Hi there -sorry I see that I've been missing messages from you because they are sometimes concealed by advertising. Perhaps it's easier if you email me directly - [email protected].Could you find out please whether and to what the earth pin of the 13Amp sockets is connected please?
Does the 240V installation include residual current detection (rcd) circuit breakers? If you look at any circuit breakers in the boat the ones ones which are rcd will have a small press to test button and an exhortation to check regularly.
Regarding the rcds, yes the 240v system is fully protected. I'll get back to you re the 13Amp socket earth. Thanks.