IEC 60949:1988 is the definitive international standard for calculating thermally permissible short-circuit currents in electrical cables. While many users search for an "IEC 60949 PDF free download," it is important to note that official copies are typically paid documents available through authorized distributors. What is IEC 60949?
): Determine a factor that accounts for the cooling effect of adjacent materials.
The permissible short-circuit current is the product of the adiabatic current and the modifying factor. Core Formula (Adiabatic)
The standard uses a specific formula to find the adiabatic current based on material properties:
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