Low frequency magnetic interference in high-rise buildings

With increasing demands for electric power in large commercial buildings the problem of magnetic interference to sensitive equipment has increased. However, low-frequency (ELF) electromagnetic interference is not generally addressed in the design and installation of building electrical distribution systems. The development of the upper limit of the background magnetic field levels in office buildings is discussed in relation to the physical layout of current carrying conductors. A numerical computation method is described, and technical approaches or for magnetic field mitigation are discussed. To achieve a compatible magnetic environment good practice in the design for electrical installations are outlined.