What's With My Boat's Shore Power Wiring Colors?

A reader recently sent in this photo from his boat showing the behind the scenes look at his shore power selector switch. His question has to do with whether or not the wiring color codes on his boat are compliant with regulations or industry standards. He tells us he is a licensed electrician and he’s never seen the light blue that is quite prevalent used in an installations.  So, what’s up with this? Nothing, other than the fact that the boat was quite obviously (to me) built in Europe ...