Electrical Cables
In single core cables armouring is not done to

Make it flexible
None of the listed here
Avoid excessive sheath losses
Either of the listed here

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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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