Re "electrical wiring configurations and childhood cancer".

A causal relationship between the induction of childhood cancer and home exposure to transmission line magnetic fields has been suggested by other authors. The reason for their suggestion is the overrepresentation of childhood cancer cases in high current configuration (HCC) relative to a control distribution of homes near high current and low current configuration (LCC) transmission lines (TL). The author of this letter and the editor estimate the magnetic field exposure at addresses considered in HCC and LC areas and suggests that the 60 Hz magnetic fields in all residences were dominated by ambient household fields.