導(dǎo)體標(biāo)秤截面2導(dǎo)體中單線最大直線mm覆蓋層總厚度規(guī)定值mm復(fù)合覆蓋層中的護(hù)套厚度規(guī)定值mm平均外徑20℃時(shí)導(dǎo)體最大電阻20℃下限mm上限mm鍍錫單線Ω/km未鍍錫單線Ω/km160.212.01.39.211.51.191.16250.212.01.310.513.00.7800.758350.212.01.311.514.50.5520.536500.212.21.513.517.00.3900.379700.212.41.615.519.50.2760.268950.212.61.718.022.00.2040.198