二次线敷设于尺寸宽裕的线槽内，容易接线。
Secondary wire is laid in ample wirecasing , which allows easy wiring.
工程地点内信号室内外电缆及电线路的敷设、防护、接续、引入、引出、配线等。
Inside and outside cable and circuit laying out, guarding, connection, switch-in, leading out and conductor arrangement of internal signal room on construction site.
绝缘线芯分色，为敷设安装提供方便。
Butyl polymer is used as the insuation and coloring for the installing and laying work.
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