Electrical Cables
The inter sheaths in the cables are used to

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

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

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

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