Residential field source at power frequencies

EPRI (The Electric Power Research Institute) is conducting studies to provide engineering data on the sources of residential AC magnetic fields. An overview of the sources of residential AC magnetic fields and their characteristics is presented. The following sources have been identified as contributing to the magnetic field in residences: residential grounding system currents, unusual wiring configurations in the residence, distribution lines, transmission lines, and appliances. Distribution lines as a source of magnetic field were further divided into balanced currents on the primary and secondary wires and net current (the vectorial sum of all the currents in the primary and secondary wires). The spatial, temporal, and harmonic characteristics of these magnetic field sources are summarized