Electrical Cables
The breakdown voltage of a cable depends on

Presence of moisture
All of the listed here
Working temperature
Time of application of the voltage

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

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
Of corona loss between conductor and sheath material

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