1、 黑色
装置和设备的内部布线。
2 、棕色
直流电路的正极。
3 、红色
三相电路和C相;
半导体三极管的集电极;
半导体二极管、整流二极管或可控硅管的阴极。
4、黄色
三相电路的A相;
半导体三极管的基极;
可控硅管和双向可控硅管的控制极。
5、绿色
三相电路的B相。
6、蓝色
直流电路的负极;
半导体三极管的发射极;
半导体二极管、整流二极管或可控硅管的阳极。
7、淡蓝色
三相电路的零线或中性线;
直流电路的接地中线。
8、白色
双向可控硅管的主电极;
无指定用色的半导体电路。
9、黄和绿双色(每种色宽约15~100毫米交替贴接)
安全用的接地线。
10 、红、黑色并行
用双芯导线或双根绞线连接的交流电路。
依电路选择导线颜色时
1、交流三相电路的
A相：黄色;
B相：绿色;
C相：红色;
零线或中性线：淡蓝色;
安全用的接地线：黄和绿双色。
2、用双芯导线或双根绞线连接的交流电路：
红黑色并行。
3、直流电路：
正极：棕色;
负极：蓝色;
接地中线：淡蓝色。
4、半导体电路的半导体三极管的集电极：红色;基极： 黄色;发射极：蓝色。
半导体二极管和整流二极管的阳极：蓝色;
阴极：红色。
可控硅管的阳极：蓝色;
控制极：黄色;
阴极：红色。
双向可控硅管的控制极：黄色;
主电极：白色。
5、整个装置及设备的内部布线一般推荐：黑色;半导体电路：白色;有混淆时：容许选指定用色外的其它颜色(如：橙、紫、灰、绿蓝、玫瑰红等)。
6、具体标色时，在一根导线上，如遇有两种或两种以上的可标色，视该电路的特定情况，依电路中需要表示的某种含义进行定色。
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