The temperature of a power cable is the conductor temperature rise above the ambient temperature plus the
$\theta_a+\Delta \theta_c+\Delta \theta_{sun}$ | Cables in air, in riser IEC 60287 |
$\theta_a+\Delta \theta_c-\left(v_4-1\right) \Delta \theta_x+v_4 \Delta \theta_p$ | Cables buried |
$\theta_{de}+\Delta \theta_c$ | Cables in tunnel |
$\theta_a+\Delta \theta_c+\Delta \theta_{0t}$ | Cables in tunnel (IEC 60287-2-3) |
$\theta_t+\Delta \theta_c$ | Cables in channel (Heinhold) |
$\theta_{at}+\Delta \theta_c$ | Cables in trough |
$\theta_a+\Delta \theta_c+\Delta \theta_p$ | Cables subsea |
$\theta_{air}+\Delta \theta_c$ | Cables in riser |