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Iec 60840 Pdf Free 21


IEC 60840: A Standard for Power Cables with Extruded Insulation




Power cables are essential for transmitting electrical energy from generation plants to consumers. However, power cables are also exposed to various environmental and operational stresses, such as high voltage, temperature, humidity, mechanical forces, and chemical agents. Therefore, power cables need to meet certain quality and performance standards to ensure their safety and reliability.


One of the international standards for power cables is IEC 60840, which specifies test methods and requirements for power cable systems, cables alone and accessories alone, for fixed installations and for rated voltages above 30 kV (Um = 36 kV) up to and including 150 kV (Um = 170 kV). The requirements apply to single-core cables and to individually screened three-core cables and to their accessories .


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The latest edition of IEC 60840 was published in May 2020, and it includes the following main changes from the previous edition :



  • the scope has been extended to include cables with extruded insulation and their accessories up to 150 kV (Um = 170 kV);



  • the test methods have been updated to reflect the current state of the art;



  • the requirements have been revised to align with the latest editions of IEC 60228, IEC 60287, IEC 60502-4, and IEC 62067;



  • the annexes have been restructured and supplemented with additional information.




The IEC 60840 standard covers various aspects of power cable systems, such as:



  • conductor examination;



  • measurement of electrical resistance of conductor and metal screen;



  • measurement of thickness of cable insulation and oversheath;



  • measurement of thickness of metal sheath;



  • partial discharge test;



  • dielectric loss factor measurement;



  • lightning impulse test;



  • switching impulse test;



  • AC voltage test;



  • bending test;



  • thermal stability test;



  • short-circuit test;



  • cable accessories tests.




The IEC 60840 standard also provides guidance on the selection of test samples, the frequency and repetition of tests, the acceptance criteria, and the test report .


The IEC 60840 standard is available for purchase from the IEC Webstore . However, some websites may offer a free PDF version of the standard for download. For example, one such website is [this one], which claims to provide a free PDF version of the fifth edition of IEC 60840. However, users should be cautious when downloading files from unverified sources, as they may contain viruses or malware that could harm their devices or compromise their data.


In conclusion, IEC 60840 is an important standard for power cables with extruded insulation and their accessories for rated voltages above 30 kV (Um = 36 kV) up to and including 150 kV (Um = 170 kV). It specifies test methods and requirements for ensuring the quality and performance of power cable systems. The latest edition of IEC 60840 was published in May 2020, and it can be purchased from the IEC Webstore or downloaded from some websites that offer a free PDF version.


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