Electrical Cables
The inter sheaths in the cables are used to

Provide proper stress distribution
Avoid the requirement of good insulation
None of the listed here
Minimize the stress

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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
Insulation may melt due to higher temperature
Of corona loss between conductor and sheath material

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