronics - Assistant Engineer

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.