Buck Boost Transformer

You may be right that the ship could be 480. Especially if the ships plug is 480. A standard 250 volt plug would be sufficient with the high leg system. Didn’t look up the plug #, but is probable pin and sleeve. If the ship has transformers in the electrical room, most likely it is 480, same with the onboard generator could be checked. With all the bad info they have given you, might be time to run from this job! LOL!
 
What a confusing story, from a building to a ship. from 208/120 utility supply, needing a buck boost to 240 1Φ, then finding out it has a center tapped 3Φ 240 delta utility service, to a listed 200A 480V 4W shore receptacle. with no neutral provided at the receptacle.
Then no mention of the additional loads that were to be added? Then claiming the ship runs off of a 240 V 3Φ ungrounded system but has some 120V single Φ loads.

Does this boat ever leave lake Michigan? Having a 480V plug on a 240V boat sounds like a accident waiting to happen if it leaves the dock it is stationed at.

Sounds to me like it has a ungrounded 3Φ 240V supply, then it should have some ground fault detection on board. i think it's common for larger boats to have ungrounded systems with ground fault detection systems onboard.

Sounds like it needs a lot more investigation before you start changing panels and adding transformers and equipment.

my first concern would be a 480 3Φ ship to shore chord and plug for a 240 3Φ boat. That could be very detrimental at the wrong port.

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