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An specific use of cable - Aerial cable ChangGuang

An aerial cable or air cable is an insulated cable usually containing all conductors required for an electrical transmission system or a telecommunication line, which is suspended between utility poles or electricity pylons. As aerial cables are completely insulated there is no danger of electric shock when touching them and there is no requirement for mounting them with insulators on pylons and poles. A further advantage is they require less right of way than overhead lines for the same reason. They can be designed as shielded cables for telecommunication purposes. If the cable falls, it may still operate if its insulation is not damaged.
 

As aerial cables are installed on pylons or poles, they may be cheaper to install than underground cables, as no work for digging is required, which can be very expensive in rocky areas.

For reasons of electromagnetic interference aerial cables running along power lines are most often of fibre optic types. As these are dielectric, it is even possible to install them directly in the conductors—see optical ground wire.
 

Aerial cables are also used sometimes for power transmission from the transmitter building to the antenna at radio stations.