Dimensions of a 100A Distribution Box

A typical 100A distribution box measures approximately 229mm (H) x 305mm (W) x 114mm (D), though dimensions vary by manufacturer and configuration.

Standard Dimensions

For example, the Ryefield CO100TPN 3-way distribution board has dimensions of 229mm height, 305mm width, and 114mm depth, making it compact and suitable for limited installation spaces . This box is constructed from 18-gauge steel with a powder-coated finish for durability and corrosion resistance, and it accommodates 100A fuse units with a busbar capacity of up to 400A .

Other 100A distribution boxes, such as flush-mounted models like the Schneider Electric DBSet 16-way, may have slightly different dimensions depending on the number of modules, rows, and mounting type. These enclosures are typically made of painted sheet steel with thickness around 1.2mm and comply with standards like IEC 61439-1 and IEC 61439-3 .

Key Considerations

• Mounting Type: Surface-mounted boxes are generally deeper, while flush-mounted boxes are shallower to fit within walls.
• Number of Circuits: More circuits or modules increase the width and sometimes the height of the box.
• Material and Protection: Steel or plastic enclosures affect thickness and overall dimensions; IP and IK ratings may also influence size.
• Cable Entry: Boxes with larger cable clamps or multiple entry points may require additional depth.

In summary, while 229mm x 305mm x 114mm is a common size for a 100A distribution box, always check the manufacturer's datasheet for exact dimensions based on the specific model, number of circuits, and mounting requirements .