Cable crossings - Derating considerations part II - Example of derivation of derating curves

Cables crossing other heat sources either perpendicularly or at oblique angles will experience a rise in conductor temperature which should result in ampacity derating. In the first part of the paper a mathematical model for calculation of derating factors was presented, In this paper, a practical numerical example is considered with a pipe-type cable crossing a 10 kV distribution circuit. The numerical analysis presented here confirms experimental findings reported in the literature that the cable crossing may elevate are conductor temperature by as much as 20 degrees C.