Installation process of embedded distribution box

Embedded installation of a distribution box involves precise wall embedding, support, alignment, and anti-corrosion measures to ensure safety and durability.

Installation Height and Position

For embedded distribution boxes, the bottom edge of the box should be 1.5 meters from the ground, and the installation board should be at least 1.8 meters high. The box must be placed flat and vertical, with a deviation of no more than 3 mm, and the edges of the panel should align with the wall surface without being recessed or protruding .

Structural Support

• For boxes wider than 500 mm, a concrete lintel should be installed on top.
• For boxes 300 mm or wider, a reinforced brick lintel is recommended to prevent pressure on the box.
• When embedding in walls 240 mm thick, the back of the box should be recessed at least 20 mm, reinforced with a 10 mm asbestos board or a steel wire mesh (10 mm × 10 mm, 2 mm diameter), and plastered with 1:2 cement mortar to prevent cracking .

Pre-Buried Installation Method

A pre-buried installation involves creating a support device that holds the distribution box in the predetermined position before concrete pouring. The reserved electrical pipelines are connected to the box, and formwork is poured around it. After curing, the support device is removed, leaving the box securely embedded. This method simplifies construction, reduces labor costs, and ensures precise alignment and safety .

Fixing and Alignment

• The box should be level with the wall painting layer and not skewed.
• Surrounding gaps should be filled with cement mortar, and contact surfaces coated with anti-corrosion paint.
• Knock-out holes on the box should be opened according to actual wiring needs.
• During initial installation, the box should be supported to prevent damage from wall load or terminal installation .

Surface vs Flush Mounting

• Surface-mounted boxes are fixed with expansion bolts or wooden bricks embedded in the wall.
• Flush-mounted boxes require a reserved hole 20 mm larger than the box dimensions, with concrete or mortar used to secure the box firmly .

Key Considerations

• Ensure horizontal and vertical alignment with a deviation of no more than 3 mm.
• Use anti-corrosion coatings on contact surfaces.
• Provide adequate structural support for wider boxes.
• Pre-buried methods improve installation quality, safety, and ease of later wiring . By following these procedures, embedded distribution boxes can be installed safely, maintain aesthetic alignment, and ensure long-term durability.