The IEC (International Electrotechnical Commission) is the international standards and conformity assessment body for all fields of electrotechnology.
A set of thirteen plugs (called the appliance inlet in the specification) and thirteen matching sockets (called the connector) are defined by specification IEC 60320. A set of 11 appliance-inlets/connectors are defined in specification AS/NZS 60320.1:2004.
The plugs and sockets have either two or three conductors to suit either Class I or Class II equipment with varying current capacities and temperature ratings.
A plug's matching socket is designated by an odd number that is one number lower than the even number assigned to the plug. Therefore, a C14 plug fits into a C13 socket, a C20 plug fits a C19 socket etc.
Connector Type Connector (1) Appliance Inlet (2) Class of Equipment (3) Maximum Temperature of Appliance Inlet(2) Rated Current of Appliance Coupler(4) (RMS Amps) C1 C2 II 70°C 0.2 C5 C6 I 70°C 2.5 C7 C8 II 70°C 2.5 C9 C10 II 70°C 6.0 C13 C14 I 70°C 10.0 C15 C16 I 120°C 10.0 C15A C16A I 155°C 10.0 C17 C18 II 70°C 10.0 C19 C20 I 70°C 16.0 C21 C22 I 155°C 16.0 C23 C24 II 70°C 16.0
Connector Type Connector (1) Appliance Inlet (2) Class of Equipment (3) Maximum Temperature of Appliance Inlet(2) Rated Current of Appliance Coupler(4) (RMS Amps) C3 C4 II 70°C 2.5 C11 C12 II 70°C 10.0