Electrical Cables
The material for armouring on cable is usually

None of the listed here
Steel tape
Galvanized steel wire
Both Steel tape and Galvanized steel wire

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Electrical Cables
Capacitance grading of cable implies

Grading according to capacitance of cables per km length
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

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