Low-voltage distribution boxes in Norway typically follow modular standards, with individual modules around 192 mm wide, and overall dimensions varying by configuration and manufacturer.

Standard and Regulatory Context

In Norway, low-voltage distribution boxes must comply with NEK 400, which governs the design, safety, and installation of electrical low-voltage systems . While NEK 400 specifies safety, accessibility, and installation requirements, it does not mandate exact physical dimensions. Instead, dimensions are determined by the number of modules, rated current, and intended application (residential, commercial, or industrial).

Modular System Dimensions

Many manufacturers, such as CUBIC, use a modular system for low-voltage distribution boxes. Key points include :

• Module width: 192 mm per module
• Height and depth: Typically designed to accommodate standard electrical components, with heights ranging from 600 mm to 2000 mm and depths from 200 mm to 400 mm depending on the number of modules and internal busbar arrangements
• Flexibility: Boxes can be extended or reconfigured by adding or removing modules

Example Configurations

• Small residential box: Often 1–2 modules wide, around 192–384 mm, with a height of 600–800 mm and depth of 200–250 mm
• Medium commercial box: 3–6 modules wide, height 1000–1600 mm, depth 250–350 mm
• Large industrial or prefabricated LV skids: Can be several meters wide and over 2 meters tall, designed for high current ratings and multiple outgoing circuits

Practical Considerations

• Installation space: Ensure sufficient clearance around the box for maintenance and compliance with NEK 400 accessibility requirements
• Customization: Many boxes are configurable to match project-specific requirements, including the number of breakers, busbar size, and auxiliary equipment
• Compliance: All boxes should be verified according to IEC/EN 61439 standards for low-voltage switchgear In summary, while there is no single fixed dimension for low-voltage distribution boxes in Norway, modular widths of 192 mm per module are common, and overall height and depth vary according to the number of modules and application type. Always consult the manufacturer's specifications and NEK 400 guidelines for precise installation requirements.