External dimensions of the three-level distribution box

The external dimensions of a three-level distribution box typically vary by capacity and manufacturer, but standard LT distribution boxes are generally in the range of 600–1200 mm in width, 800–18...

External dimensions of the three-level distribution box

The external dimensions of a three-level distribution box typically vary by capacity and manufacturer, but standard LT distribution boxes are generally in the range of 600–1200 mm in width, 800–1800 mm in height, and 300–600 mm in depth.

Typical Construction and Dimensions

Three-level distribution boxes are designed to house electrical components in a vertical arrangement, with each level serving a specific function such as main incomer, intermediate busbars, and final outgoing feeders . The enclosure is usually fabricated from 2 mm to 3 mm thick cold-rolled or stainless steel sheets, with reinforced channels for structural stability . Doors are often dual-layered with concealed hinges, and the box may include a slanted roof for water runoff in outdoor installations .

Approximate External Dimensions

  • Height: 800 mm to 1800 mm, depending on the number of levels and KVA rating
  • Width: 600 mm to 1200 mm, sufficient to accommodate busbars, MCCBs, and cable entry
  • Depth: 300 mm to 600 mm, allowing for proper clearance and heat dissipation

Additional Features

  • Doors: Dual-door design with removable handles and rubber gaskets for dust and water protection, typically IP33–IP55 rated
  • Mounting: Wall-mounted or embedded with flanges for top or bottom cable entry
  • Internal Layout: Vertical mounting of components with adequate spacing for maintenance and safety

Notes

Exact dimensions can vary based on KVA rating, manufacturer, and project requirements. For precise measurements, it is recommended to refer to the manufacturer's technical drawings or purchase specifications, as tolerances of ±10% are common in LT distribution box fabrication . These dimensions ensure sufficient space for safe installation, maintenance, and compliance with electrical safety standards, while accommodating the three-level configuration of incomer, busbar, and outgoing circuits .

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