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1、Table8MaximumCableLength(m)forGaugeofWireandSpeakerImpedanceGaugeAreamm22Ohm4Ohm8ohm16ohm105.26183672144123.3111234590142.088153060161.3159183618.8236122420.5224816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)是美制电线标准的简称，AWG值是导线厚度(以英寸计)的函数。下表是AWG
2、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,I/O表示0。例如，常用的电话线直径为26AWG,约为0.4mmcAWG外径截面积电阻值AWG外径截面积电阻值
3、公制
4、mmI英制
5、inchI(mm2)(Q/km)
6、公制
7、mmI英制
8、inchI(mm2)(Q/km)4/011.680.46107.220.17220.6430.02530.324754.33/010.400.409685.010.21230.5740.02260.258848.52/09.270.364867.430.26240.511
9、0.02010.204789.41/08.250.324953.490.33250.440.01790.162479.617.350.289342.410.42260.4040.01590.128114326.540.257633.620.53270.3610.01420.102112835.830.229426.670.66280.320.01260.080422745.190.204321.150.84290.2870.01130.064728954.620.181916.771.06300.2540.01000.05073616
10、4.110.162013.301.33310.2260.00890.040132173.670.144310.551.68320.2030.00800.031658383.260.12858.372.11330.180.00710.025594492.910.11446.632.67340.160.00630.0201956102.590.10195.263.36350.1420.00560.01691,200112.300.09074.174.24360.1270.00500.01271,530122.050.08083.3325.
11、31370.1140.00450.00981,377131.820.07202.6276.69380.1020.00400.00812,400141.630.06412.0758.45390.0890.00350.00622,100151.450.05711.64610.6400.0790.00310.00494,080161.290.05081.31813.5410.0710.00280.00403,685171.150.04531.02616.3420.0640.00250.00326,300181.020.04030.81072
12、1.4430.0560.00220.00255,544190.9120.03590.566726.9440.0510.00200.002010,200200.8130.03200.518933.9450.0460.00180.00169,180210.7240.02850.411642.7460.0410.00160.001316,300山表中归纳出的AWG与英寸的关系如下:AWG=Alginch・B其中，A=-19.93156857,B=9・73724°外径总面积电阻值正常电流最大电涼公制mm英制inch(mm2)(Q/km)(A)
13、(A)11.680.46107.220.17423.2482.6I10.40.409685.010.21335.5382.69270.364867.43026266.2303.58.250.324953.490.33211.1240.77.350.289342.410.42167.4190.96540.257633.620.53132.7151.35.830.229426,670.66105.2120.05.190.204321.150.8483.595.24.620.181916.771.0666.275.54.11Cl16213.
14、31.3352.559.93.670.144310.561.6841.647.53.260.12853.372.1133.037.72.910.11446.632.6726.229.82.590.10195.263.36
