The standard assumes linear material properties. For high temperatures (e.g., near melting point), errors occur. The standard only applies up to the cable’s rated short-circuit temperature.
IEC 949 provides a simplified formula for calculating the minimum cross-sectional area of a conductor required to withstand a specific fault current. The formula derived from the heat balance equation is:
$$ S = \frac\sqrtI^2 \cdot tK $$
Or, to find the permissible short-circuit current $I$:
$$ I = K \cdot \fracS\sqrtt $$
To perform IEC 949 PDF work, you need to understand the mathematical framework. The standard defines the permissible short-circuit current as:
[ I = \sqrt\frac\epsilon \cdot (A \cdot k)^2t \cdot \left(1 + \lambda \right) ] iec 949 pdf work
Where:
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