IEC 60320-1:1994 Appliance couplers for household and similar general purposes - Part 1: General requirements
IEC 60529:1989 Degrees of protection provided by enclosures (IP code)
SNI IEC 60320-2-3:2012 history
2012SNI IEC 60320-2-3:2012 Appliance couplers for household and similar purposes Part 2-3: Appliance couplers with a degree of protection higher than IPXO