2nd Edition, April 1, 2015
Electric cables – Calculation of the current rating – Part 2-1: Thermal resistance – Calculation of thermal resistance
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Description / Abstract:
This part of IEC 60287 is solely applicable to the conditions of
steady-state operation of cables at all alternating voltages, and
direct voltages up to 5 kV, buried directly in the ground, in
ducts, in troughs or in steel pipes, both with and without partial
drying-out of the soil, as well as cables in air. The term "steady
state" is intended to mean a continuous constant current (100 %
load factor) just sufficient to produce asymptotically the maximum
conductor temperature, the surrounding ambient conditions being