Installation of Explosion-proof Base for Distribution Box

Explosion-proof distribution boxes must be installed on a solid, level foundation with precise alignment, secure fastening, proper grounding, and adherence to national and international safety standards. Foundation and Site PreparationExplosion-proof distribution boxes require a stable and level foundation, typically made of reinforced concrete or steel structures, capable of supporting the weight of the box and associated equipment without deformation. Before installation, the control room or site should be fully prepared, clean, and free of obstructions, with all interior construction completed.

Foundation acceptance should be performed to ensure it meets design specifications and tolerances.

Alignment and Mounting

Boxes should be aligned accurately according to the layout plan. This involves: Aligning the ends of the boxes and using a reference line at two-thirds height from the bottom for consistent leveling. Adjusting with shims (maximum three per spot, typically 0.

5mm each) to achieve precise leveling. Ensuring the top level difference between neighboring boxes does not exceed 2mm, with total unevenness within 5mm. Fixing the boxes securely using bolts and connecting side panels with galvanized screws.

Welding high and low voltage switchboxes to reserved angle steels for additional stability.

Wiring and Electrical Considerations

Wiring must be performed by qualified electricians familiar with hazardous area requirements. Key points include: Using cables and components rated for explosion-proof applications (EX or ATEX certified) and resistant to flame, impact, and mechanical damage. Connecting incoming power, neutral, and earth wires to the designated terminals, ensuring proper grounding to prevent electrical hazards.

Maintaining electrical clearance and creepage distances according to component specifications. Organizing wiring neatly, bundling with nylon tape, and using appropriate fasteners and casings for secondary wiring.

Safety and Compliance

Installation must comply with national standards (e.g., GB7251 in China) and international standards (IECEx, ATEX, NEC Class I/II). Special attention should be given to: Sealing conduits to prevent gas or dust ingress. Ensuring the enclosure can withstand internal explosions without fragmentation.

Verifying that all certification documents are site-specific and installation personnel are trained to interpret hazardous area classifications.

Summary

The installation basis for explosion-proof distribution boxes combines structural integrity, precise alignment, secure mounting, proper wiring, grounding, and strict adherence to safety standards. Following these guidelines ensures the boxes function safely in hazardous environments, protecting both personnel and equipment from potential explosions.