Cableizer ®

Factor $h$ emergency overload

This factor $h_{em}$ is used to calculate $I_{c_{em}}$.

It is the factor between the constant current applied to the cable prior to the emergency loading $I_{ss}$ (= $I_c$) to the sustained (100% load factor) rated current $I_R$ for the conductor to attain, but not exceed, the standard maximum permissible temperature $\theta_{max}$.

Symbol
$h_{1R}$
Formulas
$\frac{I_{c,1}}{I_R}$
Related
$I_{c,1}$
Steady-state current before transient [A]
$I_R$
Max permissible steady-state conductor current [A]
$\theta_{max}$
Highest temperature of conductor over a load variation period [°C]
Used in
$I_{c,2}$
Emergency overload current [A]