Northern Line CBTC – Loop detection cable

Project: Northern Line CBTC – Loop detection cable
Location: London, United Kingdom
Company: Transport for London / London Underground
Product: RG7M2 0.6/1kV 2.5mm² x one core


Train locations are confirmed at every transition point through a combination of train odometry and accelerometers for accurate positioning data. The transmission from loop to train is an inductive couple of around 56KHz.
The existing XLPE insulated / LSZH loop detection cables, supplied by another manufacturer, were  breaking where they were installed with tight bends in station pit sleeper block areas.

The challenge was to design a fully compliant cable to meet all the required electrical, physical and fire safety code of practice demands without changing the copper class 2 conductor construction – with a cable that has very good pliability.

TRATOS proposed the use of elastomeric compounds for the insulation and outer sheath.  TRATOS LSZH’s elastomeric compounds had to comply with LU S1085 A3 (Fire safety materials code of practice) and the operational cable service life of 40 years.


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