各类导体20℃时直流电阻及温度换算系数（请电缆人收藏备用）
a. 第1种实芯导体20℃导体电阻值：标称截面积/mm220℃时导体直流电阻最大值（Ω/km)圆形退火铜导体铝导体和铝合金导体，圆形或成型不镀金属镀金属0.536.036.7-0.7524.524.8-118.118.2-1.512.112.2-2.57.417.56-44.614.70-63.083.11-101.831.84-161.151.16-因第1种实芯导体日常最多涉及以上规格，故16mm2以上规格不再表述，如有需要可查GB/T3956b.第2种绞合导体最少根数及20℃导体电阻值：标称截面积/mm2导体的最少单线根数20℃时导体最大电阻（Ω/km)圆形紧压圆形成形退火铜导体铝或铝合金导体铜铝铜铝铜铝不镀金属镀金属0.57—————36.036.7—0.757—————24.524.8—1.07—————18.118.2—1.57—6———12.112.2—2.57—6———7.417.56—47—6———4.614.70—67—6———3.083.11—107766——1.831.843.08167766——1.151.161.91257766660.7270.7341.20357766660.5240.5290.86850191966660.3870.3910.641701919121212120.2680.270.443951919151515150.1930.1950.3201203737181518150.1530.1540.2531503737181518150.1240.1260.2061853737303030300.09910.1000.1642403737343434300.07540.07620.1253006161343434300.06010.06070.1004006161535353530.04700.04750.07785006161535353530.03660.03690.06056309191535353530.02830.02860.046980091915353——0.02210.02240.0367100091915353——0.01760.01770.0291c.第5种绞合导体最小单丝直径及20℃导体电阻值：标称截面积/mm2导体内最大单线直径/mm20℃时导体最大电阻（Ω/km)不镀金属单线镀金属单线0.50.2139.040.10.750.2126.026.710.2119.520.01.50.2613.313.72.50.267.988.2140.314.955.0960.313.303.39100.411.911.95160.411.211.24250.410.780.795350.410.5540.565500.410.3860.393700.510.2720.277950.510.2060.211200.510.1610.1641500.510.1290.1321850.510.1060.1082400.510.08010.08173000.510.06410.06544000.510.04860.04955000.610.03840.03916300.610.02870.0292d.第6种绞合导体最小单丝直径及20℃导体电阻值：标称截面积/mm2导体内最大单线直径/mm20℃时导体最大电阻（Ω/km)不镀金属单线镀金属单线0.50.1639.040.10.750.1626.026.710.1619.520.01.50.1613.313.72.50.167.988.2140.164.955.0960.213.303.39100.211.911.95160.211.211.24250.210.780.795350.210.5540.565500.410.3860.393700.410.2720.277950.410.2060.211200.410.1610.1641500.410.1290.1321850.410.1060.1082400.410.08010.08173000.410.06410.0654e.温度换算系数：1212测量时导体温度t/℃校正系数k1对所有导体测量时导体温度t/℃校正系数k1对所有导体01.087210.99611.082220.99221.078230.98831.073240.98441.068250.9851.064260.97761.059270.97371.055280.96981.050290.96591.046300.962101.042310.958111.037320.954121.033330.951131.029340.947141.025350.943151.020360.94161.016370.936171.012380.933181.008390.929191.004400.926201.000
