For a 6-meter (approximately 20 feet) cable tray, supports should generally be placed every 1.5 to 3 meters, depending on tray type, load, and manufacturer specifications.

Recommended Support Spacing

For standard horizontal cable trays, the typical support span ranges from 1.5 meters to 3 meters (5 to 10 feet) to prevent sagging and maintain structural integrity . Heavy-duty or long-span trays may allow supports up to 6 meters apart if the tray and cable load are within manufacturer specifications . Ladder-type trays, commonly used for heavy power cables, often require supports at 4 to 6 feet intervals to comply with NEC guidelines .

Factors Affecting Support Spacing

• Tray Type: Ladder, ventilated, or solid-bottom trays have different load capacities; ladder trays may need closer supports for heavy cables .
• Cable Load: Heavier cables or high-density installations require shorter spans to prevent excessive deflection .
• Environmental Conditions: Outdoor installations, high wind, or seismic areas may require closer support spacing .
• Manufacturer Guidelines: Always follow the tray manufacturer's load chart and installation instructions, as they account for material strength and maximum allowable deflection .

Practical Installation Tips

• Place supports at tray ends, corners, and T-junctions to maintain stability .
• For straight runs, one support every 2 to 3 meters is typical for medium-duty trays, while heavy-duty trays may extend to 6 meters if approved by the manufacturer .
• Use splice plates at support points to minimize stress and maintain alignment .
• Ensure level installation to avoid uneven stress on cables and tray sections . By adhering to these guidelines, a 6-meter cable tray can be safely supported, minimizing sag, mechanical stress, and potential damage to the cables.