For a 95 mm² cable, a standard cable tray width of 150–200 mm is typically recommended, depending on the number of cables and fill ratio.

Determining Tray Size

To select the correct cable tray size, you need to calculate the total cross-sectional area of all cables and apply a fill factor to ensure proper ventilation and heat dissipation. The formula is: Required Tray Area = Total Cable Area × Fill Factor

• Total Cable Area: Sum of the cross-sectional areas of all cables. For a single 95 mm² cable, this is 95 mm².
• Fill Factor: Typically 1.2 (20% extra space) to allow for heat dissipation and future cable additions . For example, a single 95 mm² cable with a 20% safety margin requires approximately 114 mm² of tray cross-sectional area.

Standard Tray Widths

Cable trays are manufactured in standard widths ranging from 50 mm to 900 mm, with common sizes for power cables being 100 mm, 150 mm, 200 mm, 300 mm, and 450 mm . The final width depends on:

• Number of cables to be installed side-by-side
• Single-layer vs. multi-layer arrangement
• Required spacing for heat dissipation (typically 5 mm between cables)
• Future expansion (recommended 20–30% spare capacity) For a single 95 mm² cable, a 150 mm wide tray is generally sufficient for one or two cables in a single layer. If multiple 95 mm² cables are installed, a 200 mm or wider tray may be required to maintain the recommended 40% fill ratio for power cables .

Depth Considerations

Tray depth (vertical height) is also important to prevent cable spillage and allow proper airflow. Standard depths include 50 mm, 75 mm, 100 mm, and 150 mm. For a single 95 mm² cable, a 50–75 mm deep tray is usually adequate, but deeper trays are recommended for multiple layers or larger bundles .

Summary Recommendation

• Single 95 mm² cable: 150 mm width × 50–75 mm depth
• Two or more 95 mm² cables: 200 mm width × 75–100 mm depth
• Maintain 40% fill ratio for power cables
• Include 20% spare capacity for future expansion
• Ensure 5 mm spacing between cables for heat dissipation Using these guidelines ensures compliance with NEC and IEC standards, prevents overheating, and allows for safe, maintainable cable installations .