Get Started - Sub-Main Distribution Boards (SMDBs)

SMDBs are key players in the distribution of electrical power within large buildings or industrial facilities. They are essentially smaller versions of the main distribution board but placed strategically along the distribution chain. Think of them as hubs that receive power from the Main Distribution Board (MDB) and then distribute it to smaller circuits throughout a specific area of the building.

Key Purposes

  • Divide Power Supply: SMDBs break down the main power feed into several subsidiary circuits, distributing electricity to specific zones or groups of equipment.
  • Enhanced Control and Protection: SMDBs usually contain circuit breakers (MCCBs or MCBs) or fuses for each outgoing circuit. This provides localized protection and control over individual sections of the power distribution system.
  • Cost Savings: Using SMDBs can reduce cabling costs, as they allow shorter cable runs from the distribution point to the final loads.
  • Flexibility: SMDBs make it easier to modify or expand the electrical system in the future, as changes can often be accommodated locally at the SMDB level.

Typical Components

  • Enclosure: A robust metal enclosure (sheet steel) that provides protection and organization for internal components.
  • Busbars: Copper or aluminum conductors that carry the main incoming power.
  • Incomer: Typically a large MCCB (Molded Case Circuit Breaker) that connects the SMDB to the upstream main distribution board.
  • Outgoing Circuit Breakers: MCCBs or smaller MCBs (Miniature Circuit Breakers) protect and control individual outgoing circuits.
  • Metering (optional): Meters may be included to monitor energy consumption at the SMDB level.
  • Surge Protection (optional): Devices to safeguard against voltage spikes.

Common Applications

  • Large Commercial Buildings: SMDBs are used on different floors or sections of big buildings like shopping malls or hospitals.
  • Industrial Facilities: SMDBs distribute power to different workshops or production areas within a factory.
  • Remote Locations: SMDBs may be used to manage electricity distribution in remote buildings or substations.