Thanks. C/O contactor coils are fed from the supplies but crossed over
through the opposite contactor. With a mechanical interlock, the new
supply cannot be engaged until the first supply has been switched off.
Genset - is before inverter. Using Victron multi plus inverters -
probably 2 in parallel - and their wiring diagrams have genset/shore
selection first as inverter can boost AC supply from battery if shore
or genset output is not sufficient to meet load.
Have all sorts of parts of circuit diagrams!! - still drawing up the
full one. Imverter 2 and 3 are only 600W and have very low quiescent
consumption. Rather than leaving main inverter running, these 2 can
handle CH and fridge.
Ground wire switching - not sure either and cannot recall reason!!!
I'll have another look.