The primary goal of IEC 949 is to provide engineers with a unified method to ensure that cable conductors, screens, and sheaths can survive a short circuit without exceeding safe thermal limits. This calculation is essential for:
Meeting international best practices for electrical installations. iec 949 pdf
The standard breaks down the calculation into two distinct stages: 1. The Adiabatic Basis The primary goal of IEC 949 is to
Avoiding oversized cables by using more accurate "non-adiabatic" calculation methods when appropriate. The Calculation Methodology iec 949 pdf
The standard (now officially designated as IEC 60949 ) is the international benchmark for calculating the thermally permissible short-circuit currents for electrical cables.