Since 16 amps sockets are different, up to what amperage the normal sockets can be used (let’s leave the wiring and fuses out of the picture)? I’m just curious.
My fuses for my normal sockets are all 10 ampere so I could not use such a device, if you swap the fuse for a higher one then you risk the wiring is not strong enough and likely insurance would not cover it.
The fuses for my three phase supplies are stronger @ 16 ampere and the sockets look like Tom’s picture