Specifications and dimensions of electrical distribution boxes for construction sites in Chad

Construction site distribution boxes are typically pre-wired, robust, and designed for outdoor use, with capacities ranging from 32A to 315 KVA, IP33–IP65 protection, and durable enclosures suitable for temporary installations.

General Specifications

Construction site distribution boxes are designed to safely distribute electrical power in temporary or semi-permanent settings. Key features include:

• Material and Construction: Boxes are made from 2 mm galvanized steel sheets or technopolymer cabinets with fire-resistant backrests, ensuring durability and reusability on multiple sites . Reinforced structures with proper hinges and locking mechanisms provide security and mechanical stability .
• Protection Rating: Boxes typically have IP33 to IP65 protection, preventing dust and water ingress, suitable for outdoor and tropical conditions .
• Mounting Options: Can be wall-mounted or installed on supports, allowing flexibility in site layout .

Electrical Features

• Voltage and Phases: Standard A.C. 3-phase, 4-wire systems, commonly 433–440 V, 50 Hz .
• Capacity Ratings: Available in 32A to 63A for small boards, and 63/100/160/315 KVA for larger distribution boxes .
• Busbars and Droppers: Phase busbars made of EC grade aluminum, with cross-sections such as 72x50x8 mm for 63/100 KVA and 120x50x15 mm for 160/315 KVA. Feeders and incomer droppers are sized accordingly for safe current handling .
• Circuit Protection: Equipped with MCCBs (triple-pole or four-pole), switch disconnectors, and porcelain cutouts for outgoing circuits. Features include thermal-magnetic trip units, test-trip buttons, and phase barriers for safety .
• Pre-wired Assemblies: Many boards come pre-wired, reducing installation time and ensuring compliance with safety standards .

Dimensions and Design

• Door and Enclosure: Hinged doors with rubber gaskets for sealing, overlapping collars for dust and water protection, and removable handles for secure access .
• Heat Dissipation: Louvers or perforated panels allow proper ventilation to prevent overheating .
• Weight and Handling: Technopolymer or steel enclosures are designed to be lightweight yet robust, facilitating transport and reuse across construction sites .

Environmental Suitability

• Designed for tropical climates, withstanding high ambient temperatures, humidity, and occasional rain .
• Suitable for civil building sites, outdoor events, and temporary installations, ensuring reliable power distribution under variable conditions .

Summary

For construction sites in Chad, distribution boxes should be selected based on current capacity, KVA rating, IP protection, and mounting requirements. Options include pre-wired technopolymer boards (32–63A, IP65) for smaller setups or larger steel enclosures (63–315 KVA, IP33) for high-capacity distribution. All boxes should include MCCBs, switch disconnectors, and properly sized busbars to ensure safety and compliance with international electrical standards .