Electrical Cables
The insulating material should have

High resistivity
All of the listed here
Low permittivity
High dielectric strength

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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
Use of dielectrics of different permeabilities
Grading according to capacitance of cables per km length
Cables using single dielectric in different concentrations

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