ELF (Extreme Low Frequencies) EMF Sources

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ELF (Extreme Low Frequencies) EMF Sources can be found all over our house and workplace. They can be kitchen appliances, motors, air condition, and also infrastructure elements.

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Low-frequency electromagnetic radiation (mainly magnetic field) is created around an electric conductor when an electric current is making its way across it. Therefore most, if not all, electric appliances will produce some levels of low-frequency magnetic fields around it. The ELF magnetic field is determined on the current only, so If and when the current changes the field will change (in the same frequency).

The electric power supply to our homes and cities is “Alternating Current” (AC) in the frequency of 50 to 60Hz (60 cycles per second). Since the electric power supply frequency is around 50 or 60Hz, then most of the low-frequency EMF/EMR in our house/city environment will also be close to 50 or 60Hz; most but not all. The earth also produces a magnetic field, but the earth’s field is mostly a constant field (DC).

The 2 main facts about the low-frequency magnetic field are:

1. It is very hard to block it and sometimes when blocked, it will pass around the barrier(if not big enough). The barrier materials are very expensive.

2. It fades away at very short distances from the source, and most of the time the best thing to do in order to reduce your exposure to it is to move (or to move it) one meter away.

Safety distance from ELF (Extreme Low Frequencies) EMF Sources

The following info is given in general lines. It is possible that two similar devices of the same type, of different models or brands (e.g. a refrigerator), will emit different levels of ELF magnetic fields. It is possible that the levels and the safety distances will change according to the electric current consumption of the devices and equipment, their level of maintenance, the way it is connected to the electricity, and the model of the device. In any case, you need to test the ELF levels and the safety distances from sources. using your EMF meter to be 100% of the safety distances.

Source	Frequency	Safety Distance in meters	Comments
Stationary Personal Computer – wired	LF	0.5
Wired Laptop	LF	0.5
LED/LCD PC screen	LF	0.5
Printer	LF	0.5
Modem	LF	0.5
Wired Router/ Switch	LF	0.5
Wired Keyboard	LF	Safe	Some EHS people will feel the LF and DC fields from the keyboard and mouse.
Wired Mouse	LF	Safe	As above
Refrigerator	ELF	1-2
The transformer in a microwave oven	ELF	1-2	While the oven is heating, also RF emission from the oven
Air condition compressor	ELF	0.5-2
Air Fan	ELF	0.5-1
LED or CFL light bulbs	LF	0.5-1
Flore standing/ Desk standing lamps and lamps that are hanging down from the ceiling.	ELF Electric field	0.5-1
Home electric cabinet	ELF	1-3
Office electric cabinet	ELF	1-5
Industrial electric cabinet	ELF	2-5
Cable/Sat TV set-top box	LF	0.5	some may have wireless capabilities as well
Stereo audio system	LF	0.5-2	some may have wireless capabilities as well
LCD/LED TV	LF	0.5	some may have wireless capabilities as well
CRT TV	LF	2-3	from the sides, back and front.
Water pump	ELF	0.5-2
Aquarium internal filter	ELF	0.5-2
Aquarium external filter	ELF	1-2
Electronic power supply (switching power supplier)	LF	0.5
Coil Power converter up to 100W	ELF	2
The electric company power converter	ELF	5-10
Upper power line 220V	ELF	5-10
Upper power line 10KV	ELF	5-10
Upper power line 400KV	ELF	50-100

Video link: EMF/EMR sources in the low frequency

ELF magnetic field from a PC printer — ELF magnetic field from a Toaster Oven