大家好！请教大家一个问题，18AWG  束绞导体41/0.16裸铜丝 ，请问这个结构导体算什么类别？是B类、C类、D类或者其他类，导体电阻标准是多少？请问在哪里可以找到这个标准？谢谢！

hekejiu:

UL1581中的表30

您好！这个30.1指的是无镀层实心导体的最大直流电阻，我想知道我这个结构的导体类别和最大直流电阻，谢谢！

以构造论 美规18AWG构造41/0.16 在ASTM B174里 是Class M

束绞导体ASTM B174

Class I: Cords and cables composed of No. 24 AWG (0.511mm)copper wires. Stationary service.

Class J: Cords and cables composed of No. 28 AWG (0.320mm)copper wires. Stationary service.

Class K: Cords and cables composed of No. 30 AWG (0.254mm)copper wires. Stationary service.

Class L: Cords and cables composed of No. 32 AWG (0.203mm)copper wires. Stationary service.

Class M: Cords and cables composed of No. 34 AWG (0.160mm)copper wires. Stationary service.

Class O: Cords and cables composed of No. 36 AWG (0.127mm)copper wires. Stationary service.

Class P: Cords and cables composed of No. 38 AWG (0.102mm)copper wires. Stationary service.

Class Q: Cords and cables composed of No. 40 AWG (0.079mm)copper wires. Stationary service.

绞合裸铜导体  看UL1581 table 30.3