Cable tray supports typically accommodate tray widths ranging from 6 inches to 48 inches, depending on the application and tray type.

Standard Widths

Cable tray widths are standardized to match the number and size of cables being supported. Common nominal inside widths include 6, 9, 12, 18, 24, 30, 36, 42, and 48 inches for ladder-type trays, with the outside width slightly larger due to side rail thickness . For smaller installations, such as control or instrumentation cables, widths as narrow as 50 mm (approximately 2 inches) are used, while large industrial or factory installations may require widths up to 900 mm (approximately 36 inches) .

Factors Affecting Width Selection

• Cable Volume: Wider trays allow more cables to be laid side-by-side, reducing overcrowding and heat buildup .
• Rung Spacing: Wider trays often require stronger rungs or closer spacing to maintain structural integrity .
• Tray Type: Ladder, perforated, channel, and wire mesh trays have different mechanical properties, so the same nominal width may perform differently depending on the design .
• Future Expansion: It is recommended to fill trays to no more than 40% of their capacity to allow for additional cables and proper airflow .

Practical Considerations

When designing or installing cable tray supports, always verify the manufacturer's specifications for load capacity and recommended span. Wider trays may require additional support points to prevent deflection, especially when carrying heavy power cables . For small-diameter control cables, narrower trays with closer rung spacing are sufficient, while large power cables benefit from wider trays with 9-inch or larger rung spacing . By selecting the correct width, you ensure code compliance, safe cable installation, and long-term expandability .