underground conduit

基本解释

Two other cables from the receiving equipment drop in trunking in the central service duct of the tower block and then continue underground in 25 mm polythene conduit.
另外两个电缆从在大楼中央服务管中继接收设备，然后继续下跌地下25毫米聚乙烯管道。
The karst water-filling mines in Hunan province occur widely, which can be divided into two types. that is, karst water-filling mine and underground river conduit water-filling mine.
我省岩溶充水矿床较为广泛，可分为岩溶充水和暗河管道充水矿床两个类型，前者包括水文地质条件简单、中等和复杂三个亚类。
Note: 1. The laying method in correspondence with D category in the table 1-18(GB/T16895.15-2002), which is suitable for the direct cable burying or cable layout in the underground conduit.
注： 1。敷设方式对应于表1-18（GB/T16895.15-2002）中的D类，适用于电缆直接埋地或电缆敷设在地下的管道内。