Switchgear distribution boxes in West Africa are designed for low and medium voltage applications, with specifications covering busbar dimensions, insulation, earthing, enclosure protection, and cable entry standards.

Electrical and Mechanical Specifications

• Voltage Rating: Typically up to 660 V for low voltage (LV) distribution boards, with medium voltage (MV) switchgear rated up to 36 kV depending on the application .
• Power Ratings: Distribution boxes are available in capacities such as 63, 100, 160, and 315 kVA, with busbar and dropper sizes scaled accordingly .
• Busbars: Phase busbars are made of EC grade aluminum. For 63/100 kVA boxes, busbar strips are 72×50×8 mm; for 160/315 kVA boxes, 120×50×15 mm. Feeders and incomer droppers match these dimensions to handle full load currents .
• Insulation: All busbars and droppers are drilled and covered with PVC insulating sleeves, color-coded for phases (R, Y, B) to ensure safety and prevent short circuits .
• Neutral Busbar: Isolated from the enclosure body, with bimetallic lugs of adequate size and earthing points on both sides for proper grounding .

Enclosure and Construction

• Material: CRCA MS (Cold Rolled Close Annealed Mild Steel) strips of 2 mm thickness for mounting internal components; enclosures are fully enclosed for indoor or outdoor use .
• Doors and Sealing: Hinged doors with overlapping collars and rubber gaskets prevent dust and water ingress. Hinges are concealed to enhance security .
• Earthing: Earth clamps of 2 mm thickness, zinc-plated, with bolts and washers provided for incoming and outgoing cables .
• Cable Entry: Bottom plates with rubber glands allow secure cable entry. Glands have a minimum 1 mm thick rubber film to seal around cables, preventing moisture ingress .

Standards and Compliance

• Design Codes: Must comply with national and international standards for LV and MV switchgear, including safety, type-testing, and performance requirements .
• Installation: Suitable for floor or wall mounting, indoor or outdoor, with proper site erection, testing, and commissioning procedures .

Additional Features

• Miniature Substations: Some suppliers provide compact, underground substations for space-saving distribution, suitable for urban or industrial environments .
• Transformers Integration: Distribution boxes are often paired with cast resin dry-type transformers for safe, oil-free operation, with ratings from 50 kVA to 25 MVA .
• Customization: Boxes can be supplied new or refurbished, with options for specific project requirements, including metering units and on-load tap changers . These parameters ensure that switchgear distribution boxes in West Africa are robust, safe, and compliant with regional electrical standards, capable of handling full load currents while protecting circuits and equipment from environmental and operational hazards.