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Cable tray communication cable

Optical network knowledge brief Published 07 Jun 2023

Prepared for preliminary research by the COETZER OPTICAL knowledge desk. Confirm compatibility, loss budgets and installation requirements against current standards and product documentation.

Communication cables in cable trays are specialized cables designed for data, telecommunication, and signal transmission, installed according to NEC standards to ensure safety, performance, and proper separation from power cables.Types of Communication Cables for Cable Trays

Communication cables used in cable trays include:

  • CMP (Plenum-rated): Suitable for air-handling spaces, fire-resistant, and low-smoke emission.
  • CMR (Riser-rated): Designed for vertical runs between floors, providing fire resistance.
  • CMG (General-purpose): For general indoor applications.
  • CM and CMX: Standard communication cables for non-plenum, non-riser applications . These cables are often installed in wire mesh, ladder, or solid-bottom trays depending on environmental conditions, cable density, and airflow requirements .
Installation Considerations
  • Separation from Power Cables: Communication cables should be separated from high-voltage power cables to prevent electromagnetic interference, often using barriers or separate trays .
  • Tie-down and Support: Cables must be secured to maintain spacing, prevent sagging, and comply with NEC Section 392.8(B) for horizontal and vertical runs .
  • Tray Fill and Ampacity: The number of cables in a tray must not exceed the fill capacity, and ampacity derating must be considered for heat dissipation .
  • Environmental Protection: Cables may require jackets resistant to moisture, chemicals, or UV exposure depending on indoor or outdoor installation .
Cable Tray Types for Communication Cables
  • Wire Mesh/Basket Trays: Ideal for high-density fiber optic and telecommunication cables, providing excellent airflow and easy access for changes .
  • Ladder Trays: Suitable for long spans and heavier cable loads, allowing tie-downs and proper spacing .
  • Solid-Bottom or Channel Trays: Used where additional protection is needed or in areas with minimal heat generation .
Standards and Compliance
  • NEC Articles 645, 725, 770, 800, 810, 820: Cover installation requirements for communication, signaling, and data cables in cable trays .
  • UL Listing: Communication cables must be UL-listed for their intended environment, including plenum, riser, or general-purpose applications .
  • NEMA VE1 and VE2: Provide guidelines for cable tray construction, installation, and load ratings .
Best Practices
  • Route communication cables in separate trays from power cables whenever possible.
  • Use tie-downs or barriers to maintain spacing and prevent interference.
  • Select cable tray material (steel, aluminum, stainless steel, or fiberglass) based on environmental conditions and corrosion resistance .
  • Plan for future expansion by sizing trays to accommodate additional cables. By following these guidelines, communication cables in cable trays can maintain signal integrity, comply with safety standards, and allow for efficient maintenance and upgrades.

Cable tray communication cable - COETZER OPTICAL SYSTEMS (Pty) Ltd [PDF]

Cable tray communication cable

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