Standard basis for the thickness of distribution box body

The standard thickness for low-voltage distribution box bodies is generally 1.5 mm or more, depending on material, size, and application.National Standard RequirementsAccording to national regulations, the wall thickness of a low-voltage distribution box should not be less than 1.5 mm, while metal auxiliary poles should be at least 1.2 mm thick. This ensures safety, structural integrity, and resistance to mechanical stress or seismic events . Thinner boxes may pose hazards when carrying electrical equipment or under earthquake conditions.Factors Affecting Thickness SelectionType and Purpose of the Box:Lighting distribution boxes: For boxes ≥ 600 mm, 2.0 mm cold-rolled steel is recommended; for smaller boxes, 1.5 mm is sufficient .Power distribution boxes: Must withstand higher electrodynamic and mechanical stresses; thickness is usually ≥ 1.5 mm, with larger or high-capacity boxes requiring 2.0 mm or more .Power distribution cabinets: Centralized control of large electrical loads requires a minimum of 2.0 mm to maintain structural integrity and protection performance .Box Size and Weight:Width 500–800 mm: minimum 1.2 mmWidth ≥ 800 mm: minimum 1.5 mmHousehold boxes with semi-perimeter ≥ 900 mm: minimum 1.5 mm; < 900 mm: minimum 1.2 mm Material: Steel, stainless steel, and aluminum require higher thickness than iron or plastic boxes to ensure durability and safety .Environmental Conditions: Outdoor, humid, or corrosive environments require thicker sheet metal and anti-corrosion treatments such as galvanization or protective coatings .Seismic and Mechanical Considerations: Boxes must resist deformation and maintain safety during earthquakes or mechanical impacts .Industry PracticesFor outdoor low-voltage distribution boxes, 2 mm GI sheet steel is commonly used, with reinforced channels and proper earthing points to meet IP-55 protection standards . Compliance with IEC 61439 / EN 61439 ensures that the assembly is safe, reliable, and meets legal and technical requirements .SummaryWhile the minimum standard thickness is 1.5 mm, the actual thickness should be selected based on box type, size, material, load, environmental conditions, and safety requirements. Larger, outdoor, or high-capacity boxes typically require 2 mm or more to ensure structural integrity and compliance with national and international standards .