God I answered this before
US 240 Vac is called split phase, but this is a historical misnomer. all it is is 240VAC single
phase with leg effectively floating. if you take a isolated
oscilloscope, and connect it across the two hot wires you will see a standard single
in the EU, while increasingly uncommon, floating 230VAC is seen, hence reverse polarity lights on a EU boat sometime makes no sense and are not typically fitted. The boat if wired to code must be safe with the hot and neutral mixed.
Its entirely "possible" to connect a 240VAC split phase system directly to a EU 230 VAC 2 wire system. Note that US split phase is a "two wire" system , it is not 4-wire, thats just whats at the plug
HOWEVER, the main safety
issue is that while
there should be no neutral to ground wire connections on a EU boat, they could have been added. SO the first thing to verify is that there is no connection on your boat between any of the AC wires and protective earth.
Secondly you really need a RCBO, a residual current
circuit breaker, if this is a EU boat IT WILL BE PRESENT. This will at least go aways to protecting inadvertent shorts to ground.
There is no specific issue with such wiring
, in Europe
, one never ever assumes the neutral wire is " dead" and it is afforded exactly the same protection as the live.
without a RCBO , The other issue is that you do have an unprotected fault path from one side of the split phase to ground. this will not be run through your boards AC breakers. But your RCBO will catch it.
SO here my checklist
1. verify no inadvertent live or neutral connection to protective ground on the boat ( do this with a dead AC system !!!) , i.e. there should be no short. ( you have in effect already tested this by the fact that your boat powered up on split phase !!)
2. Ensure a suitable whole boat RCBO is fitted.
3. Preferably have double pole AC breakers in your panel, many boats now do , but not all.
4. If you don't understand this, DONT DO IT.
5. its not a great permanent system.
The reverse polarity light is itself is not an issue and is somewhat meaningless in europe
. Your boat should be AND MUST BE under CE regs , still safe if the polarity is reversed.