Question: A single core lead covered cable is to be designed for 6 6 kV to earth. Its conductor radius is 0 . 5 cm and

A single core lead covered cable is to be designed for 66 kV to earth. Its conductor radius is 0.5 cm and its three insulating materials A, B and C have relative permittivity of 4,2.5 and 4.0 with maximum permissible stresses of 50,30 and 40 kV/cm respectively. Determine the minimum internal diameter of the lead sheath. Discuss the arrangement of the insulating materials.

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