Electrical Cables
The material for armouring on cable is usually

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

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Electrical Cables
Solid type cables are considered unreliable beyond 66 kV because

Of corona loss between conductor and sheath material
Skin effect dominates on the conductor
There is a danger of breakdown of insulation due to the presence of voids
Insulation may melt due to higher temperature

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