Waterproof distribution box manufacturers tell you that the way to waterproof an outdoor distribution box is to first choose a distribution box made of waterproof material, seal the cable entry points, apply silicone sealant, install a weatherproof cover, use outdoor rated sockets. Waterproof distribution box manufacturers tell you that the way to waterproof an outdoor distribution box is to first choose a distribution box made of waterproof material, seal the cable entry points, apply silicone sealant, install a weatherproof cover, use outdoor rated sockets. Imagine opening an electrical distribution box only to find water droplets clinging to your expensive components like dew on morning grass. That's condensation—not just an annoying surprise, but a silent destroyer lurking in control cabinets worldwide. Whether it's an outdoor enclosure weathering. Waterproof distribution box moisture typically originates from condensation, gasket degradation, or cable entry leakage. Usually, rubber sealing rings or sealants are used for sealing to effectively prevent the intrusion of rainwater, sand and dust. In metro tunnel scenarios (tunnel sections, equipment corridors, evacuation passages), junction boxes need to withstand high humidity (relative humidity ≥95%), condensed water erosion, high-frequency vibration from train operation and dust accumulation, and are prone to problems such as reduced.