推荐回答（3个）
AWG是美国线规，20AWG的标称截面积0.519，最小值0.509；其中使用多达的单丝可以选择，主要看使用场合，要求柔软的就用细丝，要保证截面积符合美标。
AWG是美制电线标准的简称，AWG值是导线厚度（以英寸计）的函数。换算后的常用AWG和线径值，如下：
#AWG号数，mm直径厘米，圆平方厘米(c/m)
8 3.264 16440
9 2.906 12960
10 2.588 10380
11 2.305 8234
12 2.053 6530
安全载流量
一般铜导线载流量导线的安全载流量是根据所允许的线芯最高温度、冷却条件、敷设条件来确定的。一般铜导线的安全载流量为5~8A/mm²，铝导线的安全载流量为3~5A/mm²。
<关键点>一般铜导线的安全载流量为5~8A/mm²，铝导线的安全载流量为3~5A/mm²。如：2.5mm²BVV铜导线安全载流量的推荐值2.5×8A/mm²=20A，4mm²BVV铜导线安全载流量的推荐值4×8A/mm²=32A。
AWG(American Wire Gauge)是美制电线标准的简称，AWG值是导线厚度（以英寸计）的函数。
换算后的常用AWG和线径值，如下：
#AWG号数 mm直径厘米 圆平方厘米(c/m)
8 3.264 16440
9 2.906 12960
10 2.588 10380
11 2.305 8234
12 2.053 6530
14 1.628 4110
15 1.450 3257
16 1.291 2580
17 1.150 2048
18 1.024 1620
19 0.9116 1288
21 0.7229 810
22 0.6438 645
23 0.5733 509.4
24 0.5106 405
33 0.1798 50.13
电线是银色那是表面镀锡的铜芯线
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