is a technical report published by the International Electrotechnical Commission (IEC). The current title is “A method of temperature-rise verification of low-voltage switchgear and controlgear assemblies by calculation”. In essence, it is a comprehensive guide that specifies how to calculate the temperature rise of air inside enclosures for low-voltage switchgear, controlgear assemblies, and similar products. It describes a standardized approach to determine the steady-state internal temperature of an enclosure based on the total power loss of its internal components.
Physical testing (as per IEC 61439-1) provides the most accurate results but is expensive and time-consuming. The calculation method of IEC TR 60890 is a cost-effective design tool that provides a reliable estimate. It is used for design verification, while physical testing may still be required for final compliance certification, depending on regulatory demands.
Understanding IEC TR 60890: The Standard for Enclosure Temperature Rise iec tr 60890 pdf
The method accounts for how the enclosure is ventilated. It adjusts parameters based on whether the enclosure is fully sealed (natural cooling), fitted with ventilation louvers, or equipped with forced fan cooling. 4. Height-Dependent Temperature Distribution
Visit the IEC Webstore today, search for "IEC TR 60890:2014+AMD1:2017 CSV," and secure your legitimate copy. Then, download the calculation spreadsheets (available from various third-party engineering sites) to automate the process. Do not rely on free, illegal copies—your career and your clients' safety depend on accuracy and compliance. is a technical report published by the International
Typical test procedures and interpretations
The top of the enclosure (where heat accumulation is highest). Scope and Critical Limitations It describes a standardized approach to determine the
Circuit breakers, contactors, and fuses. Internal conductors: Busbars, cables, and terminal blocks.
Local national standards bodies (e.g., DIN, BSI, ANSI) often sell the English, French, or locally translated versions.