Magnetic Fields
EEMF & Electrical Hygiene
About This Health Driver
Extremely low frequency (ELF) magnetic fields are produced by current flowing through wiring, appliances, and transformers. Unlike electric fields, magnetic fields penetrate most building materials and cannot be shielded easily. Field strength decreases rapidly with distance from the source.
How It Affects Bodies
The primary proposed mechanism for biological effects of ELF magnetic fields is disruption of melatonin synthesis through interference with magnetite-containing cells or direct effects on pineal function. Melatonin suppression affects circadian regulation, sleep quality, and immune function. The evidence base includes epidemiological associations and mechanistic proposals, but controlled residential-exposure studies are limited.
Where It Comes From
- Building wiring - current-carrying conductors, particularly unbalanced circuits
- Electrical panels - concentrated current sources
- Appliances - motors, transformers, and heating elements
- External power lines - transmission and distribution lines near the building
- Net current on plumbing - return currents on metal water pipes
How to Address It
- Bed placement away from sources - minimum three feet from panels, meters, and major circuitsInteriors
- Wiring layout design - minimize net current loops near sleeping zonesElectrical
- Appliance placement - distance high-field appliances from occupied zonesInteriors
- Field measurement - milligauss meter assessment of sleeping zones at commissioningOperations