Installation Method of Explosion-proof Distribution Box in China and Africa

Explosion-proof distribution boxes must be installed with precise alignment, certified enclosures, proper wiring, and adherence to local and international hazardous-area standards to ensure safety and operational reliability. Key Installation Steps1. Site Preparation and Foundation Before installation, ensure the control room or outdoor site is clean, safe, and ready for equipment placement.

Foundations must be level, stable, and capable of supporting the weight of high or low voltage distribution boxes. In China, compliance with GB3836 series standards is required, while in Africa, international standards like IECEx or ATEX may apply depending on the project. 2.

Equipment Inspection Upon delivery, inspect the boxes for deformations, paint loss, completeness of instruments, accessories, and manuals. Record any discrepancies before proceeding. This step ensures that the enclosure maintains its explosion-proof integrity.

3. Positioning and Alignment Place the boxes on the foundation steel according to the layout plan. Align the ends and use a reference line at two-thirds height from the bottom.

Adjust with shims (maximum three per spot) to achieve precise leveling. Neighboring boxes should have a top-level difference within 2mm, and the overall unevenness should not exceed 5mm. 4.

Securing and Wiring Fix the boxes using bolts and connect side panels with galvanized screws. Weld high and low voltage switchboxes to reserved angle steels. Cover cable layers with checkered steel plates and insulation.

Wiring must follow hazardous-area rules: use certified cable glands, maintain circuit segregation, and ensure terminations preserve enclosure integrity. 5. Certification and Protection Method Select the appropriate explosion-proof type based on zone classification: Ex d (flameproof): contains internal explosions.

Ex e (increased safety): reduces ignition sources. Ex p (purged/pressurized): prevents explosive atmospheres inside the enclosure. Ensure all enclosures are certified (GB3836, ATEX, IECEx) and that materials (stainless steel, coated aluminum, or certified polymers) are suitable for environmental conditions.

6.

Pre-

Operation Testing Conduct handover tests, pre-operation inspections, and trial operations. Verify thermal management, current carrying capacity, and mechanical integrity. Document all inspections and maintain logs for future maintenance.

7. Maintenance and Inspection Regular inspections are critical, typically every 6–12 months, or more frequently in corrosive or high-cycle environments. Check for dust accumulation, gasket integrity, and cable entry seals to prevent ignition hazards.

Regional Considerations

China: Follow GB3836 standards, ISO quality management systems, and local certifications (MA for mines, CCS for marine environments). Suppliers like Nanyang Yitong and CZ Electric provide modular, certified solutions for petrochemical and industrial projects. Africa: Projects often rely on IECEx or ATEX certifications.

Installation must consider local environmental factors such as high temperatures, humidity, and dust. Collaboration with certified engineers is recommended to ensure compliance with international safety standards.

Summary

Proper installation of explosion-proof distribution boxes involves foundation preparation, precise alignment, certified enclosures, correct wiring, and rigorous testing. Adhering to local and international standards, selecting the correct protection method, and maintaining regular inspections are essential to prevent accidents in hazardous environments and ensure long-term operational reliability.