Dimensions of galvanized fireproof cable trays

Galvanized fireproof cable trays are available in standard widths from 50 mm to 600 mm, depths from 25 mm to 150 mm, and lengths typically of 2–3 meters, with material thickness varying by duty class.

Standard Dimensions

Width: The nominal inside usable width ranges from 50 mm to 600 mm, depending on the tray type and application. Ladder trays for heavy power cables often use wider trays (300–600 mm), while channel or small control trays may be narrower (50–150 mm) to suit limited cable runs. Depth (Side Rail Height): Depths typically range from 25 mm to 150 mm, controlling vertical stacking capacity and heat dissipation.

Ladder trays generally have higher side rails for heavy cable loads, while perforated or channel trays have shallower depths for smaller cable quantities. Length: Standard tray sections are usually 2 meters or 3 meters long, allowing for modular assembly in the field. Custom lengths can be fabricated for specific installations.

Material Thickness: Thickness varies by duty class: Light duty: 1. 0–1. 5 mmMedium duty: 1.

5–2. 0 mmHeavy duty: 2. 0–3.

0 mm The thickness affects structural load capacity and corrosion resistance, especially for galvanized trays. Galvanization TypesElectro-galvanized (pre-galv): Thin zinc coating, suitable for indoor or low-corrosion environments. Hot-dip galvanized: Thicker zinc coating, providing superior corrosion resistance for wet or industrial environments.

The protective zinc layer forms a patina over time, enhancing fire and corrosion protection.

Tray Types and Considerations

Ladder trays: Open rungs for maximum airflow and heat dissipation; ideal for heavy power cables. Perforated trays: Continuous bottom support with ventilation holes; suitable for medium loads and uniform cable support. Channel trays: Compact, narrow trays for small cable runs or control wiring; not recommended for large power cables.

Summary

When selecting galvanized fireproof cable trays, consider width, depth, length, material thickness, and galvanization type based on cable load, heat dissipation, and environmental conditions. Standardized dimensions ensure compliance with NEC, NEMA, and IEC requirements while allowing modular installation and future expansion.