): The surface area of the enclosure that contributes to heat dissipation, accounting for mounting types (wall-mounted, floor-standing, etc.).
The full title of the standard is "A method of temperature-rise verification of low-voltage switchgear and controlgear assemblies by calculation". Its primary purpose is to determine how much the air temperature inside an enclosure will rise above the ambient temperature due to the power losses of the equipment installed within it. The standard is especially critical for: Enclosed Assemblies:
Yes, the method is generally applicable to standard materials like sheet steel, aluminum, and insulating materials. However, the 2022 edition includes a new annex specifically addressing the effect of different enclosure materials on thermal performance.
IEC TR 60890 is a Technical Report titled "A method of temperature-rise assessment by extrapolation for partially type-tested assemblies (PTTA) of low-voltage switchgear and controlgear." iec tr 60890 pdf
Generally applied to assemblies with a rated current not exceeding 1600 A.
is a Technical Report that provides a standardized method for verifying the temperature rise of air inside low-voltage switchgear and controlgear assemblies through calculation rather than physical testing. This method is a key alternative for design verification under the broader IEC 61439 series. 1. Scope and Core Purpose
Algorithm developers need the PDF text to program automated thermal design software. Important Notice on Availability ): The surface area of the enclosure that
The official IEC TR 60890 document is copyrighted by the International Electrotechnical Commission. Authorized distributors sell the legitimate PDF version. Downloading unauthorized or free pirated PDFs can lead to using outdated revisions, which compromises engineering accuracy and safety. Proactive Steps for Design Verification
Whether the enclosure is totally enclosed (natural cooling through the walls) or ventilated (natural convection through air vents). 3. Calculating Temperature Rise at Different Heights
: Reduces the need for expensive and time-consuming laboratory temperature-rise tests. is a Technical Report that provides a standardized
The temperature rise ΔT at a specified point inside the enclosure is estimated using:
This article explains the purpose, methodology, and practical applications of IEC TR 60890. It also outlines why professionals look for the PDF version of this technical report. What is IEC TR 60890?
It outlines how to calculate air temperature rise inside enclosures or partitioned sections for assemblies typically without forced ventilation.