CEE 7 is a standard for alternating-current plugs and sockets. 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 2nd edition was published in 1963 and last updated in March 1983. It remains available from the IEC, but they state that "this standard shall not be used alone, it is to be used in addition to IEC 60884-1".