The validity of the calculation has been extended for currents up to Accessing the Document
To perform the calculation, several critical data points and environmental conditions must be met: Power Loss Data iec tr 60890 pdf
(the third edition), which replaced the 2014 version. If you are looking for the latest technical guidelines, ensure your PDF is the 2022 edition to benefit from: Alignment with IEC 61439-1:2020: The validity of the calculation has been extended