Engineers performing "IEC 949 work" typically follow this workflow:
): Specific to the conductor material (e.g., copper or aluminum). Initial operating temperature ( θitheta sub i ) and maximum final permissible temperature ( θftheta sub f Physical Dimensions: Cross-sectional area ( ) of the conductor or metallic screen. Duration: The time ( iec 949 pdf work
$$ (I^2t) device < (I^2t) cable $$
cap I equals the fraction with numerator k cross cap S and denominator the square root of t end-root end-fraction : Cross-sectional area of the conductor in m m squared : Duration of the short-circuit (usually max 5 seconds). Engineers performing "IEC 949 work" typically follow this