IEC 60027

IEC 60027
Title	IEC 60027
Status	Withdrawn and superseded in parts
Organization	International Electrotechnical Commission
First published	1938
Language	English

IEC 60027 is an international technical standard published by the International Electrotechnical Commission that defined letter symbols, quantities, and units for use in electrical technology and related fields. The standard addressed notation for electrical, electronic, and magnetic quantities and provided standardized prefixes to ensure interoperability among manufacturers, laboratories, and regulatory bodies. It influenced concurrent work by organizations such as the International Organization for Standardization, the Institute of Electrical and Electronics Engineers, and national committees in Germany, United Kingdom, and France.

Scope and Purpose

IEC 60027 specified standardized symbols, units, and prefixes intended to harmonize technical communication among stakeholders including manufacturers like Siemens, General Electric, and Mitsubishi Electric, testing bodies such as Underwriters Laboratories and TÜV Rheinland, and research institutes like the National Physical Laboratory and Physikalisch-Technische Bundesanstalt. The scope covered electrical quantities (voltage, current, resistance), electronic quantities (capacitance, inductance), and related quantities used in standards produced by International Electrotechnical Commission technical committees, national standards bodies such as the American National Standards Institute and the British Standards Institution, and sector regulators such as Federal Communications Commission and Ofcom.

Historical Development and Revisions

The work on standardized electrical notation predated IEC 60027 and involved early twentieth-century laboratories including NIST and Laboratoire national de métrologie et d'essais. The IEC published initial editions in the 1930s and revisions through the twentieth century responding to developments from organizations like Comité Consultatif pour les Étalons de Mesure (CCEM) and events such as the postwar reconstruction period impacting Siemens and AEG. Major revisions reflected coordination with the International System of Units promulgated by the International Bureau of Weights and Measures and harmonization efforts with standards bodies like ISO and IEEE. Later editions were progressively superseded or incorporated into IEC/ISO joint standards, following consultations with committees including IEC Technical Committee 25 and ISO Technical Committee 12.

Structure and Parts

IEC 60027 was organized in multiple parts addressing different domains, mirroring structures used by ISO/IEC joint publications and other multipart standards like ISO 9001 series. Parts covered base symbols, supplementary symbols, and scope-specific notations similar to the way series such as IEC 60417 catalog graphical symbols. The modular layout enabled national committees including Association Française de Normalisation and Deutsches Institut für Normung to adopt relevant parts independently while maintaining consistency with cross-sector standards such as those from CENELEC and ETSI.

Prefixes and Symbols Defined

The standard defined prefixes for multiples and submultiples used in conjunction with SI units, paralleling developments by the International System of Units and recommendations from the Bureau International des Poids et Mesures. Symbols for quantities—used in technical documents issued by Schneider Electric, ABB Group, and laboratories such as Metrology Institute of Japan—were standardized to reduce ambiguity found in earlier national conventions. Definitions addressed prefix usage in contexts similar to those governed by IEEE Standards Association documents and were referenced by regulatory frameworks in jurisdictions like European Union directives and Japanese Industrial Standards.

Adoption and National Implementations

National standards bodies implemented IEC 60027 content through transposition or by integrating parts into domestic standards, a process followed by organizations such as British Standards Institution, Association Française de Normalisation, Deutsches Institut für Normung, and American National Standards Institute. Industry consortia including JEDEC and USB Implementers Forum referenced IEC conventions when specifying signal levels and data-rate notation. Adoption varied by country and sector, with harmonization initiatives at regional bodies like European Committee for Electrotechnical Standardization and coordination with agencies such as National Institute of Standards and Technology influencing national procedures.

Applications and Impact on Industry

IEC 60027 influenced technical documentation, product datasheets, laboratory procedures, and educational materials used by universities such as Massachusetts Institute of Technology and Technical University of Munich. Its standardized symbols reduced misinterpretation in product specifications from companies like Intel, Panasonic, and Sony, and improved interoperability in complex systems developed by Lockheed Martin and Airbus. Metrology laboratories and testing houses used the conventions to maintain traceability to international references such as those maintained by the Bureau International des Poids et Mesures.

Relation to Other Standards

IEC 60027 related closely to the International System of Units, and its provisions were aligned or merged with ISO/IEC joint standards and recommendations from the International Bureau of Weights and Measures. It interfaced with graphical symbol standards such as IEC 60417 and measurement practices codified in documents from IEEE Standards Association, CENELEC, and ISO. Subsequent consolidation efforts led to integration with broader standards frameworks used by multinational manufacturers and testing organizations including Underwriters Laboratories and TÜV SÜD.

Category:International Electrotechnical Commission standards