Electrical Cables
The insulating material for cables should

All of the listed here
Be acid proof
Be non-hygroscopic
Be non-inflammable

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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
Use of dielectrics of different permeabilities
Capacitance required to be introduced at different lengths to counter the effect of inductance

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