令狐采学在以太网和xDSL接入网设计中,经常会碰到诸如24AWG、26AWG等等表示电缆直径的方法。其实AWG(AmericanWireGauge)是美制电线
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的简称,AWG值是导线厚度(以英寸计)的函数。下表是AWG与公制、英制单位的对照表。其中,4/0表示0000,3/0表示000,2/0表示00,1/0表示0。例如,常用的电话线直径为26AWG,约为0.4mm。AWG外径截面积(mm2)电阻值(/km)AWG外径截面积(mm2)电阻值(/km)公制mm英制inch公制mm英制inch11.680.46107.220.170.6430.02530.324754.310.400.409685.010.210.5740.02260.258848.59.270.364867.430.260.5110.02010.204789.48.250.324953.490.330.440.01790.162479.67.350.289342.410.420.4040.01590.12811436.540.257633.620.530.3610.01420.10211285.830.229426.670.660.320.01260.08042275.190.204321.150.840.2870.01130.06472894.620.181916.771.060.2540.01000.05073614.110.162013.301.330.2260.00890.04013213.670.144310.551.680.2030.00800.03165833.260.12858.372.110.180.00710.02559442.910.11446.632.670.160.00630.02019562.590.10195.263.360.1420.00560.01691,2002.300.09074.174.240.1270.00500.01271,5302.050.08083.3325.310.1140.00450.00981,3771.820.07202.6276.690.1020.00400.00812,4001.630.06412.0758.450.0890.00350.00622,1001.450.05711.64610.60.0790.00310.00494,0801.290.05081.31813.50.0710.00280.00403,6851.150.04531.02616.30.0640.00250.00326,3001.020.04030.810721.40.0560.00220.00255,5440.9120.03590.566726.90.0510.00200.002010,2000.8130.03200.518933.90.0460.00180.00169,1800.7240.02850.411642.70.0410.00160.001316,300