Standard dimensions of secondary distribution boxes in the Middle East

Secondary distribution boxes in the Middle East typically come in standardized modular sizes, often wall- or floor-mounted, with dimensions varying according to current rating and manufacturer specifications.

Typical Dimensions and Configurations

Secondary distribution boxes (SDBs) or Sub Main Distribution Boards (SMDBs) are designed to distribute power from the main distribution panel to branch circuits. In the Middle East, manufacturers like Al Hamad Switchgear provide type-tested SMDBs in three complementing sizes for current ratings up to 800A, suitable for residential, commercial, and industrial applications . These boxes are usually wall-mounted but can also be floor-mounted depending on the installation requirements . While exact dimensions vary, typical ranges for SMDBs and SDBs include:

• Height: 600 mm to 1800 mm
• Width: 400 mm to 800 mm
• Depth: 200 mm to 400 mm These dimensions accommodate MCCBs and MCBs, terminal blocks, and wiring space, while ensuring compliance with IEC 61439 standards and regional utility specifications for high ambient temperatures (up to 50°C), .

Material and Construction

• Enclosure: Powder-coated steel or galvanized sheet metal for durability in harsh climates .
• Ventilation: Adequate natural air circulation with screened apertures to prevent vermin entry .
• Interchangeable parts: Modular design allows for easy maintenance and expansion .

Regional Standards and Considerations

• Compliance with SASO standards in Saudi Arabia and other Gulf countries is common .
• Designed to withstand extreme temperatures and dust, typical of Middle Eastern environments .
• Modular and compact designs facilitate installation in high-rise buildings, hotels, and industrial facilities .

Summary

Secondary distribution boxes in the Middle East are modular, robust, and type-tested, with dimensions generally ranging from 600–1800 mm in height, 400–800 mm in width, and 200–400 mm in depth, depending on current rating and application. They are designed for wall or floor mounting, comply with IEC 61439 and regional standards, and are built to endure high temperatures and harsh environmental conditions .