Electrical Cables
The breakdown voltage of a cable depends on

Time of application of the voltage
All of the listed here
Presence of moisture
Working temperature

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Electrical Cables
Capacitance grading of cable implies

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

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