I'm planning to use a generator to bridge longer power outages. Both the house and the generator are single-phase. If the main breaker is off, it will only disconnect the phase, the neutral will still be connected to the grid. Now if a generator is added, it would share neutral with the power grid. Is that a problem?
Disclaimer: I'm aware of all the other risks involved. The generator will only have 2KW, all bigger sinks will be unplugged prior, the circuit used for the feed supports 10A @ 230V and already hosts most of the devices that need powering.