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IAD=K⋅St⋅ln(θf+βθi+β)cap I sub cap A cap D end-sub equals the fraction with numerator cap K center dot cap S and denominator the square root of t end-root end-fraction center dot the square root of l n open paren the fraction with numerator theta sub f plus beta and denominator theta sub i plus beta end-fraction close paren end-root : Cross-sectional area ( mm2m m squared : Duration of short circuit (s). : Initial and final temperatures (°C). : Material-specific constants. 🛠️ Material Constants (Constant) (Temp. Constant) Max Temp (XLPE) Aluminum (Al) Reference: 📥 How to Access IEC 60949 Giving up on the "free download" hunt, Marcus