GOST R IEC 60287-2-2-2009 电缆.额定电流的计算.第2-2部分:热变电阻.自由大气,无太阳辐射的电缆组的折减系数测算方法
Electric cables. Calculation of the current rating. Part 2-2. Thermal resistance. A method for calculating reduction factors for groups of cables in free air, protected from solar radiation