Video Training : Installing Rail Cable Joints (Heat Shrink Zero Halogen) - LU & Network Rail

By Chris Dodds on 7th May, 2015

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Video Training : Installing Rail Cable Joints (Heat Shrink Zero Halogen) - LU & Network Rail

Rail Cable Joints.

LU & Network Rail.

SPS cable joints are Network Rail (PADS) and LUL approved. SPS cable joints approved for cable jointing trackside power, signal, telecom and tunnel cables.


  • LSF Tunnel Cable Joints
  • Fire Resistant Cable Joints
  • BR880 Rail Power Cable Joints
  • Signalling (7-61 Core) Cable Joints
  • Track Circuit Cable Joints
  • CCTV Coaxial & Telecom Cable Joints
  • Cable Repair Kits for LV HV


T&D are Link-up Registered and Approved Vendors to Network Rail and TfL London Underground (LU).

In recent years, halogens have come under scrutiny for the toxicity and corrosivity of their combustion byproducts, namely gases. London Underground 1-085 standard (Fire Safety Performance Of Materials) specifies and controls the installation of low smoke zero halogen cables and accessories on the sub-surface rail network ; this includes cable labels.   

Video : Cable Joints - Low Voltage Heat Shrink Zero Halogen Cable Joints

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Zero Halogen Low Smoke & Fume Cables 

The use of halogenated compounds in the wire and cable manufacturing industry has decreased in recent years with a phasing out of PVC polymers for cable in certain rail industry applications - zero halogen, low smoke fume cables are specified for enclosed and high-density cable applications where public safety and evacuation is critical in fire situations.

Low smoke and zero halogen cables give off cleaner smoke when burned - it is important to understand theat smoke production and halogen content levels are not mutually exclusive. Halogenated low-smoke compounds exist as do halogen-free compounds that are not low smoke.  

Low smoke and zero halogen cables have different meanings and cannot be loosely categorised as equal or interchangeable terms. An electric cable can be low smoke without being halogen free or vice versa. Halogen free cables produce clearer, whiter smoke while chlorinated polymers tend to produce thicker, darker smoke when burned. 

During a fire, a low smoke cable is desirable because it reduces the amount and density of the smoke, facilitating safe public evacuation and fire fighting. 


Zero Halogen Cables & Joints

A zero-halogen cable does not contain any of the chemical elements defined as a halogen. Even though some materials and compounds used in wire and cable manufacture contain no halogens, others include a high percentage of halogens with the most common being chlorine, fluorine and bromine. 


Zero Halogen Conclusion

The clearest use for low smoke zero halogen cables are confined spaces with dense cable concentration in proximity to the public and sensitive electronic equipment. Fire occurence and spread can in open areas lead to smoke concentration obscuring escape routes due to toxic gas emissions. 

For rail cable projects, it is important to consult with cable and cable accessory experts to choose correct and safe products for that application.

For further readingThe Case For Low Smoke Zero Halogen Cable Labels & Public Safety


Heat Shrink Rail Cable Joints - LSF Zero Halogen Cable Joints - SPS (Installation Instruction)

Category:  Rail

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