The calculation relies on determining the "effective cooling surface" of the enclosure and the total effective power loss of all internal components. Effective Cooling Surface ( Aecap A sub e
The latest version, published in late 2022, introduced several significant technical changes to reflect evolving engineering practices: iec tr 60890 pdf
Imagine a (H=1800mm, W=800mm, D=300mm) containing: The calculation relies on determining the "effective cooling
: It serves as a verification method when laboratory testing is not feasible or required. published in late 2022