For 6 sq. mm cables, standard ladder or perforated cable trays with widths of 100–150 mm and depths of 25–50 mm are typically suitable, following NEC fill guidelines.

Cable Tray Type

• Ladder trays are preferred for power cables like 6 sq. mm, as they allow better ventilation and heat dissipation.
• Perforated trays can also be used for smaller bundles, providing moderate support and airflow.
• Solid-bottom trays are generally less efficient for heat dissipation and reduce allowable cable fill by approximately 22% compared to ladder trays .

Tray Width and Depth

• Width: For small power or control cables such as 6 sq. mm, 100–150 mm nominal inside width is commonly used, sufficient for single or small bundles .
• Depth (side rail height): 25–50 mm is adequate for lightweight cables, ensuring proper containment and support .
• Wider trays may be required if multiple layers or future expansion is anticipated.

Cable Fill and Installation

• Single-layer installation: The sum of cable diameters should not exceed the tray's usable width for ladder trays; for solid-bottom trays, the total cable area should not exceed 90% of the tray width .
• Fill ratio: NEC recommends maximum 50% fill for power cables in ladder trays to allow heat dissipation and prevent overheating .
• Future expansion: Reserve 25–40% spare capacity to accommodate additional cables without replacing the tray .

Material and Standards

• Trays are typically made of galvanized steel, stainless steel, or aluminum, depending on environmental conditions.
• Ensure compliance with NEC, NEMA, or IEC standards for voltage rating, mechanical strength, and fire safety .

Summary Recommendation

For 6 sq. mm cables:

• Tray type: Ladder or perforated
• Width: 100–150 mm
• Depth: 25–50 mm
• Fill: ≤50% of usable area for ladder trays, ≤40% for solid-bottom trays
• Material: Galvanized steel or aluminum, code-compliant This configuration ensures safe, ventilated, and code-compliant installation while allowing for future cable additions.