Why underground cables are used?
Underground cables are used for power applications where it is impractical, difficult, or dangerous to use the overhead lines.
They are widely used in densely populated urban areas, in factories, and even to supply power from the overhead posts to the consumer premises..
What size wire do I need for a 200 amp underground service?
GROUNDING ELECTRODE CONDUCTOR SIZING (Table 250.66)Size of Main PanelCopper ConductorsAluminum or Copper-Clad Aluminum125 Amps#8 AWG#6 AWG150 Amps#6 AWG#4 AWG200 Amps#4 AWG#2 AWG1 more row
What is the main disadvantage of underground cables?
High installation cost. Difficult to repair. Difficulty in finding the actual location of underground buried cables. Unwanted digging can cause environmental pollution.
What is underground cable called?
From Wikipedia, the free encyclopedia. Undergrounding is the replacement of overhead cables providing electrical power or telecommunications, with underground cables.
What is underground cable system?
Underground cables essentially consist of a conductor, an insulating system, a wire screen and a sheath. … The conductor is enclosed by an insulating system (dielectric) whose main component is made of plastic, for example. An outer copper wire screen discharges fault currents and keeps the electric field in the cable.
What are the types of underground cables?
What are the Types of Underground Cables?Low-tension cables – maximum capacity of 1000 V (1KV). … High-tension cables – maximum of 11KV. … Super-tension cables – rating of between 22 KV and 33 KV. … Extra high-tension cables – rating of between 33 KV and 66 KV.More items…•