Effective corrosion control treatment and distribution system maintenance can reduce corrosion products on the metal surfaces and in the bulk water and sediment, and lower disinfectant demand, allowing for better control of microbial growth and other benefits. Low disinfectant residual can increase the potential for microbial growth including the growth of opportunistic pathogens. If the surface of outdoor electrical junction box is damaged, the exposed steel surface of waterproof electrical junction box will react with the atmosphere to repair itself, reforming the oxide "passivation film" and allowing weatherproof enclosure box to continue to play a protective role. These guidelines provide information on how to evaluate electrical equipment that has been exposed to water through flooding, fire-fighting activities, hurricanes, and other events involving large quantities of water. It is designed for use by suppliers, installers, inspectors, and users of. Abstract – Corrosion can severely impact the safety and reliability of power distribution equipment while imparting significant costs to the end user. This paper will discuss the root cause of corrosion, the monetary effect of early product failures and unplanned outages, and available solutions. In order to prevent the rust of the distribution box, the following measures can be taken: Choose anti-rust materials: choose corrosion-resistant and anti-rust materials, such as stainless steel or galvanized steel sheets, to ensure that the surface of the cabinet is not easy to rust.