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. 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. A Waterproof Distribution Box might not sound like the most exciting thing, but honestly, it's pretty crucial when it comes to modern electrical setups. These boxes are there to keep everything safe and working smoothly—no matter where you've got them installed. I spoke with John Stevens, who's a. This article will introduce in detail the installation method of distribution box to help everyone better understand and master this skill. Select the appropriate power distribution box: Select the appropriate box model and specifications based on the project requirements and. Distribution boxes are a component of your electrical supply system dividing electrical power feeds into subsidiary circuits while offering a protective fuse or circuit breaker for every circuit in a common enclosure. Usually, waterproof distribution box devices will be labeled with their IP codes. If it's done poorly, you risk short circuits, fire hazards, or system failure.