Electrical Cables
In the cables, sheaths are used to

Provide enough strength
None of the listed here
Provide proper insulation
Prevent the moisture from entering the cable

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

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

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