Thermal resistance part 3

Symbol
$R_{c3}$
Unit
K.m/W
Formulas
$T_{j}$single-core cables, without armour
$T_{ab}$single-core cables, with armour
$T_{f}+T_{ab}+T_{j}$three-core cables, without armour
$T_{f}+T_{ab}$three-core cables, with armour