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Cable types that do not require cable trays

ODN and passive infrastructure knowledge brief Published 25 Jul 2024

Prepared for preliminary research by the GESTIONVAL ODN knowledge desk. Confirm network topology, split ratio, box or cabinet capacity, joint closure rating and loss budget against current standards and product documentation.

Certain cables, such as Type TC-ER (Tray Cable – Exposed Run) and outdoor messenger-supported cables, can be installed without continuous cable trays under specific conditions.Cables That Can Be Installed Without Cable Trays
  1. Type TC-ER (Tray Cable – Exposed Run)
    • These are power and control tray cables designed for short transitions between cable trays and equipment.
    • They can be installed without continuous tray support for distances up to six feet, provided they are not subject to physical damage and are secured at intervals not exceeding six feet.
    • This allows flexibility for connecting equipment directly to a tray system without requiring a full tray run .
  2. Outdoor Messenger-Supported TC Cables
    • Type TC cables can be installed outdoors supported by a messenger wire instead of a tray.
    • This method is suitable for aerial runs where physical protection is provided by the messenger support rather than a tray .
  3. Direct Burial Cables
    • Some TC cables, if specifically identified for direct burial, can be installed underground without a tray.
    • These installations must comply with NEC requirements for burial depth, protection, and environmental conditions .
  4. Certain Communication and Instrumentation Cables
    • Low-voltage communication cables, optical fiber cables, and instrumentation cables may be installed without trays if they are protected from physical damage and meet NEC spacing and support requirements.
    • For example, short runs under raised floors or within walls may not require trays if proper support and separation from power cables are maintained .
Key Considerations
  • Physical Protection: Cables not in trays must be protected from mechanical damage.
  • Support Intervals: Even when trays are not used, cables must be supported at intervals specified by the NEC or manufacturer.
  • Separation Requirements: Power, signal, and communication cables must maintain proper separation to prevent interference.
  • Compliance: Always verify that the cable type and installation method comply with NEC Articles 336 (TC), 334 (MC), 727 (ITC), and other relevant sections . In summary, while most industrial and commercial cables are installed in trays for support, heat dissipation, and organization, Type TC-ER, messenger-supported outdoor cables, direct burial cables, and certain low-voltage communication or instrumentation cables can be installed without cable trays when NEC and manufacturer guidelines are followed.

Cable types that do not require cable trays - GESTIONVAL ODN INFRASTRUCTURE S.L. [PDF]

Cable types that do not require cable trays

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Technical note

This reference is intended for preliminary ODN and passive infrastructure research. Topology, split ratio, box or cabinet capacity, closure rating, cable type, test limits and applicable standards must be verified for the specific project.

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