IEC/ISO symbol 6092The IEEE (Institute of Electrical and Electronics Engineers) have recognised the problem with PAT testing these power supplies and introduced a new symbol especially for this type of equipment in 2011. The symbol is a combination of the familiar double insulated, square within a square symbol, and the existing symbol for a functional earth. The new symbol is now on the IEC/ISO database of approved graphical symbols for use on electrical equipment. IEC 62368-1 has also been modified to include the use of the new symbol. IEC 62368-1 is the latest international safety standard for audiovisual products and information technology equipment. It is expected that this standard will eventually replace IEC 60950-1 (safety of ITE). So hopefully this symbol will start to be used on laptop chargers and similar equipment sometime in the near future.
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