CEE 7

The CEE 7/7 plug shown here (middle) is the shape-based intersection of two previously incompatible connectors. It made it possible to largely unify the European market without replacing a single socket, because it no longer matters whether the sockets provide grounding clips (CEE 7/3, left) or a grounding pin (CEE 7/5, right).

CEE 7 is a standard for alternating-current (AC) plugs and sockets for household and similar purposes. First published in 1951 by the former International Commission on the Rules for the Approval of Electrical Equipment (IECEE), it unified standards produced by several continental European countries. The project resulted in a list and numbered group of power connecter systems.

Interactive 3D model of a CEE 7/7 plug compatible with Type E and Type F sockets.

In Europe, CEE 7 connectors are the sole standardised system in use (and therefore often referred to as "European plugs/sockets") with the exceptions of Italy (with San Marino), Denmark (including the Faroe Islands), Great Britain (including Gibraltar) with Ireland, Malta and Cyprus, and Switzerland (including Liechtenstein), each of which use their own systems. CEE 7 is also the sole system in many other countries outside the region such as Indonesia, Iran, Egypt, DR Congo, Morocco, Madagascar and South Korea.

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