Question 72Electricity & Electronics - Assistant Engineer

The correct answer is C) shore power phase sequence must agree with that of the ship. When connecting shore power to a ship in drydock, it is critical that the phase sequence of the shore power matches the phase sequence of the ship's electrical system. This ensures that the voltages and currents on each phase are properly aligned, preventing damage to the ship's electrical equipment. The voltage and frequency of the shore power can typically vary within certain tolerances, as long as the phase sequence is correct. The other options are incorrect because: A) the shore power does not need to match the total capacity of the ship's generators, as the ship's electrical load may be less than the full generator capacity; B) a slight frequency tolerance is typically allowed as long as the phase sequence is correct; and D) the voltage from shore power can have a small tolerance as long as it is within the acceptable range for the ship's electrical system.