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Wires and cables in the same cable tray

ODN and passive infrastructure knowledge brief Published 06 Jun 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.

Power, signal, and communication cables can share a cable tray only if proper separation and installation rules are followed according to NEC Article 392.NEC Guidelines and Separation Requirements

Cable trays are designed to support electrical, signal, and communication cables, but not other services like water, gas, or steam . According to NEC 392, different types of cables can be installed in the same tray, but separation may be required depending on voltage ratings, signal type, or potential interference . For example, conductors operating over 600 volts must be separated from those operating at 600 volts or less, either by barriers or physical spacing . Even when all conductors operate at the same voltage, separation may be recommended to prevent interference or overheating.

Types of Cables Commonly Used
  • Type TC (Tray Cable): Used for power and control circuits, rated for 600 volts, suitable for industrial and commercial installations .
  • Type ITC (Instrumentation Tray Cable): Used for instrumentation and control, available in shielded or unshielded forms .
  • Type MC (Metal Clad Cable): Suitable for power, lighting, and control circuits, can be installed indoors or outdoors, and may include optical fibers . Each cable type has specific installation requirements, including support intervals, securing methods, and fill limits . Overfilling a tray can lead to overheating and maintenance difficulties .
Best Practices
  • Use barriers or dividers when mixing high-voltage and low-voltage cables to prevent electrical interference .
  • Maintain proper tray fill according to NEC 392 to ensure ventilation and prevent overheating .
  • Secure cables at regular intervals (typically every six feet for TC and MC cables) to maintain mechanical stability .
  • Consider ladder trays for power cables to maximize airflow and cooling, and solid-bottom trays for sensitive signal cables to reduce EMI .
Summary

While it is possible to place multiple types of cables in the same tray, compliance with NEC separation rules, proper fill, and secure installation is essential. Using barriers or separate sections within the tray is recommended when mixing power and signal cables to ensure safety, reduce interference, and maintain long-term reliability .

Wires and cables in the same cable tray - GESTIONVAL ODN INFRASTRUCTURE S.L. [PDF]

Wires and cables in the same cable tray

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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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