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What is IEC 60085?


IEC 60085, also known as "Electrical Insulation for Rotating Machines" is an international standard that provides guidelines and requirements for the electrical insulation used in rotating machines such as motors, generators, and transformers. It plays a crucial role in ensuring the safety and efficiency of these machines.

Key Features of IEC 60085

IEC 60085 covers various aspects related to electrical insulation, including material selection, insulation system design, and testing methods. One of its key features is the classification of insulation classes based on temperature tolerance, which helps manufacturers match the insulation with the specific requirements of different applications.

The standard also provides detailed guidelines for insulation coordination, which ensures compatibility between different insulation systems used in rotating machines. It addresses factors such as impulse voltage withstand capabilities, overvoltage protection, and coordination with other protective devices.

Benefits and Importance of IEC 60085

Adhering to IEC 60085 offers several benefits for both manufacturers and end-users. Firstly, it ensures the safety of personnel by providing guidelines for insulation materials that are resistant to electrical hazards. This reduces the risk of electric shock or fire accidents caused by insulation failure.

Secondly, implementing this standard enhances the reliability and durability of the rotating machines. By using the appropriate insulation class, manufacturers can improve the thermal performance of the machines, leading to higher efficiency and reduced energy consumption.

Furthermore, compliance with IEC 60085 helps manufacturers meet international quality standards. It provides them with a framework for consistent product evaluation and certification. End-users can have confidence in the quality and performance of the machines they purchase, as they comply with internationally recognized standards.


In conclusion, IEC 60085 is a vital standard that ensures the electrical insulation used in rotating machines meets specific requirements for safety, efficiency, and reliability. By providing guidelines for material selection, insulation system design, and testing methods, it safeguards against electrical hazards and improves the overall performance of these machines.

Manufacturers and end-users alike benefit from adhering to this standard, as it provides a clear framework for product evaluation, certification, and international quality compliance. Embracing IEC 60085 contributes to a safer and more efficient electrical industry.


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