Electrical Cables
Underground cables are laid at sufficient depth

To minimize the effect of shocks and vibrations due to gassing vehicles, etc.
All of the listed here
To avoid being unearthed easily due to removal of soil
To minimize temperature stresses

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Electrical Cables
Capacitance grading of cable implies

Grading according to capacitance of cables per km length
Capacitance required to be introduced at different lengths to counter the effect of inductance
Use of dielectrics of different permeabilities
Cables using single dielectric in different concentrations

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