MrWizard wrote:
I am a retired electrician , worked years in commercial residential and industrial, I don't recall any NEC that says a generator installed in a mobile vehicle on land, has to bond the neutral to ground
NEC 250.34(C) is where the requirement is stated, if I'm not mistaken, albeit in the usual opaque way the NEC states these things. Where there is both a shore power cord and the generator, the generator is part of a separately-derived system, and as such must have the neutral bonded to ground. Presumably the same requirements would apply to built-in inverters interconnected to the RV electrical system via a transfer switch.