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IEC STANDARD EXPLAINED AND DISCUSSED

About IEC Standard 
Millions of devices that contain electronics, and use or produce electricity, rely on IEC International Standards and Conformity Assessment Systems to perform, fit and work safely together. Founded in 1906, the IEC (International Electrotechnical Commission) is the world’s leading organization for the preparation and publication of International Standards for all electrical, electronic and related technologies. These are known collectively as “electrotechnology”..continue..




This is an incomplete list of standards published by the International Electrotechnical Commission (IEC). IEC standards may have multiple sub-part documents, only the main title for the standard is listed here:
IEC 60027 Letter symbols to be used in electrical technology...
IEC 60034 Rotating electrical machinery
IEC 60038 IEC Standard Voltages
IEC 60044 Instrument transformers.continue..


Comparison of electrical symbols between ANSI standards and IEC standards.continue..


ALL SYMBOLS MAY BE DRAWN IN ANY POSITION, THE INSCRIPTIONS SHALL REMAIN, HOWEVER IN THE UPRIGHT POSITION. EXCEPTION ARE: A. RELAYS, CONTACTS AND SWITCHES SHALL BE SHOWN SUCH THAT THE MODE OF OPERATION IS FROM LEFT TO RIGHT OR FROM BOTTOM TO TOP. B. INSCRIPTION ON CIRCUIT AND CABLES SHALL BE WRITTEN ALONG THE SYMBOLS AND SHALL BE READ FROM LEFT TO RIGHT OR FROM BOTTOM TO TOP.s.continue..


Where two voltages are given below separated by “/”, the first is the root-mean-square voltage between a phase and the neutral connector, whereas the second is the corresponding root-mean-square voltage between two phases (exception: the category shown below called "One Phase", where 240 V is the root-mean-square voltage between the two legs of a split phase). The three-phase voltages are for use in either four-wire (with neutral) or three-wire (without neutral) systems.continue..
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