Mitigation of extremely low frequency magnetic fields from electrical installations in high-rise buildings

The health impacts on people exposed to power line generated magnetic fields remains somewhat controversial. Under certain circumstances, such extremely low frequency (ELF) magnetic fields also arise in high-rise buildings in Hong Kong, causing interference with sensitive equipment, and with it concerns about the potential health impacts on affected persons. Due to a general lack of awareness electrical design and installation engineers rarely consider the issue. This paper discusses the problem of ELF fields generated by a buildingʹs electrical distribution system, and provides simplified analytical techniques that lead to practical solutions for eliminating interference problems as well as reducing concerns about health impacts.