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Switch level of the distribution box

Switch level of the distribution box

Switch level of the distribution box - MADIBA BAY OPTICS

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Distribution boxes are organized in three levels—primary, secondary, and tertiary—each with specific switches and protection devices suited to the load and application.

Overview of Distribution Levels

  1. Primary Distribution (Level 1)
    • Connects directly to the low-voltage side of the transformer (typically 0.4 kV) and serves as the main distribution cabinet.
    • Contains isolation switches, circuit breakers, and leakage protectors to manage large incoming power safely.
    • Not intended for direct use by electrical equipment; it mainly protects and distributes power to secondary boxes .
  2. Secondary Distribution (Level 2)
    • Receives power from the primary distribution cabinet and distributes it to buildings or units.
    • Equipped with large three-phase circuit breakers and sometimes leakage protection switches.
    • Designed for three-phase loads such as air conditioning, water heaters, or industrial equipment.
    • Typically installed about 1.5 meters above the ground for accessibility .
  3. Tertiary Distribution (Level 3)
    • The final distribution point before reaching individual appliances or households.
    • Contains single-phase circuit breakers and leakage protection switches for safety.
    • Can be movable or fixed, and directly connects to electrical appliances, ensuring protection against overloads and short circuits .

Switch Selection and Protection

  • Main Switch: Acts as the power supply terminal and provides isolation and backup protection for the distribution box. It should be selected based on the load and the need for selective protection between upstream and downstream breakers .
  • Circuit Breakers: Used at all levels to protect against overloads and short circuits. Level 1 uses high-capacity breakers, Level 2 uses three-phase breakers, and Level 3 uses single-phase breakers for household or small equipment loads .
  • Leakage Protection: Installed at Level 2 and Level 3 to prevent electric shock and ensure safety. The principle of "one machine, one switch, one protection" is recommended to avoid controlling multiple devices with a single switch .

Installation Considerations

  • Distribution boxes should be installed centrally relative to the load to balance three-phase power.
  • Boxes must be firmly fixed, level, and properly grounded, with clear separation of phase, neutral, and ground lines .
  • Wiring should follow the five-wire system: three-phase lines (A, B, C), neutral, and ground, with appropriate connections for 220V single-phase or 380V three-phase loads .

Key Takeaways

  • Level 1: Main distribution, high-capacity switches, isolation.
  • Level 2: Building-level distribution, three-phase breakers, leakage protection.
  • Level 3: End-user distribution, single-phase breakers, appliance-level protection.
  • Proper selection and installation of switches at each level ensure safety, reliability, and efficient power distribution. By following these guidelines, the distribution system can achieve hierarchical protection, balanced load distribution, and safe operation for construction sites, industrial facilities, or residential buildings.

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