@ Trumpy: Well the plug is a stadart grundet Plug of an extension cord - think it looks only that huge because of the perspective. You also can see it again on the last picture. Maybe that it appears a bit huge, but inbetween it's "law" (of the BGI) that extension cables in professional use are H07RN-F cables, shockresistant, IP44 (->protectet against spraywater and foreign body) ...the germans and their safetymania ;-)
@Alan Belson: The aluminium is not groundet, because unter the aluminium of the socket the black plastic isolates all (Safety-classII (of VDE 0701/1)). The al. is only on Top for additional stability.
On the receptacle itself you also can fix it with two screws, but it isn't common here.
The "awful" crocodile teeth are very good for the installation in ferroconcrete..., it's easy to install and you don't have to drill additional holes - the also last very long. I Think ca. 90% of all sockets, switches... here are installed that way. The additional Screwholes in the framework are for additional strenght and not that usual in livingrooms ;-)
And why here 230/400V 3-Phase (L1 L2 L3 N G) Systems are common... don't know the history of this developement?
the sequenced assembly pics will follow!
