Some manufacturer websites (Prysmian, Nexans, Southwire) offer free non-adiabatic calculation tools. However, verify they follow IEC 60949 explicitly.
The non-adiabatic method assumes the conductor starts at its rated operating temperature (e.g., 90°C for XLPE). If the cable was pre-loaded at 105% before the fault, recalculate.
The base formula used within the standard for adiabatic conditions is:
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