Managing electromagnetic compatibility on the london underground system

This paper explains the issues faced in managing electromagnetic compatibility (EMC) on the London Underground (LU) network and the processes and techniques used to ensure compatibility between the assets comprising the LU system and between the LU system and third parties. Actual examples are given where possible to assist explanation. It is essential that electromagnetic compatibility (EMC) is achieved and maintained between the railway assets and the surrounding infrastructure in order to ensure its safe and reliable operation. For major projects this may not be entirely achieved by the total reliance on the implementation of standards, compliance with the EMC directive and regulation: SI 1992, No. 2372. It is critical that additional, risk-based, contractual requirements are specified to ensure that functional safety is addressed. This includes ensuring that gaps in standards are mitigated, signalling compatibility is achieved, credible failure conditions are addressed and special cases unique to the LU are considered. Independent assessment (if appropriate) needs to be performed and LU contractual standards must be properly met. These requirements must be implemented by using adequate EMC control/management during the entire project life cycle and the appropriate assurance evidence must be is produced to show compliance with the safety case requirements, the EMC regulations and the contract. (11 pages)