Electrical Cables
The breakdown of insulation of the cable can be avoided economically by the use of

None of the listed here
Inter-sheaths
Insulating materials with different dielectric constants
Both Inter-sheaths and Insulating materials with different dielectric constants

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Electrical Cables
Capacitance grading of cable implies

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

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