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
$\frac{- \theta_{a} + \theta_{de}}{- \theta_{a} + \theta_{c}}$
Related
$\theta_{a}$
Ambient temperature [$^{\circ}$C]
$\theta_{c}$
$\theta_{de}$