Electrical Cables
The inter sheaths in the cables are used to

Provide proper stress distribution
Avoid the requirement of good insulation
Minimize the stress
None of the listed here

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Electrical Cables
Capacitance grading of cable implies

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

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