Discussion
Ground fault in underground cables is defined as:
Answer: D
A ground fault in an underground cable is a fault in which current flows from the core of the cable to the earthed lead sheath because the insulation between them has failed. A flow of current between two cores of the same cable is a short circuit or a fault between cores, and an open circuit in the core or in the lead sheath is a break in the conductor caused by damage. The answer is flow of current from the core of the cable to the lead sheath due to insulation failure, option (D).
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