Magnetic field mitigation above a double trefoil HV underground power line

In the last years the effects on human health as a consequence of the exposure to low frequency (LF) magnetic fields generated by electrical energy transmission, distribution and utilisation systems, were considered by different institutions. Reference levels were indicated in the guidelines issued by the International Commission on Non-Ionising Radiation Protection (ICNIRP) and in the European Council Recommendation of 12 July 1999 [1, 2]. Despite the fact that “…measures with regard to electromagnetic fields should afford all Community citizens a high level of protection; provisions by Member States in this area should be based on a commonly agreed framework, so as to contribute to ensuring consistency of protection throughout the Community”[2], national laws provide a non-homogeneous framework. A decree issued in Italy in July 2003 [3] set the new severe limit of 3µT in terms of rms magnetic flux density levels close to new plants.