Question 314Electricity/Electronics - Assistant Engineer70% to pass
In an ungrounded distribution system, as compared to a normal indication, what is the indication on a switchboard of a current carrying conductor making an accidental electrical contact with a wiring metal conduit?
AI Explanation
The correct answer is B) totally darkened switchboard ground-detecting light.
In an ungrounded distribution system, if a current-carrying conductor accidentally makes contact with a metal wiring conduit, it would create a ground fault. This ground fault would cause the switchboard's ground-detecting light to go completely dark, indicating the presence of the ground fault.
The other answer choices are incorrect because: A) the wattmeter reading would not be lower, but rather would be higher due to the ground fault; C) the voltmeter reading would not be higher, but rather would be lower due to the ground fault; and D) the power factor meter would not read 1.0, as the ground fault would affect the power factor.
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