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Galvanizing of cable trays is divided into

Galvanizing of cable trays is divided into

HOME / Galvanizing of cable trays is divided into

Galvanizing of cable trays is divided into - BENNIE OPTICAL [PDF]

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Galvanizing of cable trays is primarily divided into electro-galvanizing (cold galvanizing) and hot-dip galvanizing (HDG), with pre-galvanized steel as a preliminary option.

Types of Galvanized Cable Trays

  1. Pre-Galvanized Cable Trays These trays are made from steel that has been galvanized before fabrication. The zinc coating is applied to the steel sheet prior to forming the tray, providing basic corrosion protection suitable for indoor or less harsh environments. Pre-galvanized trays are commonly used in industrial and commercial applications where moderate protection is sufficient .
  2. Electro-Galvanized (Cold Galvanized) Cable Trays In this process, a thin layer of zinc is deposited onto the steel surface through electrolysis. The coating is bright, uniform, and relatively thin (typically ≥12µm), offering limited corrosion resistance. Electro-galvanized trays are suitable for indoor use but are not recommended for marine or highly humid environments due to the risk of rapid rusting .
  3. Hot-Dip Galvanized (HDG) Cable Trays Hot-dip galvanizing involves submerging the steel tray into molten zinc, forming a thick zinc-iron alloy layer topped with pure zinc. This method provides superior corrosion resistance, excellent adhesion, and durability, making it ideal for outdoor, coastal, or industrial environments. The typical coating thickness is around 39–45µm, corresponding to a zinc mass of 275–325g/m², depending on steel thickness . HDG trays are preferred for long-term exposure to harsh conditions.

Additional Considerations

  • Corrosion Protection: The thicker the zinc layer, the better the corrosion resistance. Hot-dip galvanizing provides sacrificial protection, meaning the zinc corrodes first, protecting the steel underneath .
  • Installation Benefits: Galvanized trays, especially HDG, reduce maintenance, allow complex architectural designs, and provide smooth edges to prevent cable damage .
  • Customization: Manufacturers can supply matching accessories such as elbows, tees, and brackets, and can customize trays based on site conditions and environmental requirements . In summary, galvanizing of cable trays is divided into pre-galvanized, electro-galvanized (cold), and hot-dip galvanized (HDG) types, each offering different levels of corrosion protection and suitability for specific environments. The choice depends on the installation location, exposure conditions, and desired durability.
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