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

Cables crossing other heat sources either perpendicularly or at oblique ang les 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 n umerical example is considered with a pipe-type cable crossing a 10 kV dist ribution circuit. The numerical analysis presented here confirms experiment al findings reported in the literature that the cable crossing may elevate are conductor temperature by as much as 20 degrees C.