BS 3052:1958

Fixed supply units for flush or surface mounting containing a transformer having separate input and earth-free output windings and an output socket (or sockets) for the supply of electric dry shavers rated at more than 30 volts r.m.s. a.c. and not more than 250 volts a.c. Ouput sockets for: British 2-pin reversible plugs and shaver socket outlets (BS 4573); American 15 A 110 volt parallel-blade attachment plugs (Underwriter's Laboratories Standard for attachment plugs and receptacles (non-polarized)); European 10 A 2-pin plugs (CEE Specification No. 7).