In order to trace the history of underground cablesystems, it is necessary to examine the early days of the telegraph [1,2]. Thetelegraph was the first device utilizing electrical energy to become of anycommercial importance and its development necessarily required the use ofunderground construction. Accordingly, experimentation with underground cableswas carried on contemporaneously with the development of the apparatus forsending and receiving signals. Underground construction was planned for most ofthe earliest commercial lines. A number of these early installations are ofconsiderable interest as marking steps in the development of the extensiveunderground power systems in operation around the world.

［appleseden 在 2016-10-30 23:29:24 编辑过］

为了追溯地下电缆系统的历史，很有必要去回顾电报的早期发展。电报是第一个把电能商业化的设备，同时地下电缆成为了电报发展中的必要环节。因此，伴随着发送和接收装置的发展，地下电缆的实验也在同步进行着。很多早期的商业线路，基本都是以地下的方式设计的。这些商业线路，标志着在世界各地，地下电缆都得到了广泛的应用。