Engineering · Electrical — Distribution
Most merchant ship electrical distribution systems are:
- ALow-voltage DC only
- BThree-phase AC, commonly 440 V, with an ungrounded (insulated) neutral✓ Correct
- CSingle-phase AC grounded to the hull
- DHigh-voltage DC with a grounded return
Explanation
Merchant vessels typically use three-phase 440 V AC with an insulated (ungrounded) distribution so a single ground fault does not trip the system, improving continuity of supply.
Authority: Marine Electrical (USCG engineering topic)
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