Types of wiring : Underground Cable wiring

Although overhead transmission lines are used to send current to one place to another, but there's another alternative way to send current without occur any damaged to cables and less likely to happen fault. That's underground cable transmission.

Underground cable transmission work similar way like overhead transmission. It receive current from power plant,send to substation, step voltage and step down voltage again send to large cities. The types of cables are used in this underground cable wiring are armoured cable like Steel Wire Armoured (SWA), Cross-linked polyethylene (XLPE) and so on. These wires are made of layers of insulation with PVC, steel,rubber and more and it's hard to bend.

 

 A simply underground wiring that can easily understand is 'Street Light Underground wiring'

It's easy to understand how to buried cable deep in underground and make connection to feeder pillar and to the street light.

 The picture above shown about the street light underground cable wiring. This wiring is used three phase current,so each phase goes to each street light. the armoured cable is buried underground. Feeder Pillar is a board that contain fuse for connect each wires. This fuse current rate is 100A. So when three phase supply is given to feeder pillar,this current fill flows to the fuse and the wires to light up the street lights.

Underground cables installation is so hard to do and it's require more workers,special tools machines and so on. We will look about this underground cable installation in coming post because there's more steps and procedur to carry on. There's advantage and disdavantage about this underground cable wiring.

Advantage : 

• Safe from lightning strike and other natural disaster from outside
• No pole is require for this underground cable wiring
• No pollution after underground cable installation.

Disadvantage :

• Need more workers and machines
• More cost for this installation
• Hard for additional wiring installtion
• take long time to finish the installation.