Distribution box hole spacing dimensions

The hole for a distribution box should be about 20 mm larger than the box's length and width, with a depth equal to the box thickness plus the plastering thickness of the wall.Recommended Hole DimensionsWhen embedding a distribution box in a wall:Length and Width: Reserve a hole approximately 20 mm larger than the distribution box on all sides to allow for proper fitting and adjustment during installation .Depth: The hole depth should be the thickness of the distribution box plus the plastering thickness of the inner wall .Clearance: Ensure the box is installed firmly, horizontally, and vertically, with a vertical deviation not exceeding 3 mm .Gap Management: For concealed installations, there should be no gap around the box, and the edges should be close to the wall. Anti-corrosion paint can be applied to the contact surfaces between the box and the wall .Installation TipsFixing: Use expansion bolts or embedded wood bricks depending on the wall type and box size .Protection: Ensure smooth wire holes and insulation sleeves to prevent damage to cables .Accessibility: Maintain proper height (typically around 1.5–1.8 m) for easy operation and maintenance .Future Expansion: Consider slightly larger boxes if additional circuits may be added later . By following these guidelines, the distribution box will fit securely, allow for proper wiring, and comply with safety standards.