NG TGN(T) 067 PDF

This TGN outlines the factors which affect the current ratings of cables and provides tables of continuous and short-term ratings applicable to directly buried cables, cables in troughs and in air and water-cooled cables for particular conditions. An indication of cable sizes required to match the overhead line ratings given in TGN(T)26 is also given. The coverage of cables is generally comprehensive for voltages down to 132 kV while there is no attempt to provide current ratings for cables below 66 kV. This TGN does not include details of the short circuit ratings applicable to cables.