IAD=K×St×ln(θf+βθi+β)cap I sub cap A cap D end-sub equals the fraction with numerator cap K cross 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 ( mm2m m squared : Duration of short-circuit ( : Material constants (e.g., for Copper). θitheta sub i θftheta sub f : Initial and final allowable temperatures.
If you design a power system based on an illegally downloaded or outdated standard, and a short-circuit causes a fire, the court will not accept "I found it for free online" as a defense. Iec 60949 Free Download Pdf