Galvanized flat steel is placed in cable trays

Galvanized flat steel can be safely placed inside cable trays, provided it meets corrosion protection standards and is properly installed.Material and Corrosion ProtectionCable trays are commonly made...

Galvanized flat steel is placed in cable trays

Galvanized flat steel can be safely placed inside cable trays, provided it meets corrosion protection standards and is properly installed.

Material and Corrosion Protection

Cable trays are commonly made from galvanized steel, stainless steel, aluminum, or glass-fiber reinforced plastic, with galvanized steel being widely used for its cost-effectiveness and corrosion resistance . Galvanization protects steel by forming a zinc oxide layer that acts as a sacrificial barrier, slowing corrosion even if the steel surface is scratched . There are two main types:

  • Pre-galvanized steel: Coated at the mill before fabrication, suitable for general indoor applications .
  • Hot-dip galvanized steel: Coated after fabrication, providing thicker zinc protection and better durability in harsh or outdoor environments . When galvanized steel is cut to fit inside a tray, the exposed edges should be treated with a zinc-rich compound to maintain corrosion resistance .

Installation Considerations

  • Ensure the flat steel does not obstruct cable routing or violate the minimum bend radius of cables .
  • Use proper supports or spacers to prevent direct contact that could cause abrasion or galvanic corrosion if dissimilar metals are present .
  • Covers and splice plates for steel trays should also be hot-dip galvanized to maintain uniform protection .

Standards and Compliance

  • Follow ASTM A653 for pre-galvanized steel and ASTM A123 for hot-dip galvanized steel .
  • Installation should comply with NEMA VE 1 and VE 2 guidelines for metallic cable tray systems, ensuring mechanical support, grounding, and safety .

Summary

Placing galvanized flat steel inside a cable tray is acceptable if the steel is properly galvanized, edges are protected, and installation follows mechanical and electrical standards. This ensures long-term corrosion resistance, safe cable management, and compliance with industry standards .

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