Normally "large appliance sockets", as he put it, are 400 V / 16 A CEE, though, 32 A CEE is pretty rare in households and more a commercial thing, although you

Normally "large appliance sockets", as he put it, are 400 V / 16 A CEE, though, 32 A CEE is pretty rare in households and more a commercial thing, although you can install it, since total capacity is at least 40 A -- but usually 63 A or 100 A. 690 V is industrial (this the logical progression dictated by star-delta connection of motors), and not used in residential contexts. 125 A CEE is the largest standard size. Beyond that other connectors are used. Industrial use also sees other connectors / kinds of connections for higher voltages (up to medium voltage [couple kV]).