IEC 60906-2:1997

Applies to the IEC system of plugs and socket-outlets rated 15 A
125 V a.c. for household and similar purposes for the connection of
equipment to distribution systems having nominal voltages between
100 V and 125 V a.c. in so far as dimensional requirements are
concerned.

The object of this part is to provide a standard for a safe,
compact and practical IEC 125 V system of plugs and socket-outlets
that could be accepted by many countries as their national
standard, now or in in the near future. It is therefore recommended
that any country in need of a new or replacement system for the
nominal voltage range 100 V to 125 V a.c. adopt this standard as its
only national standard.