Question 509Electricity & Electronics - QMED

The correct answer is D) Shore power phase sequence must agree with that of the ship. When connecting shore power to a ship in drydock, it is crucial that the phase sequence of the shore power matches the phase sequence of the ship's electrical system. This ensures that the voltages and phases are properly aligned, preventing potential damage to the ship's equipment and electrical system. The ship's generators are rated at 450 VAC, 60 Hz, but the specific voltage and frequency values can typically accommodate a small tolerance range, so A and C are not strictly required. Additionally, the total capacity of the shore power does not need to precisely match the ship's generator capacity, as long as it is sufficient to meet the power demands, making B an incorrect answer.