Specifications and dimensions of iron electrical distribution boxes

Iron electrical distribution boxes are typically made of 1.2–2 mm thick steel, wall-mounted, with IP55–IP65 protection, and dimensions ranging from 300×200×150 mm to larger custom sizes.

Material and Construction

Metal distribution boxes are generally fabricated from cold-rolled or galvanized steel plates with thicknesses ranging from 1.2 mm to 2 mm for the body, and 2–3 mm for back panels in power distribution cabinets . They are painted in RAL 7035 gray for corrosion resistance and may include rubber gaskets on doors to ensure watertightness . Doors often feature quarter-turn closures or Godrej-type 3-position locks for security, with hinges concealed from the outside .

Protection and Standards

• IP Rating: Commonly IP55 or IP65, providing protection against dust and water jets, suitable for outdoor installation .
• Earthing: Boxes include solid earthing points on either side to ensure safety .
• Compliance: Designed according to low-tension directives and national electrical standards, with type-test certificates required for IP protection, impulse, and short-circuit tests .

Dimensions and Mounting

• Standard wall-mounted size: 300×200×150 mm, though larger or custom dimensions are possible .
• Installation height: Fixed boxes are typically installed 1.3–1.5 m above ground, while mobile boxes can be 0.6–1.5 m .
• Mounting: Wall-mounted with welded mounting lugs (40×4 mm, 10 cm length) for secure attachment .
• Internal layout: Includes a mounting plate for electrical components, with reserved openings for incoming and outgoing wires equipped with Class 3 sealing .

Mechanical and Functional Features

• Reinforced body: Ensures structural integrity and supports internal bus bars and MCCBs .
• Roof design: Slightly slanted with a 50 mm overhang to prevent water ingress .
• Doors and panels: Steel doors and panels are at least 2 mm thick, back panels 3 mm, ensuring durability .
• Component accommodation: Designed to house bus bars, MCCBs, and outgoing feeders, with adequate clearance from the box body .

Summary

Iron electrical distribution boxes are robust, secure, and suitable for both indoor and outdoor applications. They combine steel construction, IP-rated protection, reinforced mechanical design, and standardized mounting dimensions to ensure safe and compliant electrical distribution . Custom sizes and configurations are available depending on the number of modules and specific installation requirements.