In vertical cable trays, cables must be securely fastened to the tray's transverse members using approved ties or fasteners to prevent sagging, maintain spacing, and ensure code compliance.Key Pr...
In vertical cable trays, cables must be securely fastened to the tray's transverse members using approved ties or fasteners to prevent sagging, maintain spacing, and ensure code compliance.
1. Fasten to Transverse Members: In vertical or angled tray runs, cables should be tied to the tray's rungs or transverse members. This prevents cables from hanging away from the tray and reduces the risk of mechanical damage or strain on terminations .
2. Use Approved Cable Ties: Only use cable ties that are listed and approved for cable tray applications. Standard plastic ties may not meet fire-safety standards, especially in plenum spaces. For outdoor installations, UV-resistant ties are recommended to prevent degradation .
3. Maintain Proper Spacing: Ties help maintain spacing between cables, which improves heat dissipation and allows higher ampacities. Smaller-diameter, flexible cables require more frequent tie points than large, stiff cables .
4. Avoid Overtightening: Do not overtighten ties, as this can damage cable jackets and lead to long-term reliability issues .
5. Strain Relief at Transitions: At points where cables enter raceways or connect to equipment, secure the cables and provide strain relief to protect terminations from mechanical stress .
6. Tie Frequency: For vertical runs, tie cables at intervals appropriate to their size and flexibility. For example, MI cables with fire-resistant ratings should be supported every three feet using stainless steel ties .
7. Consider Barriers for Separation: In installations where power and low-energy signal cables share a tray, ties or permanent barriers can maintain separation and prevent interference .
Securing cables in vertical cable trays involves tying cables to transverse members, using approved ties, maintaining proper spacing, and providing strain relief at transitions. Following these practices ensures mechanical stability, heat dissipation, and compliance with NEC Article 392 while protecting cable integrity and system reliability .
NEMA Standards Publication VE 2-2006 Cable Tray Installation Guidelines Published by: National Electrical Manufacturers
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