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IEC 60949
The standard (originally published as IEC 949) defines the methodology for calculating thermally permissible short-circuit currents for electrical cables and conductors . It is primarily used to ensure cable sizing can withstand the heat generated during a fault without damaging the insulation. Standard Overview
Why the exact number matters
If $I_permissible > I_system_fault$, the cable is safe. iec 949 pdf
- IEC 60287: Electric cables – Calculation of the current rating.
- IEC 60865: Short-circuit currents – Calculation of effects.
- IEEE 242 (Buff Book): Protection and coordination.
