An Activity Systems Model for Estimating Human Exposure to 60 Hz Electric Fields

This paper describes a methodology that can be used to develop estimates of exposure to 60 Hz electric fields of transmission lines for a variety of human activities. The method, called an Activity Systems Model, is used to characterize human activities in situations where exposure to electric fields is possible. The model provides the framework that combines electric field maps, activity maps, and experimentally determined ``activity factors´´ to produce histograms of time spent in various levels of electric field strength. An assortment of 74 activity factors based on 725 individual measurements are provided in the paper. Results of an activity systems model can be used to quantify public exposure to electric fields. (This work was supported by EPRI, RP799-16.)