Marine Electrical Systems USCG Question #1028 (Set 35)

You are reconnecting a three-phase induction motor to the supply line. To prevent possible damage to the load, due to the wrong direction of rotation, what should be done?

Official USCG Answer & Rule Citation

Correct Answer: Option A — check the supply line phase sequence and motor rotation with appropriate indicators, then connect correspondingly marked leads

Checking supply line phase sequence and motor rotation with dedicated phase indicators before final connection prevents reverse rotation and subsequent mechanical damage to driven pumps or machinery loads.

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