# Temperature rise ratio

Ratio of cable or duct outside surface temperature rise above ambient to the conductor temperature rise above ambient under steady-state conditions.

Symbol
$k_t$
Unit
p.u.
Formulae
$\frac{\theta_{de}-\theta_a}{\theta_c-\theta_a}$
Related
$\theta_a$
$\theta_c$
$\theta_{de}$
Used in
$M_1$