Haven't been here in a while, just to recap on your earlier post.
The only way of getting a shock is by touching both the live and neutral at the same time.. which an RCD won't protect against anyway.
This is incorrect, in a normal neutral-earth bonded installation with RCD protection where someone touches live and neutral at the same time, current will flow to earth as well as from live to netural through the person's body.
To quote yourself, current takes every path available, not just the one of least resistance. This at least gives a chance that the RCD will protect the user assuming the fault current to earth exceeds 30mA - which is quite likely.
in a neutral earth bonded system you could touch the live and earth at the same time to get the same result so in this respect it's actually worse.
While I understand that you are saying that there is an increased number of fault scenarios, my earlier point stands and a servicable RCD will definitely trip in a live to earth fault.
Also if we removed the earth altogether from the system and isolated the inverter so it wasn't earthed either and throwing away the rcd, that would ironically be the safest option. Birds don't get electrocuted sitting on the live wire as in this situation we have an isolation transformer we shouldnt get a shock either.
The only way something could go wrong is if another appliance shorted "neutral" to the same physical ground or casing you are in contact with and also touching the live wire.
You have correctly identified the flaw in this scheme. Without monitoring, the supposedly isolated system can become referenced to earth at any time and you will be unaware until there is a fault.
Just remember that the live could just as easily be referenced to earth as the neutral. Initially this won't cause an identifiable problem. However this could lead to the casing of your inverter (or any other connected appliance) assuming a potential of -230V if there was a neutral to case fault on any appliance (which is of course isolated) potentially delivering a fatal shock to anyone that comes in contact with it.
As far as i can tell the only reason the RCBO wont trip is because youre not getting a shock.
You are correct but you now have no way of testing your RCBO in your installation so you have no idea if it will work when you need it or not.
I have a gut feeling the entire electrics industry grounds neutral for voltage stability and pretends in some far fetched situation it provides safety.
I'm sure you're joking and can appreciate that international electrical specifications are drafted by well meaning educated professionals - pro bono in my country, in the interest of public safety.