Thank you all for the very quick answer!
@Bill: Yes I did look at the drawings and have made pictures of these. Which would you like? From the pictures you have uploaded ours is rather different, have uploaded to the link you supplied.
@Olivier: Ok that is the one then! I have found it but did not know it was it, attached is the image of what we have and there is nothing connected to it. Do not know when and which electrician has circumvented it. The original inverter has been replaced with a Victron unit.
@Jamie: We have the converter too! As seen on the image.
Next actions: Will have a look in the coming days and see if the GE has too been rewired to somewhere else.