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Heat loss allowance factor

Factor to allow for heat loss into adjacent components.

Symbol
$\epsilon_k$
Formulae
$\sqrt{1+F_k A_k \sqrt{\frac{t_k}{S_k}}+{F_k}^2 B_k \frac{t_k}{S_k}}$general formula for conductors and spaced wire screens
$\sqrt{1+X_k \sqrt{\frac{t_k}{S_k}}+Y_k \frac{t_k}{S_k}}$simplified formula for conductors and spaced wire screens
$1+0.61M_k \sqrt{t_k}-0.069\left(M_k \sqrt{t_k}\right)^2+0.0043\left(M_k+\sqrt{t_k}\right)^3$formula for screens, sheath and wires
Related
$A_k$
Thermal property constant A [mm/s$^{1/2}$]
$B_k$
Thermal property constant B [mm$^2$/s]
$F_k$
Imperfect contact thermal factor
$M_k$
Thermal contact factor [s$^{1/2}$]
$S_k$
Cross-sectional area of current carrying component [mm$^2$]
$t_k$
Duration of short-circuit [s]
Used in
$I_{k,per}$
Permissible short-circuit current [kA]
$I_{kAD}$
Short-circuit current (adiabatic) [kA]