Sub Main Distribution Board (SMDB)

---

A Sub Main Distribution Board is an electrical panel that divides the electrical power from the Main Distribution Board into subsidiary circuits, providing power to various parts of a building. It acts as an intermediary between the MDB and the final distribution boards.

Key Features:

Circuit Breakers: Protect the system from overloads and short circuits.

Safety Switches: Isolate parts of the system for maintenance or emergency purposes.

Surge Protection Devices: Mitigate the risk of power surges.

Main Disconnect: Allows for the complete disconnection of the electrical supply for maintenance.

Ground Fault Circuit Interrupters (GFCIs): Provide additional protection against electric shock.

Functions of an SMDB:

Power Distribution: Distributes electrical power to various parts of the building.

Protection: Safeguards the electrical system from faults and overloads.

Isolation: Allows for safe maintenance by isolating parts of the system.

Monitoring: Provides a central point for monitoring the status of the electrical system.

Applications:

SMDBs are commonly used in:

Commercial Buildings: To distribute power to lighting, HVAC systems, and office equipment.

Industrial Facilities: For powering machinery, motors, and other industrial equipment.

Residential Areas: For distributing power to household appliances and lighting.