Installation method of explosion-proof electrical distribution boxes in Finland
Explosion-proof electrical distribution boxes in Finland must be installed by qualified personnel following ATEX/IECEx standards, ensuring proper wiring, grounding, sealing, and placement in classified hazardous zones.
Zone Classification and Equipment Selection
Before installation, determine the hazardous area classification according to EN 60079-10-1 and EN 60079-10-2. Common zones include:
- Zone 1/2 for gases or vapors
- Zone 21/22 for combustible dusts Select distribution boxes certified for the specific zone, ensuring ATEX or IECEx certification and appropriate IP/NEMA ratings for environmental protection .
Installation Location and Mounting
- Install the box in a low-risk, collision-free area, away from heat sources and moisture-prone locations .
- Ensure the installation inclination does not exceed 5 degrees to maintain proper sealing .
- For outdoor installations, fit a rain cover to prevent water ingress and corrosion .
- Use stainless steel (AISI 304L or 316L), aluminium, or polyester enclosures depending on environmental conditions .
Wiring and Connections
- Turn off the main power supply before starting installation .
- Use cables rated for hazardous areas (EX or ATEX certified), resistant to flame, impact, and mechanical damage .
- Open the terminal chamber cover and connect incoming power, neutral, and earth wires to the designated terminals .
- Ensure internal and external grounding is properly connected to prevent electrical hazards .
- Tighten all terminal screws and secure cable glands to maintain the explosion-proof integrity .
Sealing and Maintenance
- Close the cover and secure it with fasteners, ensuring joint surfaces are undamaged to maintain explosion-proof protection .
- Apply anti-rust oil on joint surfaces after maintenance .
- Regularly inspect the box for component damage, corrosion, or loose connections .
Compliance and Testing
- Verify that all components comply with ATEX, IECEx, or local Finnish safety certificates .
- Conduct acceptance tests after installation, including checking wiring correctness, grounding, and functionality of safety systems .
- Only qualified personnel with appropriate certifications should perform installation and maintenance . By following these steps, explosion-proof distribution boxes can be safely installed in Finland, ensuring compliance with hazardous area regulations and extending the service life of the equipment.
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