is a valuable engineering tool for low-voltage switchgear manufacturers and panel builders. It enables a scientifically backed estimation of temperature rise without full-scale testing, provided the application limits are strictly respected. However, it remains an approximation – critical applications or non-compliant enclosures still require actual testing per IEC 61439-1.
The basic formula from IEC TR 60890 is:
A panel builder designing a 1600A main distribution board (MDB) with multiple outgoing sections wants to predict internal temperature rise without building a full prototype. By calculating losses (e.g., 500 W per compartment) and entering enclosure dimensions (H=2000 mm, W=1200 mm, D=600 mm) into the IEC TR 60890 method, they determine the expected internal air temperature rise is 25 K – acceptable for components rated at 40°C ambient. iec tr 60890 pdf
The IEC TR 60890 PDF can be obtained from the International Electrotechnical Commission (IEC) website or through authorized distributors. The standard is available in English and French, with translations in other languages also available.
A: Yes, but you must account for solar radiation as an additional heat source—the TR assumes no external radiation. is a valuable engineering tool for low-voltage switchgear
As of 2025, the working group (IEC/SC 121B) is considering updates to include:
: Avoid free PDF hosting sites claiming to offer the "iec tr 60890 pdf free download." They often distribute old versions (e.g., 1992 or 2005), which do not reflect modern component losses or IP code updates. Using an obsolete standard can lead to non-compliance with IEC 61439. The basic formula from IEC TR 60890 is:
The updated technical report includes several new informative annexes that address real-world variables: application of IEC TR 60890 for medium voltage products
While originally for natural cooling, the new edition provides technical guidance for forced ventilation management .
Before downloading the , understand what the method can and cannot do.