Marine Electrical Systems USCG Question #813 (Set 28)

When shore power is being connected to a ship in dry dock, what must be ensured, assuming that the ship's generators are rated at 450 VAC, 60Hz with a total capacity of 5000 kW?

Official USCG Answer & Rule Citation

Correct Answer: Option C — shore power phase sequence must agree with that of the ship

Connecting shoreside electrical power to a vessel requires absolute verification that the shore supply phase sequence matches the shipboard system to prevent severe reverse rotation and catastrophic damage to connected electric machinery per IEEE 45.

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