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。
Eight of the outgoing cables cross the roof and drop inside conduit in the corners of the tower block.
即将离任的电缆八横屋顶和内部在大楼的角落里，管道下降。
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