The core of determining if the material of power distribution equipment is qualified is whether it meets the actual requirements of the operating environment, such as protection, corrosion resistance, and mechanical strength. The following are key standards for qualification judgment based on different scenarios:
1. Humid, High Salt Spray, or Coastal Environments (e.g., seaside factories, port facilities)
Qualified Standards: The material should be 304 or 316 stainless steel, with a thickness ≥1.2mm.
The surface should be brushed or passivated, and the welds should have no oxidation residue after pickling.
Protection level ≥IP55, with a salt spray corrosion test report.
Unqualified Characteristics: Using ordinary powder-coated steel plates or thin-walled stainless steel (<1.0mm) is prone to rust and sealing failure.
2. Industrial Dust, Chemical Plant, or Mining Environments
Qualified Standards: Hot-dip galvanized steel plates (≥1.5mm) or 304 stainless steel should be used.
The cabinet structure is well-sealed, and the inlet and outlet ports are equipped with waterproof and dustproof connectors.
It possesses chemical corrosion resistance, especially in acidic and alkaline gas environments, requiring weather resistance verification.
Unacceptable: Use of ungalvanized iron sheet or inferior coating; paint peeling and perforation will occur after long-term operation.
3. General Outdoor Scenarios (e.g., street light control boxes, community distribution cabinets)
Acceptable Standards: Flame-retardant PC engineering plastic or galvanized sheet + powder coating can be used.
PC material must reach V0 flame retardancy rating, resist UV aging, and not easily discolor or crack.
Metal materials must be paired with high-quality sealing strips, with a protection level ≥ IP44.
Unacceptable: Use of ABS plastic or non-flame-retardant materials; deformation and high fire risk after exposure to sun and rain.
4. Ordinary Indoor Dry Environments (e.g., office buildings, residential electrical rooms)
Acceptable Standards:
Cold-rolled steel sheet + electrostatic spraying is sufficient; thickness ≥ 1.5mm. The surface coating is uniform, without peeling or scratches, and the grounding continuity is ≤0.1Ω.
Non-compliant: The sheet material is too thin (<1.2mm), the coating adhesion is poor, and it is prone to moisture and rust.
5. High-temperature, high-heat, or data center scenarios with high heat dissipation requirements:
Compliance Standard: Aluminum alloy is recommended due to its high thermal conductivity, which facilitates heat dissipation.
The structural design optimizes ventilation channels to avoid localized overheating.
Non-compliant: Using low thermal conductivity materials (such as plastic) without heat dissipation holes can lead to overheating and damage to components.
6. Explosion-proof or high-safety-level locations (such as oil depots and pharmaceutical factories:
Compliance Standard: High-strength carbon steel or stainless steel must be used, with explosion-proof certification.
The enclosure is firmly welded with tight seams to prevent spark leakage.
Non-compliant: Loose structure, lack of explosion-proof markings, posing a significant safety hazard.
