Shell: The shell of the power distribution box is usually made of steel plate or plastic material, which has the characteristics of waterproof, dustproof and anti-corrosion, and protects the internal electrical components from the external environment. This guide examines the critical structural components that define a high-quality enclosure, focusing on durability and ingress protection for professional installations. A. Plastic is light and good for inside use. This keeps your electrical system working well. The key material requirements for distribution box are used in constructing an electrical distribution box play a crucial role in its durability, safety, and overall performance.