Electrical Cables
The breakdown of insulation of the cable can be avoided economically by the use of

Inter-sheaths
Insulating materials with different dielectric constants
None of the listed here
Both Inter-sheaths and Insulating materials with different dielectric constants

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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
Skin effect dominates on the conductor
There is a danger of breakdown of insulation due to the presence of voids

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