Electrical Cables
In single core cables armouring is not done to

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

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

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
Of corona loss between conductor and sheath material

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