Typical plugs and sockets according to two spherical pins with centres spaced at 19 mm are in use in Europe, a lot of that happen to be detailed in IEC/TR 60083 "Plugs and socket-outlets for domestic and similar common use standardized in member countries of IEC. The middle-to-Centre distance of https://johnnywipxf.blogs100.com/29850220/types-of-electrical-plugs-outlets-fundamentals-explained