线缆选取步骤

1、线缆选取一、一般铜线安全计算方法为：2.5平方毫米铜电源线的安全载流量-28A4平方毫米铜电源线的安全载流量-35A ；6平方米铜电源线的安全载流量-48A10平方毫米铜电源线的安全载流量-65A16平方毫米铜电源线的安全载流量-91A25平方毫米铜电源线的安全载流量-120A二、估算口诀：二点五下乘以九，往上减一顺号走。(我们常用)三十五乘三点五，双双成组减点五。条件有变加折算，高温九折铜升级。(我们常用)穿管根数二三四，八七六折满载流。“二点五下乘以九，往上减一顺号走”是2.5平方及以下的各种截面 铝芯绝缘线，其载流量约为截面数的9倍。如2.5导线，载流量为2.5 X9 = 22.5(A)

2、从4平方及以上导线的载流量和截面数的倍数关系是 顺着线号往上排，倍数逐次减1即4x8、6x7、10 x6、16x5、25 x4o三、选取步骤1、根据电流值计算横截面积(1)铝线：铝线安全载流量为3-5倍的横截面积。eg:所需电流为3.7A则线缆应能承受3S-5S大小的电流，按最大电流计算：线缆应承受5*S*90%=3.7A，则S=0.82mm 2。(2)铜线：铜线安全载流量为5-8倍的横截面积。eg：所需电流为3.7A则线缆应能承受5S-8S大小的电流，按最大电流 计算：线缆应承受5*S=3.7A则S=0.74mm2。由于条件有变加折算， 高温九折铜升级。我们可选取下表中小一级的横截面积，即

3、0.5667mm 22、更具横截面积对照线号表选取线缆外径截面积 (mm2)电阻值 (/km)AWG夕卜径截面积 (mm2)电阻值 (/km)AWG公制mm英制inch英制inch4/011.680.46107.220.17220.6430.02530.324754.33/010.400.409685.010.21230.5740.02260.258848.52/09.270.364867.430.26240.5110.02010.204789.41/08.250.324953.490.33250.440.01790.162479.617.350.289342.410.42260.4040.0

4、1590.128114326.540.257633.620.53270.3610.01420.102112835.830.229426.670.66280.320.01260.080422745.190.204321.150.84290.2870.01130.064728954.620.181916.771.06300.2540.01000.050736164.110.162013.301.33310.2260.00890.040132173.670.144310.551.68320.2030.00800.031658383.260.12858.372.11330.180.00710.0255

5、94492.910.11446.632.67340.160.00630.0201956102.590.10195.263.36350.1420.00560.01691,200112.300.09074.174.24360.1270.00500.01271,530122.050.08083.3325.31370.1140.00450.00981,377131.820.07202.6276.69380.1020.00400.00812,400141.630.06412.0758.45390.0890.00350.00622,100151.450.05711.64610.6400.0790.00310.00494,080161.290.05081.31813.5410.0710.00280.00403,685171.150.04531.02616.3420.0640.00250.00326,300181.020.04030.810721.4430.0560.00220.00255,544190.9120.03590.566726.9440.0510.00200.002010,200200.8130.03200.518933.9450.0460.00180.00169,180