Electromagnetic compatibility (EMC) defines the ability of electrical and electronic equipment to operate acceptably when exposed to external electromagnetic sources and limiting internally generating unwanted electromagnetic energy. EMC covers three areas. Limiting emissions generated by the equipment, its susceptibility to external sources and its level of immunity when functioning in its defined environment. To begin with, EMC caused a large number of issues across a great number of industries and applications. Back in the early 1990s one of the most severe incidents of interruption of an auto pilot system by passenger electronics was from a portable CD player (1). Anyone who has flown will have been asked to put their mobile phone into flight mode. Rail network operators too have recorded numerous events due to electric trains causing issues with trackside signalling.