Method for Laying Temperature Sensing Cables in Cable Trays

Temperature-sensing cables in cable trays are typically laid on top of power cables in a serpentine or wave pattern to maximize coverage and ensure early detection of overheating.

Placement and Layout

Temperature-sensing cables, such as linear heat detection (LHD) or distributed temperature sensing (DTS) systems, are generally installed directly on top of the power cables within the tray to maintain close thermal contact and accurately detect temperature rises along the cable route ( ). To ensure comprehensive monitoring, the sensor cable is often arranged in a serpentine or wave pattern, which allows the system to cover the entire width of the tray and detect localized hot spots effectively ( ).

Routing and Attachment

• Secure attachment: Sensor cables should be fastened using cable ties, clips, or other non-damaging supports to prevent movement while allowing for thermal expansion ( ).
• Avoid tangling: For fiber optic or linear heat sensors, careful routing is essential to prevent tangling, especially when power cables are added or removed ( ).
• Trimming to fit: Some sensor cables, like the Senkox HSD™ Linear Heat Sensors, can be cut to fit the tray layout, which simplifies installation and maintenance ( ).

Handling and Protection

• Durable outer covering: The polymer or protective sheath of the sensor cable must be handled carefully to avoid damage to the inner thermal-sensitive core ( ).
• Environmental considerations: Sensor cables are designed to withstand dust, moisture, and temperature fluctuations, but care should be taken in harsh environments to maintain integrity ( ).
• Splicing and connections: When splicing is required, overlapping layers of splicing tape and proper sealing prevent moisture ingress and maintain sensor functionality ( ).

Integration and Monitoring

Once installed, the sensor cable is connected to a data acquisition or fire alarm system. The integrated temperature sensors along the cable allow precise localization of temperature increases, enabling early intervention before overheating leads to damage or fire ( ). Continuous monitoring ensures operational safety and helps maintain the reliability of the electrical system. By following these practices, temperature-sensing cables in cable trays provide effective, reliable, and maintainable monitoring for early detection of thermal hazards.