Provides specific heat capacities and material densities for copper, aluminum, and various insulations (XLPE, PVC, EPR).
Assumes all heat is trapped inside the conductor because the fault happens too fast to escape.
The standard is a critical document for electrical engineers, system designers, and cable manufacturers. It provides the mathematical framework for calculating the permissible short-circuit currents in electrical components when accounting for non-adiabatic heating effects. iec 949 pdf
Entities like ANSI (USA), BSI (UK), or DIN (Germany) provide localized access to identical adoptions of the document.
Understanding IEC 949: The Standard for Calculating Non-Adiabatic Short-Circuit Heating Effects Provides specific heat capacities and material densities for
is the permissible short-circuit current taking non-adiabatic effects into account. Iadcap I sub a d end-sub
IEC 60949 is titled "Calculation of thermally permissible short-circuit currents, taking into account non-adiabatic heating effects." Published by the International Electrotechnical Commission (IEC), it supplements (short-circuit temperature limits) and coordinates closely with IEC 60909 (short-circuit current calculations). It provides the mathematical framework for calculating the
While I cannot host the file, you can obtain the official standard through these channels:
To perform accurate calculations, the standard defines precise constants for common metals: Conductor Material Coefficient Aluminum (Al) Lead (Pb) Steel Critical Insulation Temperature Limits The initial ( θitheta sub i ) and final ( θftheta sub f
If you are working on a specific cable rating project, let me know:
= The thermally permissible short-circuit current (Non-adiabatic). Iadcap I sub a d end-sub