bonding,
tapped
Aye, in theory it is trivial to make the connections and be fine under no fault conditions. It's handling the many "what if" fault conditions and still meeting the regulations for supply and installation when on grid power and when on generator power.
Which is why I use extension cables to the appliances I wish to power from the generator during power cuts. But having more than one appliance connected to a "live" and "neutral" floating generator isn't strictly legal either.
I have thought about replacing the isolator switch on the genset with a 16 A DP RCBO but if both "live" or "neutral" are floating there is no fault circuit via "earth" to unbalance the the "live" and "neutral" currents and trigger a trip.
One possibilty is to connect the earth pin of the genset output socket to the "neutral" pre the RCD. But that doesn't produce a trip if the still floating "neutral" has an earth fault condition, only if the "live" does, I think!...
I don't think there is 1/2" of regs just for generator/grid power installations/switching.