[Milsurplus] AC Power on Ships

[Richard Brunner]

One last word on grounded vs ungrounded AC power systems.  For years the
NEC has been pushing grounded systems for, I believe, entirely specious
reasons.  Today you will only see ungrounded systems used where
continuity of service is very important, such as refineries, chemical
factories, cement works, etc.  On a ship grounded is ok until you
connect to shore power, then stray currents go through sea water to the
hull and the hull starts to dissolve.

Richard, AA1P