Power (NEMA & IEC & CEE) Connector Guide | C2G The IEC 320 C13/C14 connectors are based on standards created by the International Electrotechnical Commission, an international standards body. The "320" refers to the number of the specification that describes power connectors. The official text of the standard is actually numbered 60320, but common vernacular usage shortens it to 320. Connector Basics - learnkfun IEC connector usually refers to the power supply inlet which is commonly seen on desktop PC power supplies. Strictly speaking, that's an IEC 60320-1 C13 (female) and C14 (male) connector. C14 male IEC power inlet, on a DC project power supply.