There's not much we can recommend without seeing what you have.
Is this power line entering the house after the meter or before?
Does it run directly into a breaker panel?
Is it enclosed in conduit or exposed where and after it enters the home?
Outside the home, does the power line run underground to a tranformer box, up to a meter or an overhead connection?
There are too many variables for us to guess why it's leaking.
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