Electrical Cables
The insulating material for cables should

Be acid proof
Be non-inflammable
Be non-hygroscopic
All of the listed here

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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
Of corona loss between conductor and sheath material
Skin effect dominates on the conductor
Insulation may melt due to higher temperature

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