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A sub-board, also known as a sub-distribution board or sub-panel, is a secondary electrical distribution board that is connected to the main distribution board (DB board) within a building or facility. It serves the purpose of distributing electrical power to specific areas, zones, or circuits within a building, while being controlled and protected by the main DB board.

Key features and functions of a sub-board include:

1. Localized Power Distribution: A sub-board is used to distribute power to a specific area or section of a building, such as a particular floor, wing, or room.

2. Circuit Protection: Like the main DB board, sub-boards also include circuit breakers, fuses, or other protective devices to prevent overloads, short circuits, and other electrical faults within the localized area.

3. Load Management: Sub-boards help manage the electrical load by dividing it into smaller sections. This prevents overloading of the main DB board and ensures balanced distribution.

4. Isolation: In case of maintenance or repairs, a sub-board can be isolated without affecting the rest of the building's electrical system.

5. Distributed Control: Sub-boards provide localized control over circuits, allowing for convenient management of power in specific zones.

6. Flexibility: They offer flexibility in electrical distribution, accommodating different needs and requirements of various sections within the building.

7. Expansion: Sub-boards can be added as the building's electrical needs grow, providing a scalable solution for power distribution.

8. Reduced Cable Lengths: By localizing power distribution, sub-boards can reduce the length of electrical cables, minimizing voltage drop and improving efficiency.