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Three-level distribution box with electricity meter for construction site use

A three-level electricity distribution box system for construction sites consists of a primary, secondary, and tertiary distribution box, forming a complete protection and power distribution system for safe and efficient temporary construction power.Overview of Three-Level Distribution

Construction sites require specialized power distribution systems to ensure safety, compliance, and flexibility. The three-level distribution system is designed to provide one machine, one switch, and one protection at each level, forming a robust and standardized setup for temporary or semi-permanent construction power .

Level I: Primary Distribution Box
  • Serves as the main distribution point for the construction site.
  • Receives three-phase power, ground, and neutral wires from the transformer.
  • Features bottom entry and exit cables, copper busbars for reliable connections, and a metering system for monitoring power usage.
  • Equipped with main circuit isolation, main circuit breaker, and main fuse.
  • Designed with a rainproof top and front-opening doors for outdoor use .
Level II: Secondary Distribution Box
  • Acts as a sub-distribution box, supplying power to specific areas, floors, or buildings within the site.
  • Features inner and outer doors, powder-coated exteriors, and rainproof tops for safety and durability.
  • Contains main circuit general isolation, fuses, and circuit breakers, along with shunt isolation and shunt breakers.
  • Forms part of the three-level protection system, ensuring that power is safely distributed from the primary box to multiple points .
Level III: Tertiary Distribution Box
  • Serves as the final junction box for individual electrical appliances or equipment.
  • Can be movable or fixed, depending on site requirements.
  • Equipped with leakage protection switches (RCDs) to prevent electrical hazards.
  • Ensures that each appliance is connected to a dedicated protective device, following the principle of “one machine, one switch, one RCD, one box, one lock” to avoid overloading or unsafe connections .
Protection and Safety Features
  • Two-level protection: Leakage protection is installed both in the tertiary switch box and in the upper-level distribution boxes.
  • Isolation and circuit breakers at each level prevent accidental overloads and short circuits.
  • Rainproof and durable enclosures allow safe outdoor installation.
  • Compliance with construction electricity standards ensures safety for workers and equipment .
Practical Applications
  • Suitable for civil building sites, market areas, outdoor events, and temporary construction projects.
  • Can be pre-wired and wall-mounted or installed on supports for flexibility.
  • Designed for easy relocation and reuse across multiple construction sites . This three-level distribution system ensures efficient power management, safety, and compliance on construction sites, making it an essential component for temporary electrical installations.
Three-level distribution box with electricity meter for construction site use

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Technical note

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