The ambient temperature is the temperature of the surrounding medium under normal conditions, at a situation in which cables are installed, or are to be installed, including the effect of any local source of heat, but not the increase of temperature in the immediate neighbourhood of the cables due to heat arising therefrom.

Symbol
$\theta_{\mathrm{a}}$
Unit
°C
Used in
$\Delta \theta_{\mathrm{0t}}$
$\Delta \theta_{\mathrm{max}}$
$\Delta \theta_{\mathrm{R_{\mathrm{\infty}}}}$
$\Delta \theta_{\mathrm{x}}$
$\mathrm{Gr}_{\mathrm{prot}}$
$h_{\mathrm{rad_{\mathrm{sa}}}}$
$I_{\mathrm{c}}$
$k_{\mathrm{l}}$
$r_{\mathrm{\theta}}$
$T_{\mathrm{conv_{\mathrm{sa}}}}$
$T_{\mathrm{rad_{\mathrm{sa}}}}$
$\theta_{\mathrm{at_{\mathrm{L}}}}$
$\theta_{\mathrm{at_{\mathrm{z}}}}$
$\theta_{\mathrm{c}}$
$\theta_{\mathrm{e}}$
$\theta_{\mathrm{hs}}$
$\theta_{\mathrm{to}}$
$\theta_{\mathrm{to_{\mathrm{z}}}}$
$W_{\mathrm{a_{\mathrm{L}}}}$
$W_{\mathrm{a_{\mathrm{z}}}}$
$W_{\mathrm{conv_{\mathrm{sa}}}}$
$W_{\mathrm{hs}}$
$W_{\mathrm{rad_{\mathrm{sa}}}}$