The methodology described in the involves a systematic assessment of heat generation versus dissipation: IEC TR 60890:2022
Addition of equations to complement traditional characteristic curves, making the standard easier to implement in digital calculation tools. The Calculation Procedure iec tr 60890 pdf
Systems without (though the 2022 edition adds guidance for it). The methodology described in the involves a systematic
Evaluating how nearby structures impact the cooling surface area. iec tr 60890 pdf
Assessing additional heat-rise from outdoor exposure.
Technical guidance is now provided for complex real-world scenarios, such as: