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How many secondary distribution boxes are needed for each floor

Typically, one secondary distribution box (SDB) is installed per floor or per designated zone within a building, depending on load requirements and floor layout.Overview of SDB Placement

A secondary distribution box (SDB) serves as an intermediate distribution point between the main distribution board (MDB) and the final distribution boards (DBs) that supply individual loads such as lighting, sockets, and equipment . In multi-story buildings, SDBs are usually installed per floor to ensure efficient power distribution, reduce long cable runs, and minimize voltage drops . For larger floors or areas with high electrical demand, multiple SDBs may be installed to divide the load into manageable sections .

Factors Determining the Number of SDBs
  1. Load Calculation: The total electrical load on a floor determines whether a single SDB is sufficient or if multiple SDBs are needed. High-density areas with heavy equipment may require more than one SDB .
  2. Floor Area and Layout: Large or irregularly shaped floors may need multiple SDBs to ensure all areas are within safe cable distance limits and to maintain voltage stability .
  3. Safety and Redundancy: Installing multiple SDBs can improve reliability, allowing one section to remain powered if another SDB experiences a fault .
  4. Zoning: Floors can be divided into zones (e.g., office areas, mechanical rooms, common areas), with each zone served by its own SDB for better control and protection .
Typical Hierarchy

The electrical distribution hierarchy in a building is generally as follows :

  • MDB (Main Distribution Board): Receives power from the transformer and distributes it to SDBs.
  • SDB (Secondary Distribution Board): Intermediate board per floor or zone, distributing power to DBs.
  • DB (Distribution Board): Final board supplying individual circuits to equipment, lighting, and sockets.
Practical Recommendation
  • Standard Approach: Install one SDB per floor for typical residential or office buildings.
  • High-Demand Floors: Consider two or more SDBs if the floor has high electrical loads, large area, or multiple zones.
  • Load Planning: Conduct a detailed load calculation to determine the exact number of SDBs required, ensuring each board can handle the expected demand without frequent tripping or overheating . In summary, while one SDB per floor is common, the final number depends on load, floor size, zoning, and safety considerations. Proper planning ensures efficient, safe, and reliable power distribution throughout the building.
How many secondary distribution boxes are needed for each floor

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Technical note

This reference is intended for preliminary ODN and passive infrastructure research. Topology, split ratio, box or cabinet capacity, closure rating, cable type, test limits and applicable standards must be verified for the specific project.

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