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

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

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Electrical Cables
Capacitance grading of cable implies

Use of dielectrics of different permeabilities
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

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