T&T: loose neutral

[Pierre]

Hi friends,

we frequentely read "loose neural" on subject about inverters or 110V
onboard. Can someone lead us to a clear definition of what is a loose
neutral and what is the difference of approach between the European 230V
and the North American 115V for the use of the neutral?

That could very much help as more and more boat travel both side of the
Atlantic and as AC tend to generalize onboard.

Cheers.