The current rating of bare conductors is affected by the conductor temperature, weather parameters, heat losses due to convection and radiation, the solar heat gain and conductor resistance, the calculation of which is governed by a steady-state and a non-steady-state heat balance equation.
Power cables are used for both ac and dc high voltage power transmission throughout the world. Technological advances, particularly those relating to jointing, has meant that cables can reliably be utilised at ever-increasing voltages and for a broader range of applications and installation conditions than ever before.
The calculation of current ratings for modern submarine cables is similar to that of land cables, with only a few nuances. Some important differences which affect the current rating lie in the areas the cables construction and installation conditions.