# Apparent thermal resistance a

This is the apparent thermal resistance $T_{a0}$ used to calculate cable partial transient temperature rise acc. to IEC 60853-2.

Symbol
$T_{a0}$
Unit
K.m/W
Formulae
$\frac{- b_{0} \left(T_{A} + T_{B}\right) + \frac{1}{Q_{A}}}{a_{0} - b_{0}}$
Related
$a_{0}$
$b_{0}$
$Q_{A}$
$T_{A}$
$T_{B}$
$\Delta \theta_{c_{t}}$
$T_{b0}$