The support spacing for cable trays typically ranges from 4 to 6 feet, depending on the type of tray and the weight of the cables it carries.

General Guidelines for Support Spacing

1. Horizontal Runs:
   • The National Electrical Code (NEC) recommends that cable trays be supported at intervals not exceeding 5 feet for horizontal runs. This ensures adequate support for the weight of the cables and prevents sagging .
   • For ladder-type cable trays, the rungs should not be spaced more than 9 inches apart to provide sufficient support .
2. Vertical Runs:
   • For vertical cable tray installations, supports should be fixed to the building structure with a spacing preferably less than 2 meters (approximately 6.5 feet) .
3. Specific Spacing Recommendations:
   • The typical support span for horizontal sections should range from 1.5 meters to 3 meters (approximately 5 to 10 feet), allowing for easy access and maintenance .
   • At corners or bends in cable trays, it is necessary to install one hanger on each side, arranged symmetrically, with the distance between hangers typically not exceeding 1.5 meters .

Factors Influencing Support Spacing

• Cable Type and Weight: The type of cables being installed and their weight will influence the required support spacing. Heavier cables may necessitate closer support intervals to prevent sagging or damage.
• Environmental Conditions: Consideration of external factors such as wind or seismic activity may also affect support requirements, necessitating additional supports in certain conditions. By following these guidelines, you can ensure that your cable tray installation is safe, functional, and compliant with relevant standards. Always consult the manufacturer's specifications and local codes for the most accurate and applicable information.