Forming cable : three main core and one grounding wire intertwist encircling core in right direction 成缆： 3个主线芯和一个地线围绕垫芯按右向绞合成缆。
2.
Forming cable : main wire core grounding wire control wire intertwist encircling rubber core . sheath : adopt rubber of type xh03a in gb7594 . 287 成缆：按右向绞合成缆，无控制单元的中心加填芯。
3.
Forming cable : six main wire core which divided into two groups according its color and one control unit intertwist encircling core in right direction 个主线芯按红绿白分成二组与一个控制单元围绕地线按右向绞合成缆。
