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Secondary distribution box at the construction site

Fiber and communications infrastructure knowledge brief Published 15 Aug 2020

Use this reference to prepare product questions for CJC FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

Secondary distribution boxes serve as intermediate power distribution points on construction sites, safely routing electricity from the main supply to buildings, floors, or zones.

Function and Purpose

Secondary distribution boxes, also called sub-distribution boxes, act as intermediate panels between the primary distribution box (main site panel) and tertiary distribution points (final equipment or household connections) on construction sites. They are designed to handle three-phase power and supply electricity to specific buildings, floors, or zones, rather than directly powering individual tools or appliances. This setup ensures efficient power management, safety, and reliability in complex construction environments.

Design and Features

Construction: Typically made with powder-coated exteriors and rainproof tops for outdoor use, ensuring durability against weather and site conditions. Doors: Equipped with inner and outer doors for safety and accessibility. Internal Components: Include large three-phase circuit breakers, isolating switches, and sometimes residual current devices (RCDs) to protect downstream equipment.

Portability: Many secondary boxes are mobile or transportable, with handles, floor supports, or wheeled carriages, allowing them to be moved around the site as needed. Safety Standards: Designed to comply with construction site electrical codes, following the principle of “one machine, one switch, one RCD, one box” to prevent electrical hazards. Applications on Construction SitesSecondary distribution boxes are used to: Supply power to individual buildings or floors on a construction site.

Serve as a centralized point for multiple circuits, allowing for easier monitoring and maintenance. Protect equipment and personnel by isolating circuits and providing residual current protection. Facilitate temporary or modular installations, especially in large-scale or multi-building projects.

Additional Considerations

Power Ratings: Available in various power levels, typically ranging from 17 kW to 130 kW, depending on site requirements. Customization: Can be configured with socket-outlets, DIN modules, or circuit breakers to match specific project needs. Durability: Designed to withstand impact, UV exposure, and temperature variations, making them suitable for outdoor and open-air construction environments.

In summary, secondary distribution boxes are essential for safe and efficient power distribution on construction sites, bridging the gap between the main supply and individual equipment or building circuits while providing flexibility, mobility, and compliance with safety standards.

Secondary distribution box at the construction site - CJC FIBRE CONSULTANTS [PDF]

Secondary distribution box at the construction site

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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