# Temperature of sheath

The formulae to calculate the loss factor for sheath $\lambda_1$ use the resistance of the sheath $R_{sh}$ at its maximum operating temperature. Because the temperature of the sheath is a function of the current, $I_c$, an iterative method is used for the calculation.

With crossing heat sources, a temperature rise of $\Delta\theta_{0x}$ applies at the hottest point.

Symbol
$\theta_{sh}$
Unit
°C
Formulae
$\theta_c-T_1 \left(W_c+\frac{W_d}{2}\right)$
Related
$\Delta \theta_{0x}$
$T_1$
$\theta_c$
$W_c$
Used in
$R_{sh}$