The present disclosures relates to a leakage sensor cable comprising a first conductive wire and a second conductive wire; a first conductive coating layer formed around the first conductive wire; a second conductive coating layer formed around the second conductive wire; a first permeable shell formed around the first conductive coating layer to form a first sensor cord; a second permeable shell formed around the second conductive coating layer to form a second sensor cord; wherein the first sensor cord and the second sensor cord are arranged together along their lengths to form a leakage sensor cable; and wherein the permeable shell is impregnated with electrolyte particles. The leakage sensor can be combined with a resistance-meter connected to the leakage sensor cable to form a leakage sensor assembly.