Household electrical distribution boxes in Angola are designed to safely manage residential circuits, with dimensions and specifications varying by the number of switches, wire size, and intended use.

General Specifications

Household distribution boxes serve as centralized points for managing electrical circuits, protecting connections, and ensuring safety against short circuits, moisture, and mechanical damage . They are typically made from flame-resistant ABS plastic or GI modular steel, providing durability and insulation . Boxes can be surface-mounted or flush-mounted, depending on installation requirements .

Sizing Guidelines

The dimensions of a distribution box depend on the number of switches and the size of incoming wires:

• For small power or lighting circuits (incoming wire <10 mm², fewer than 20 switches):
  • Width: Sum of switch widths + 20 mm on each side
  • Height: Switch height + 40 mm
  • Depth: Maximum switch depth + 10 mm
• For more than 20 switches:
  • Two rows of switches are recommended
  • Width: Sum of switch widths + 40 mm
  • Height: Switch height + 40 mm
  • Depth: Maximum switch depth + 10 mm
• For larger incoming wires (>10 mm²), additional space is required for bending radius and terminal connections .

Typical Dimensions of Plastic Distribution Boxes

Examples of commonly used plastic distribution boxes include the MB-ABC series:

These boxes comply with BS EN60439-3 and JB/T7121-93 standards, ensuring flame-proof, impulse-proof, and excellent insulation properties .

Commercial Options in Angola

• GI Modular Boxes: Steel modular boxes suitable for residential and commercial installations .
• Ready Board 2 Sockets: Pre-wired low-voltage boards with 2 sockets, 1 lamp, and wall-mounting lugs, suitable for small residential or commercial setups .
• Local suppliers: Companies like Avida Iluminação provide a range of surface-mounted and flush-mounted boxes for light points, sockets, and distribution panels .

Installation Considerations

• Ensure adequate spacing for wiring and terminal connections.
• Mount boxes at accessible heights for maintenance.
• Use proper insulation and grounding to comply with safety standards.
• Consider future expansion by selecting boxes with extra knockouts or modular capacity . By following these specifications and selecting appropriately sized boxes, residential electrical systems in Angola can achieve safe, organized, and durable installations.