IESNA lighting distribution types and their applications | ZGSM
Illuminating Engineering Society of North America (IESNA) is an organization dedicated to research and standards development for
Classification Code of Lighting Distribution Boxes
Lighting distribution boxes are classified under the Uniclass code Pr_60_70_22, which standardizes their identification in construction and electrical design.
Uniclass Classification
Lighting distribution boxes, along with other switchboards and electrical distribution equipment, are categorized in the Uniclass system under the code Pr_60_70_22 . This code is part of the latest Uniclass Products table (v1.42, April 2026) and is used to standardize product identification for construction projects, ensuring consistency in documentation, procurement, and design workflows. Uniclass codes are widely adopted in the UK and internationally for BIM (Building Information Modeling) and project management.
Electrical and Lighting Standards
Distribution boxes are also referenced in Division 26 of construction standards, which covers electrical and lighting systems, including power distribution, switchboards, and on-site generation . These standards ensure that lighting distribution boxes meet safety, performance, and installation requirements.
Luminaire and Light Distribution Classification
While the Uniclass code identifies the physical distribution box, the light distribution inside the box is classified according to standards such as EN 13032-2 and CIE 040-1978 . These standards define parameters for luminous flux distribution, including:
- Direct and indirect light ratios
- Luminous flux fractions in solid angle ranges
- Upward flux fraction (UFF) This classification helps designers understand how light is distributed from luminaires connected to the distribution box, ensuring efficient illumination for indoor or outdoor applications.
Practical Implications
- Design and Procurement: Using the Uniclass code Pr_60_70_22 allows architects and engineers to specify the correct type of distribution box in project documentation.
- Compliance: Ensures adherence to electrical safety and lighting standards.
- Integration with BIM: Facilitates digital modeling and coordination of lighting systems in construction projects. In summary, lighting distribution boxes are primarily classified under Uniclass Pr_60_70_22, while the light output and distribution from connected luminaires are further classified using EN 13032-2 and CIE 040-1978 standards to ensure proper illumination and compliance with design requirements .
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