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Underground cables are laid at sufficient depth

  By GK Planet Team      
Q. Underground cables are laid at sufficient depth
  1. To minimize temperature stresses
  2. To avoid being unearthed easily due to the removal of soil
  3. To minimize the effect of shocks and vibrations due to gassing vehicles, etc.
  4. For all of the above reasons
Answer: To minimize the effect of shocks and vibrations due to gassing vehicles, etc.

Underground cables are laid at sufficient depth to minimize the effect of shocks and vibrations due to gassing vehicles, etc.
An underground cable is a cable that is buried below the ground. They distribute electrical power or telecommunications. Such cables are an alternative to overhead cables, which are several meters above the ground. Overhead cables are often replaced with underground cables. Downtown areas with many tall buildings usually have few or no cables above ground, This is mainly for aesthetic purposes because underground cables can not be seen. They are also less dangerous to people because they are out of the way. They cost more to install, but last longer.

According to the Energy Networks Association (ENA) guidelines, an exclusion zone should be established around the cables as follows:
  • low voltage line — 1m
  • 11kV and 33kV lines — 3m
  • 132kV lines — 6m
  • 275kV lines — 7m.
Under no circumstances must any part of plant or equipment be allowed to encroach the exclusion zone.
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