DIN EN 60491 ; VDE 0882:1996-10 [Withdrawn] references following documents:

Document number Edition Title
IEC 60799 1984 Cord sets More 
IEC/TR 60536 1976 Classification of electrical and electronic equipment with regard to protection against electric shock More 
IEC/TR3 60083 1975 Plugs and socket-outlets for domestic and similar general use. Standards More