Electrical engineering. A wire code classification developed by Nancy Wertheimer and Ed Leeper in 1979 as a surrogate for residential magnetic field exposure. For the Denver region in USA, the electrical wiring configurations were classified in 4 categories based on the distance of the home to different types of power lines and transformers. The categories are: very low current configuration (VLCC), ordinary low current configuration (OLCC), ordinary high current configuration (OHCC) and very high current configuration (VHCC).
This estimate of exposure to magnetic fields was used to investigate possible connection of childhood leukemia and power lines in the USA.
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