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Element C of equivalent 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
Formulae
$\frac{q_4 T_{4iii}}{n_c}$
Related
$n_c$
Number of conductors in object
$q_4$
Ratio of losses affecting environment
$T_{4iii}$
Thermal resistance to ambient [K.m/W]
Used in
$T_B$
Element B of equivalent thermal circuit [K.m/W]