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.
The information in the table below is based on the Australian/New Zealand Standard AS/NZS 60320.1:2004.
| 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 |