Is applicable to any type of cable and group running horizontally, provided that the cables are of equal diameter and emit equal losses. This publication supersedes IEC 61042.
IEC 60287-2-2 Ed. 1.0 b:1995
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Electric cables – Calculation of the current rating – Part 2: Thermal resistance – Section 2: A method for calculating reduction factors for groups of cables in free air, protected from solar radiation