ROUND HOLE PERFORATED SHEET

A Pre G.I. (Pre-Galvanized Iron) Cable Tray is a support system for managing and protecting electrical cables, distinguished by its corrosion-resistant zinc coating that is applied to the raw steel before the tray is manufactured.

Key Features and Construction

• Material: Constructed from steel sheet that has already been coated with zinc at the mill.

• Coating Process (Pre-Galvanization): The steel coil or sheet is passed through a molten zinc bath, or coated using an electro-galvanization process, before the tray components are cut, punched, and formed.

  • This is also commonly referred to as mill-galvanized or G90 steel.

• Corrosion Resistance: The zinc coating provides good protection against rust in dry, indoor, and less aggressive environments.

• Structure: Like other trays, it can be manufactured in different styles, most commonly:

  • Perforated/Ventilated: Features holes in the base for cable cooling and fastening.

  • Ladder: Has rungs for maximum airflow and is suited for heavy loads.

• Cut Edge Vulnerability: The major limitation is that the cut edges (where the steel is sheared, punched, or slit) have no zinc coating, leaving the base steel exposed. However, the zinc adjacent to the cut tends to provide some sacrificial protection to the exposed edges.

Primary Purpose and Applications

Pre G.I. cable trays are a cost-effective choice for general-purpose applications where the environment is stable and non-corrosive.

• Cost-Effectiveness: They are typically less expensive than trays finished with Hot-Dip Galvanization or Stainless Steel.

• Indoor Use: Predominantly used in dry, indoor, non-corrosive environments such as:

  • Office buildings and commercial facilities.

  • Data centers and clean rooms (where hot-dip residue is unwanted).

  • Light manufacturing areas.

• Protection: Provides reliable mechanical protection and structural support for medium-to-light cable loads.

In summary, a Pre G.I. cable tray offers good corrosion protection for standard indoor applications at a lower cost than post-fabrication coatings, but it is not recommended for harsh, outdoor, or highly corrosive industrial environments.