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How to lay temperature-sensing cables in cable trays

Temperature sensing cables in cable trays should be installed centrally or in multiple runs depending on tray width, secured with non-combustible clips, and positioned to maximize heat detection while avoiding obstruction of power or data cables.Cable Positioning and Layout

For single-tier cable trays up to 0.6 meters wide, a single run of linear heat detection (LHD) cable should be positioned in the center of the tray to ensure uniform temperature monitoring . For trays wider than 0.6 meters, two runs spaced equally apart are recommended to cover the full width effectively . In multi-tier trays, cables can also be mounted underneath the tray using V-clips to monitor each tier . A serpentine or wave pattern along the tray is often used to maximize coverage and detect localized hot spots . The cable should be positioned 150–250 mm above the tray and kept free from obstruction by power or data cables .

Mounting and Securing

Use non-combustible clips or stainless steel fastenings to secure the sensing cable . Avoid plastic cable ties or trunking as primary support, as they may compromise circuit integrity or fail under high temperatures . Clips should maintain proper sag to prevent tension on the cable and allow thermal expansion . For splicing, overlap layers of splicing tape to prevent moisture ingress, and use low-temperature splicing tape if working below 0°C . Ensure all connections are weatherproof and mechanically protected.

Sensor Types and Integration

Linear heat detection cables can be digital or analogue, with some systems providing hot spot localization and rate-of-rise detection . Fiber optic distributed temperature sensing (DTS) systems are also used for continuous real-time monitoring, particularly in high-density or critical installations . These systems can be integrated with fire alarm or suppression systems for automated response .

Environmental and Safety Considerations

Select cables with robust insulation or stainless steel braiding to withstand mechanical damage, dust, moisture, and temperature fluctuations . Grounding and bonding of cable trays is essential to prevent electrical hazards . Regular inspection and maintenance ensure the system remains effective over time.

Summary
  1. Positioning: Centered for narrow trays, multiple runs for wide trays, serpentine layout for coverage.
  2. Mounting: Non-combustible clips, proper sag, protected splices.
  3. Height: 150–250 mm above tray, avoid obstruction.
  4. Integration: Connect to fire alarm or suppression systems; consider digital or fiber optic sensors.
  5. Protection: Use robust, durable cables suitable for environmental conditions. Following these guidelines ensures early detection of overheating, minimizes fire risk, and maintains operational safety in cable tray installations .
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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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