Secondary distribution boxes in East Africa typically range from 300 mm to 600 mm in width, 400 mm to 800 mm in height, and 150 mm to 300 mm in depth, depending on the number of circuits and manufacturer specifications.

Typical Sizes and Configurations

Secondary distribution boxes, also known as DB boxes or load centers, are used to safely distribute electrical power from a main supply to multiple circuits in residential, commercial, and industrial buildings. In East Africa, these boxes are commonly designed for low-voltage networks and follow international standards adapted to local requirements .

• Small residential DB boxes: Usually accommodate 4–12 ways (circuits) and have approximate dimensions of 300–400 mm width, 400–500 mm height, and 150–200 mm depth .
• Medium commercial DB boxes: Typically support 12–24 ways and measure around 400–500 mm width, 600–700 mm height, and 200–250 mm depth .
• Large industrial DB boxes: Can handle 24–36 ways or more, with dimensions of 500–600 mm width, 700–800 mm height, and 250–300 mm depth .

Materials and Design Considerations

Most secondary distribution boxes in the region are made from engineering thermoplastics like polycarbonate or ASA, or powder-coated stainless steel, providing durability, fire resistance, and protection against environmental factors . They often include features such as:

• Circuit breakers and RCCBs for overload and fault protection
• Isolators for maintenance
• Cable management systems for neat wiring
• Optional smart modules for energy monitoring and remote control

Installation Notes

• Boxes are generally wall-mounted indoors, with sufficient clearance for wiring and maintenance.
• The size selection depends on the number of circuits, future expansion, and compliance with local electrical codes.
• Eskom-approved or equivalent enclosures are often used in East Africa to ensure compatibility with utility standards . In summary, while exact dimensions vary by manufacturer and application, secondary distribution boxes in East Africa typically fall within the ranges mentioned above, providing flexibility for residential, commercial, and industrial installations.