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What can be the causes of damage to PVC cables and paper insulated cables?

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In case of PVC cables the mechanical damage during excavation or by any other means may other means may cause a breaking of conductor or a short circuit between conductors of different phases or a short circuit between the conductor and earth. In case of PILC cables, a puncture of the lead sheath during excavation or by any vibration or by any chemical action of corrosive compounds of soil may cause an ingress of moisture resulting damage to the insulation and consequent short circuits. Defective conductors having uneven size and broken strand of conductors excessive drainage of impregnated oil due to the crack in lead shealth or improper end seals and deterioration of oil compound due to heating caused by dielectric losses or overload or poor heat dissipation or exposure to external heat source can be the causes of damage to the cable.

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