The temperature of a power cable is the conductor temperature rise above the ambient temperature added to the ambient temperaure plus the

• temperature rise by solar radiation for cables in air
• temperature rise by other buried cables for buried cables
• critical soil temperature rise for buried cables where drying out of soil can occur
• temperature rise of the conductor(s) of the rated cable, due to crossing heat sources, at the hottest point in the cable route.

Symbol
$\theta_{\mathrm{c}}$
Unit
°C
Formulae
 $\Delta \theta_{\mathrm{c}} + \Delta \theta_{\mathrm{sun}} + \theta_{\mathrm{a}}$ cables in air $\Delta \theta_{\mathrm{c}} + \Delta \theta_{\mathrm{p}} - \Delta \theta_{\mathrm{x}} \left(v_{\mathrm{4}} - 1\right) + \theta_{\mathrm{a}}$ cables buried $\Delta \theta_{\mathrm{c}} + \Delta \theta_{\mathrm{p}} + \theta_{\mathrm{a}}$ cables buried where drying-out of soil is avoided $\Delta \theta_{\mathrm{c}} + \theta_{\mathrm{de}}$ cables in tunnel $\Delta \theta_{\mathrm{c}} + \theta_{\mathrm{a}}$ cables in tunnel (IEC 60287-2-3) $\Delta \theta_{\mathrm{c}} + \theta_{\mathrm{at}}$ cables in trough $\Delta \theta_{\mathrm{c}} + \theta_{\mathrm{air}}$ cables in trough (Anders et al 2010) $\Delta \theta_{\mathrm{0x}} + \theta_{c isolated}$ cables crossing external heat sources
Related
$\Delta \theta_{\mathrm{0x}}$
$\Delta \theta_{\mathrm{c}}$
$\Delta \theta_{\mathrm{p}}$
$\Delta \theta_{\mathrm{sun}}$
$\Delta \theta_{\mathrm{x}}$
$\theta_{\mathrm{a}}$
$\theta_{\mathrm{air}}$
$\theta_{\mathrm{at}}$
$\theta_{\mathrm{de}}$
$v_{\mathrm{4}}$
Used in
$\Delta \theta_{\mathrm{a_{\mathrm{t}}}}$
$\delta \theta_{\mathrm{c}}$
$\Delta \theta_{\mathrm{c}}$
$\Delta \theta_{\mathrm{gas}}$
$\Delta \theta_{\mathrm{t_{\mathrm{\infty}}}}$
$\mathrm{Gr}_{\mathrm{c}}$
$h_{\mathrm{rad_{\mathrm{ce}}}}$
$I_{\mathrm{c}}$
$k_{\mathrm{l}}$
$R_{\mathrm{c}}$
$T_{\mathrm{conv_{\mathrm{ce}}}}$
$T_{\mathrm{rad_{\mathrm{ce}}}}$
$\theta_{\mathrm{ar_{\mathrm{1}}}}$
$\theta_{\mathrm{ar_{\mathrm{2}}}}$
$\theta_{\mathrm{c_{\mathrm{t}}}}$
$\theta_{\mathrm{e}}$
$\theta_{\mathrm{encl}}$
$\theta_{\mathrm{f}}$
$\theta_{\mathrm{gas}}$
$\theta_{\mathrm{s}}$
$\theta_{\mathrm{sc}}$
$\theta_{\mathrm{sh}}$
$W_{\mathrm{conv_{\mathrm{ce}}}}$
$W_{\mathrm{rad_{\mathrm{ce}}}}$