Electrical Cables
In the cables, sheaths are used to

None of the listed here
Provide enough strength
Prevent the moisture from entering the cable
Provide proper insulation

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Electrical Cables
Capacitance grading of cable implies

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

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