Abstract: Currently, top-entry electrical cabinets are widely used in China. However, such cabinets are prone to issues such as water leakage from walls or roofs, or seepage of oil and water through fireproof seals at cable entry points, which can flow into the cabinet along the incoming cables. This may cause short circuits in the live components inside the cabinet, leading to electrical accidents. This paper proposes a leakage monitoring and early warning system for top-entry electrical cabinets, which can effectively detect the ingress of water or oil along the top-entry cables into the cabinet. The system provides timely alerts and dries the cabinet to prevent short circuits in the live components and avoid electrical accidents..