The thickness of the distribution box exceeds that of the wall

When a distribution box is thicker than the wall, it should be recessed, reinforced, and properly supported to ensure safety and structural integrity.Recessing the BoxIf the distribution box exceeds the wall thickness, the back of the box should be recessed into the wall by at least 20mm to accommodate the extra thickness and prevent protrusion . This ensures the box is level with the wall surface after plastering and finishing.Reinforcement MeasuresFor walls thinner than the box, asbestos boards or steel mesh can be installed at the back to prevent cracking .Concrete or cement mortar should be filled around the box to secure it firmly and distribute pressure evenly .For wide boxes (over 300–500mm), reinforced brick or concrete lintels should be installed on top to relieve pressure from wall bricks and prevent deformation .Anti-Corrosion and FinishingThe parts of the box in contact with the wall should be coated with anti-corrosion paint to prevent rust and deterioration .Ensure the box is level, horizontal, and vertical, with minimal deviation (vertical deviation ≤3mm) to maintain proper alignment .Safety and AccessibilityMaintain no gaps around the box and ensure edges are close to the wall .Internal wiring should be neat, labeled, and accessible, with the door able to open at least 180° for maintenance .Use proper cement mortar or fireproof sealing materials to fill gaps and prevent wall cracking or water ingress .SummaryWhen the distribution box is thicker than the wall, recessing, reinforcement, and proper sealing are essential. Concrete or brick lintels, anti-corrosion coatings, and careful plastering ensure the box is secure, aesthetically aligned, and safe for electrical installation . Proper planning and installation prevent structural damage and maintain long-term reliability.