In my free time I fix my RV too.  Among other things.  Like building plastic and RC models.

I am on the US side of the ponds, (east or west), and also a facility manager of a smallish corporation.  I work with US type 110-120, 240-277 and 480 volts AC systems.  I know just enuf to stay alive, but that's todays forecast.  I might be dead tomorrow from electrocution.  LOL.  If you are Euro, then I cannot help. Those chaps do it all bass-ackward.  But if you are US based I might be able to help you.