Cable trays for flat panel lights typically range from 50 mm to 150 mm in width, depending on the number and type of cables.

Standard Widths

Cable trays are manufactured in a variety of standard widths to accommodate different cable volumes. For small installations like flat panel lighting, narrow trays between 50 mm and 150 mm are usually sufficient . The width refers to the inside usable space, not the total external dimension, which is slightly larger due to side rail thickness .

Sizing Considerations

1. Cable Quantity and Diameter: Measure the total width of all cables that will run side by side. For a typical flat panel light, this may include a power cable and possibly a control or dimming cable.
2. Spacing and Airflow: Maintain spacing between cables to allow heat dissipation. A tray should not be filled beyond 40% of its capacity to prevent overheating .
3. Future Expansion: Add a spare capacity factor (commonly 20%) to accommodate additional cables in the future .
4. Tray Type: Ladder, perforated, or wire mesh trays may have slightly different usable widths, so select a type compatible with your installation environment .

Practical Example

For a single flat panel light with a small power cable (e.g., 2.5 mm²), a 50 mm wide tray is usually adequate. If multiple lights are daisy-chained or if additional control cables are included, a 100 mm or 150 mm tray may be more appropriate to maintain proper spacing and airflow .

Summary

• Minimum width: 50 mm for a single light with minimal cabling
• Typical width: 100–150 mm for multiple lights or additional control wiring
• Safety guideline: Fill tray to no more than 40% of its capacity and allow for future expansion Selecting the correct width ensures safe operation, compliance with electrical standards, and ease of installation.