The standard wall thickness for secondary distribution boxes in North Asia generally ranges from 1.5mm to 2.0mm for steel enclosures, with back panels often requiring 3.0mm for structural integrity.

Standard Thickness Guidelines

• Low-voltage distribution boxes: The wall thickness should not be less than 1.5mm, typically made from cold-rolled steel, stainless steel, or aluminum plates to ensure durability, heat resistance, and safety .
• Metal auxiliary poles or internal mounting structures: Usually 1.2mm minimum thickness .
• Larger boxes (≥600mm): Often require 2.0mm thick cold-rolled steel plates for the main body, while smaller boxes (<600mm) can use 1.5mm plates .
• Back panels: For enhanced structural support, especially in floor-standing or heavy-load boxes, the back panel thickness is typically 3.0mm .
• Reinforcements: If the box plate is thinner than 3mm, additional galvanized flat steel or angle steel reinforcements are welded or attached to maintain rigidity and seismic resistance .

Factors Affecting Thickness Requirements

1. Material Type: Steel and stainless steel require higher thickness than plastic or iron sheets to meet safety and durability standards .
2. Seismic and Environmental Considerations: In earthquake-prone regions, thicker walls or reinforced panels are recommended to prevent deformation or damage .
3. Temperature and Load: Boxes exposed to high temperatures or carrying heavy electrical equipment may require thicker walls to maintain structural integrity .
4. Local Certification: Compliance with country-specific certifications is essential, such as CCC mark in China, PSE in Japan, and KC certification in South Korea, which may influence design and thickness requirements .

Summary

For secondary distribution boxes in North Asia, the typical national standard thickness is:

• Box walls: 1.5–2.0mm
• Back panels: 3.0mm
• Auxiliary metal components: 1.2mm or more These standards ensure electrical safety, mechanical strength, and compliance with local regulations, while additional reinforcements may be applied depending on box size, material, and environmental conditions .