Electrical Cables
The material for armouring on cable is usually

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

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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
Grading according to capacitance of cables per km length
Use of dielectrics of different permeabilities
Cables using single dielectric in different concentrations

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