Embedded boxes in distribution boxes typically range from 200 × 200 × 120 mm up to 800 × 600 × 300 mm, depending on the type and number of circuits.

Typical Dimensions

Embedded distribution boxes, also known as flush-mounted DB boxes, are designed to fit within walls while housing circuit breakers, bus bars, and other electrical components. Common wall-mount embedded box sizes range approximately:

• Small residential boxes: 200 × 200 × 120 mm
• Medium boxes: 400 × 300 × 150 mm
• Large boxes for commercial or industrial use: 800 × 600 × 300 mm These dimensions refer to the external enclosure, while the internal usable space is slightly smaller due to wall thickness, door returns, and mounting hardware .

Installation Considerations

• Height from floor: The bottom edge of the embedded box should be at least 1.5 m from the ground for distribution boxes, and 1.8 m for distribution board installation panels .
• Alignment: The box must be level and vertical, with a deviation of no more than 3 mm, and the edges should be flush with the wall surface .
• Structural support: For boxes wider than 500 mm, concrete lintels are recommended above the box; for widths over 300 mm, reinforced brick lintels should be used to prevent pressure damage .
• Wall embedding: The surrounding space should be filled with cement mortar, and anti-corrosion paint should be applied to parts in contact with the wall .

Additional Notes

• Knock-out holes: Embedded boxes come with pre-punched knock-out holes that can be removed according to wiring needs .
• Material: Most embedded boxes are made from thermoplastics (PC, ASA) or epoxy/powder-coated steel, providing durability and electrical safety .
• Types: Flush-mounted embedded boxes are common in modern homes and offices, while smart DB boxes may include energy monitoring and communication modules . By following these dimensions and installation guidelines, the embedded box will provide a secure, level, and accessible housing for electrical components while maintaining wall integrity and safety.