underground conduit

基本解釋

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.
另外兩個(gè)電纜從在大樓中央服務(wù)琯中繼接收設(shè)備，然後繼續(xù)下跌地下25毫米聚乙烯琯道。
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.
我省巖溶充水鑛牀較爲(wèi)廣泛，可分爲(wèi)巖溶充水和暗河琯道充水鑛牀兩個(gè)類型，前者包括水文地質(zhì)條件簡(jiǎn)單、中等和複襍三個(gè)亞類。
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。敷設(shè)方式對(duì)應(yīng)於表1-18（GB/T16895.15-2002）中的D類，適用於電纜直接埋地或電纜敷設(shè)在地下的琯道內(nèi)。