A simple model for calculating residential 60-Hz magnetic fields.

Area of Science:

• Environmental Health
• Electromagnetics
• Applied Physics

Background:

• Residential magnetic fields pose potential health concerns.
• Accurate measurement and modeling of these fields are crucial for exposure assessment.
• Existing methods for mapping residential magnetic fields can be complex and time-consuming.

Purpose of the Study:

• To develop and validate a predictive model for calculating 60-Hz magnetic field densities throughout a residence.
• To simplify the process of assessing residential magnetic field exposure.
• To investigate the temporal stability of magnetic field measurements.

Main Methods:

• A model was developed combining fields from external sources (measured) and the residential grounding circuit (calculated).
• A data-acquisition system recorded grounding current magnitude/phase and external field data.
• Model predictions were validated against magnetic field measurements in 23 houses and a detailed single-house study.

Main Results:

• The model demonstrated good predictive capability with a correlation coefficient of 0.87 when compared to single-location measurements in 23 houses.
• Detailed analysis in one house showed reasonable agreement between model predictions and measurements throughout the residence.
• Daily averages of magnetic fields were found to be more stable than hourly averages.

Conclusions:

• The presented model offers a practical and accurate method for calculating residential 60-Hz magnetic field densities.
• The model facilitates the creation of magnetic field profiles within homes, aiding exposure assessment.
• Understanding temporal variability is important for accurate magnetic field exposure assessment.