An electrical cable includes a core having a conductor, insulation surrounding the conductor, and an outer sheath surrounding the core. A portion of the conductor is stripped bare at a free end and a cavity is formed within the insulation at the cable free end. First and second shims are concentrically secured to the exposed portion of the conductor such that end portions of the shims are positioned adjacent to the cavity. The bare conductor is secured within a barrel portion of a terminal lug. A first sealing mastic material is disposed within the cavity and heated to encapsulate end portions of the shims. A second sealing mastic material is applied around the lug barrel portion, first and second shims, and a portion of the outer sheath. A heat shrinkable tube having an inner surface of zinc oxide stress control mastic material is secured around the second sealing mastic material.