DS DS/EN 60027-1/A2
DS DSEN 60027-1A2 2007-APR-23 Letter symbols to be used n electrcal technology - Part 1 General
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This part of the standard, IEC 27-1, gives information about general quantities, units and their letter symbols and mathematical symbols that are to be used in electrical technology. It also gives rules for writing and printing these symbols and for the use of additional marks (subscripts, superscripts, etc.) with symbols for quantities.