Aluminum, galvanized steel, stainless steel, or fiber-reinforced plastic (FRP) are commonly used for ground-level cable trays, chosen based on environmental exposure, load requirements, and corrosion resistance.
1. Aluminum: Lightweight and corrosion-resistant, aluminum is suitable for many indoor and outdoor applications. Its natural oxide layer protects against atmospheric corrosion, making it ideal for areas with moderate moisture exposure. Aluminum trays are easy to handle and install, but care must be taken when using bare copper grounding conductors to avoid electrolytic corrosion .
2. Steel (Hot-Dip Galvanized or Pre-Galvanized): Steel provides high mechanical strength for heavy-duty applications. Hot-dip galvanized steel offers excellent corrosion resistance for outdoor or industrial environments, while pre-galvanized steel is more economical for indoor use. Steel trays are durable but heavier than aluminum and may require additional grounding measures .
3. Stainless Steel: For harsh or highly corrosive environments, stainless steel (e.g., AISI 316L) is preferred. It resists pitting, stress corrosion, and chemical exposure, making it suitable for coastal areas, chemical plants, or locations with high moisture .
4. Fiber-Reinforced Plastic (FRP): FRP trays are non-metallic, corrosion-resistant, and electrically insulating. They are ideal for environments where voltage isolation is required or where metallic trays may corrode. FRP is lightweight and strong, but may have lower mechanical load capacity compared to steel .
Selecting the right material ensures compliance with NEC standards, mechanical stability, corrosion resistance, and safe grounding for ground-level cable tray installations .
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