The IEC 949 PDF provides formulas and factors (such as the ε factor) to adjust short-circuit current ratings based on real heat dissipation. This allows engineers to use slightly smaller, more cost-effective cables without sacrificing safety, provided the fault duration is long enough for heat to leave the conductor.
Here is what you need to know before you download the wrong file.
To perform the calculation, you need the following data:
Where:
For the first time, there was a global dictionary for HVDC engineers.
You require this specific standard if you are:
The core feature for any IEC 949/60949 PDF tool is the calculation of the permissible short-circuit current using the formula
$$I_permissible = I_AD \times \epsilon$$