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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 cross 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 of the conductor ( m m squared : Duration of short circuit (seconds) : Initial and final (permissible) temperatures ( raised to the composed with power C www.cabledatasheet.com : Material-specific constants (Constant) (Temp. Coeff. Reciprocal) Max Temp ( theta sub f 250°C (XLPE) / 160°C (PVC) 250°C (XLPE) / 160°C (PVC) 200°C - 210°C Varies by type 3. Non-Adiabatic Effects

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I=k⋅Atcap I equals the fraction with numerator k center dot cap A and denominator the square root of t end-root end-fraction Where: = Short-circuit current (Amperes) = Cross-sectional area of the conductor ( mm2m m squared ) = Duration of the short-circuit (seconds) cap I sub cap A cap D end-sub

Sites like Cable Data Sheet provide comprehensive breakdowns of the equations and material constants. Non-Adiabatic Effects Official copies of IEC standards are

The base formula for calculating short-circuit current carrying capability is: