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Supporting railway cable performance and ongoing surveillance for safer networks

Posted: 10 May 2021 | | No comments yet

Cable performance is paramount to railway safety, so how can you be assured that the cables being used are suitable? Jaya Skandamoorthy, Regional Technical Manager, UK and Europe, at the British Approvals Service for Cables (BASEC), explains the importance of independently approved cable products and ongoing surveillance, designed to safeguard global railway applications and their supporting infrastructures for decades to come.

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Cable performance challenges

Safety remains the highest concern for operators and professionals within the railway industry. Infrastructure relies heavily on the efficient use of power cables to support signalling and power transmission. This includes everything from controls, switches and traffic management systems, to connectivity, signal boxes and equipment located on the railway tracks themselves. Interaction is required between these applications and the rolling stock to ensure a smoothly operated system.

Cables must be able to sustain functioning pressures such as heavy loads, high speeds and exposure to unfavourable weather conditions. Common causes of railway cable failures include abrasion and fauna damage, as well as loose connections, corrosion and contamination damage. Often, these failures can all lead to costly downtime that is required to make the relevant repairs. They can also be a contributing factor to overheating and flashover leading to fire, which, in turn, puts people’s safety and lives at risk. In assessing the levels of cable quality prior to installation, through rigorous independent testing, you can work towards minimising the likelihood of faults and failures. Certification enables cable performance to be tested to ensure that the cables used meet industry standards, as well as the application’s operating needs.

There is an ever-increasing demand for high quality railway cabling products, which function reliably and efficiently. Demand for cables that can evidence enhanced performance characteristics, compatible with the industry’s standards, is also growing.

Standards conformity requirements for railway signalling and power transmission cabling differs by country and region, often in accordance with the relevant railway authorities and operators. Ensuring that products have been verified to meet the standard’s performance requirements helps to safeguard the railway networks.

Cable testing and certification

To ensure the highest levels of quality are met, cables must be subjected to rigorous laboratory testing and continuous assessments of factory production quality. Factors which may compromise the cables’ performance, durability and safety can then be identified and minimised.

Several different testing and certification standards exist to justify that the quality and safety claims made by cable producers are valid. Standards can be specific to cabling performance in line with key areas of operation – for example, those concerned specifically with rolling stock and, respectively, to infrastructures or signalling. While there are often local variations of rail testing standards set by each country, there are many International, British or European standards, such as BS 7846, which are recognised globally.

The BS 7846 standard is focused on testing circuit integrity and resistance to fire, which is imperative to cables that need to continue to operate soundly under such circumstances. Circuit integrity testing is essential to cabling used in emergency management systems for applications such as alarms, sprinklers and lighting. In addition to assessing fire performance, BASEC supports the verification of many different cable aspects, including the design, material properties, mechanical and electrical performance, and reaction to chemical exposure in line with compliance requirements.

Ongoing quality surveillance

The railway industry has a commitment to ensure quality, safety and sustainability in order to protect those using and working within the services, as well as the actual infrastructures. Key to this, stakeholders should ensure that their cables, which are integral in connecting systems, are compliant with the standards that are in line with the operating needs. With strict maintenance procedures at the forefront of the industry, cabling systems are a vital part of the infrastructure that must be included within maintenance schedules. Ongoing surveillance, which is designed to regularly assess cable quality and compliance, is delivered for cables via third party certification providers, such as BASEC, to limit and prevent failures or impacts to service. Certification is maintained via auditing of the manufacturing processes and testing of cable samples two to three times a year, over a three-year cycle.

BASEC is also focused on supporting the railway industry through ensuring that cable quality has been maintained throughout the supply chain. Sourcing cables from an approved Registered Stockist provides assurance to those specifying cable products. Approved distributors are assessed to understand that storage and handling since leaving the manufacturer has not compromised or inadvertently damaged the cable. Take the all-important step towards protecting your railway networks and safeguarding your projects by purchasing only approved cables from approved stockists.

Summary

It is crucial that railway cables evidence quality and performance in line with standards, delivering essential power supply to maintain efficient operations. With safety being a critical aspect to the protection of your passengers, workers and applications, independently verified cables provide you with the peace of mind that they are safe and will continue to function.

In addition to using cable products that have been independently tested, regular surveillance checks are also important to ensure that cable performance is maintained, helping to avoid the costly risk of cable failures in the future. Quality cables that have been thoroughly assessed are vital to supporting railways in the future. Can you be confident that your cables are safe? If unsure, check with BASEC.

SkandamoorthyJaya Skandamoorthy has significant expertise in policies, regulations and standards. Having graduated in Civil Engineering from the Imperial College London, he has conducted testing on buildings and civil infrastructure, such as underground tunnel linings and highway bridges. He has previously worked on European Design Codes and the Construction Products Directive. Prior to joining BASEC, Jaya worked for a building research, testing and certification body, where he led innovation projects and business growth in the UK, Europe and China. Jaya can be contacted on +44 (0) 7584 195474.

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