Cableizer ®

Heat loss allowance factor

Factor to allow for heat loss into adjacent components.

Symbol
$\epsilon_{k}$
Formulas
$\sqrt{1+F_{k} A_{k} \sqrt{\frac{t_{k}}{S_{k}}}+{F_{k}}^2 B_{k} \frac{t_{k}}{S_{k}}}$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 metallic component [mm$^2$]
$t_{k}$
Duration of short-circuit [s]
Used in
$I_{k,per}$
Short-circuit current, permissible [kA]
$I_{kAD}$
Short-circuit current, adiabatic [kA]