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Typical EMF & RF Sources in the Home

by ScanTech Technical Consulting - CIH, CSP, BSEE, CHMM, CHP (Pending) · Published September 30, 2013 · Updated August 16, 2023

Homes have several potential sources for high EMF and RF sources including:

External high voltage power lines (both primary and secondary feeders) which can produce elevated levels – particularly in densely populated urban areas / cities such as Dallas, Fort Worth, Houston, Austin, etc. or in homes near utility easements
The main 120/240 volt feed entering the home through the power drop
Breaker boxes
Fluorescent lights (some also have an RF component as well which can cause equipment interference)
High output halogen lamp banks such as those used in track lighting (uses a lot of current)
Appliances with motors or heating elements (washers, dryers, refrigerators, etc.)
AC Adapters
Wiring Errors
Outside Air Conditioning Compressors and Pool Equipment
Wireless Routers, Cell Phones, Bluetooth and Cordless Phones (radio frequency only)
Smart Meters (but fairly low level)
Dimmers (though the range tends to be very short, but I have seen them wreak havoc with sensitive electronic equipment)

The focus should primarily be in areas exposed to EMFs where occupants spend 90 % of their time or greater – this sample schematic gives examples.

Focusing on areas where people spend 90% + of their time

LFE means Low Frequency Electromagnetic – this is the typical ELF (Extremely Low Frequency) band for 60 Hz AC or 50 Hz (Hertz) in Europe and other parts of the world AC power

EMF Sources in the Home 60 Hz AC Magnetic Fields

Typical Low Frequency 60 Hz EMF Sources

Higher frequency RF sources in the home including wireless routers, printers, laptops and other portable cell phone / tablet devices – DECT means Digital Enhanced Cordless Telecommunications

Typical High Frequency RF Sources in the Home

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