Over current protection for steering-gear systems circuits that power alternating- current motors must have an instantaneous trip set at what rating?

Correct Answer: Option A — At least 175% and not more than 200% of the rated full-load current of one steering-gear motor.

46 CFR 58.25-55 mandates that steering gear motor overcurrent protection must be set between 175% and 200% of the full-load current. This specific range allows for the high starting inrush current of AC motors while ensuring the circuit remains protected against sustained faults during critical steering operations.