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Classification of switchboards in distribution boxes

Optical access and telecom site reference Published 25 Feb 2026

Use this reference to prepare product questions for CGWEB NETWORKS. Check interfaces, capacity, protection and installation requirements against the current product documentation.

Switchboards in distribution boxes are classified based on function, application, and design, including service entrance, main LV, final distribution, functional, fusible, metering, and draw-out types.

Overview of Switchboards

A switchboard is a central component in an electrical distribution system that divides incoming power into branch circuits while providing protection through circuit breakers or fuses. They ensure safe and reliable power distribution in residential, commercial, and industrial facilities, and are designed to meet standards such as UL891 and NEMA PB2. Switchboards can handle high currents (up to 6000 A) and voltages (up to 600 V), and are typically freestanding units requiring front access.

Main Classifications

Service Entrance Switchboards

Installed at the point where power enters a building from the utility. Distributes electricity to downstream circuits and may include metering and main protection devices. Common in smaller facilities and designed to meet utility-specific requirements.

Main Low-

Voltage Switchboards (MLVS)Serve as the primary distribution point in large commercial or industrial installations. Divide incoming power into multiple circuits, each protected by fuses or breakers. Often modular, allowing for future expansion and high reliability.

Final Distribution Switchboards

Located closer to the load points, distributing power to specific equipment or areas. Can be sub-distribution boards for heating, lifts, or industrial processes.

Functional or Modular Switchboards

Designed for specific applications with standardized modules. Include switchgear, fusegear, and control devices mounted on a chassis. Front panels house meters, indicators, and pushbuttons for monitoring and control.

Fusible Switchboards

Use fuses for circuit protection and isolation. Common in commercial and industrial environments where reliable protection is required.

Metering Switchboards

Combine circuit breakers, surge protection, and metering in one unit. Allow individual energy measurement for commercial multi-metering applications.

Draw-

Out Molded Case Switchboards

Feature draw-out capability for feeder breakers, enabling quick replacement without system downtime. Often used in critical applications like healthcare and data centers.

Design Considerations

Switchboards are designed to protect human life and equipment, considering IP and IK ratings for enclosure protection. Component placement within the enclosure is critical for safe operation, clearances, and future modifications. Modern switchboards may include digital monitoring, smart features, and high-density configurations for efficient space utilization.

Summary

Switchboards in distribution boxes are classified primarily by function and application: from service entrance and main LV boards to final distribution, functional, fusible, metering, and draw-out types. Each type is tailored to meet specific load requirements, safety standards, and operational needs, ensuring reliable and safe power distribution across all levels of an electrical installation.

Classification of switchboards in distribution boxes - CGWEB NETWORK INFRASTRUCTURE [PDF]

Classification of switchboards in distribution boxes

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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