Proportion of cable tray accessories in the main materials of cable trays

Cable tray accessories typically account for a smaller proportion of the total material in a cable tray system, often ranging from 10% to 20% of the overall material volume, depending on system complexity and layout.

Main Materials of Cable Trays

Cable trays are commonly manufactured from galvanized steel, stainless steel, aluminum, or FRP (fiber-reinforced plastic), selected based on environmental conditions, mechanical strength, and corrosion resistance . Steel is often used for heavy-duty applications, aluminum for lightweight and corrosion-resistant installations, and FRP for highly corrosive environments . The main tray sections—ladder, perforated, solid bottom, basket, or channel—constitute the majority of the material in a system .

Cable Tray Accessories

Accessories include bends, tees, elbows, drop-outs, supports, clamps, brackets, splice plates, and expansion joints . These components are essential for routing, supporting, and connecting cable trays but generally use less material than the main tray sections. Accessories are often fabricated from the same material as the tray to maintain mechanical and corrosion properties, though some smaller fittings may use lighter gauge metal or plastic .

Proportion Estimation

• In typical installations, accessories represent approximately 10–20% of the total material used in a cable tray system.
• The proportion increases in complex layouts with multiple bends, vertical drops, or long spans requiring additional supports.
• Straight runs of tray with minimal routing will have a lower accessory-to-tray material ratio, closer to 10%, while highly branched or multi-level systems may approach 20% .

Practical Considerations

• Material selection for accessories should match the main tray to ensure uniform corrosion resistance and structural integrity .
• Cost allocation often reflects this proportion, with accessories contributing a smaller but significant portion of total system cost.
• Design planning should account for accessory density, especially in industrial or large-scale installations, to ensure proper support and compliance with standards like IEC 61537, NEMA VE 1, and NEC Article 392 . In summary, while the main tray sections dominate material usage, accessories are a critical 10–20% component that ensures proper routing, support, and system flexibility in cable tray installations.