Electrical Cables
The thickness of the layer of insulation on the conductor, in cables, depends upon

Power factor
Current carrying capacity
Reactive power
Voltage

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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
Use of dielectrics of different permeabilities
Grading according to capacitance of cables per km length

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