Thermal resistance C transient thermal circuit

Element C is only relevant for cables in air. The factor $T_{4iii}$ is the external thermal resistance due to air in the steady-state, calculated according to IEC 60287, expressed as a quantity per conductor or equivalent conductor.

Symbol
$T_{C}$
Unit
K.m/W
Formulas
$\frac{q_{4} T_{4iii}}{n_{c}}$