Key Points and Considerations for Purchasing Galvanized Cable Trays

1. Confirm Environmental Corrosion Level and Process Requirements

• Highly corrosive environments (coastal areas, chemical zones, outdoor installations):
   
  Must use hot‑dip galvanized (HDG) cable trays. Ensure the zinc coating meets C5‑level corrosion resistance (marine environment), with a coating thickness typically ≥ 65 μm.
• Indoor or dry environments:
   
  Cost‑effective electro‑galvanized (cold galvanized) trays may be used.
• Fire‑protection required areas:
   
  Use fire‑resistant cable trays made of steel or non‑combustible flame‑retardant materials, or install fireproof linings inside the trays.

2. Verify Key Quality Parameters

• Zinc coating thickness:
   
  Focus not only on nominal values but also on average thickness and minimum local thickness, as thin spots are prone to rust.
   
  National standard: average single‑sided zinc coating on the main body ≥ 65 μm.
• Sheet thickness:
   
  Directly affects load‑bearing capacity and must meet design specifications.
   
  Example: for tray width ≥ 800 mm, sheet thickness is recommended to be ≥ 2.2 mm.
• Anti‑corrosion protection at cuts and joints:
   
  If the zinc coating is damaged during cutting, drilling, or assembly, touch‑up zinc paint or anti‑corrosion treatment must be applied to prevent premature corrosion.

3. Supplier Qualification and Service Capability

• Verify that the supplier provides complete documentation:
   
  product certificates, inspection reports, and material test certificates.
• Evaluate customization capabilities:
   
  non‑standard elbows, reducers, tees, and special sizes, as well as on‑time delivery performance.
• Ensure a complete set of matching accessories:
   
  elbows, tees, connectors, supports, and hangers, to avoid on‑site secondary processing that damages the anti‑corrosion layer.