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Electromagnetic Field (EMF) Exposure Problems

25 messages,  Last post on May 23, 2009 at 10:15 PM

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#24 of 25 comments on mevander1 post #23 by concerned9 Nov 10, 2008 (11:01 pm)
On EMF dangers. I am not familiar with the wiring in modern hybrid cars but in order for the return line to cancel the field from the positive terminal they must be bond together as in residential wiring. If they are not then they are like high power transmission lines which can generate very high fields. Cars usually have the negative terminal tied to the car body, so no return lines and if this is the case then cancellation would NOT occur. Also the Faraday shield argument does not apply to magnetic fields, only electric fields, and it is the magnetic fields that are of a concern. Finally, the earth's magnetic field is static and any reasonable measurement approach would only record dynamic or time varying fields, which are the health concern. I see nothing in these arguments, from an engineering view, that would make me feel good about buying a hybrid, unless I had time varying magnetic field data. If I have misinterpreted your response, please let me know. Thanks.
#25 of 25 emf radiation and hybrids by yssab May 23, 2009 (10:15 pm)
Replying to: mevander1 (Jun 08, 2008 3:14 am) I will refer to your first reply for the engineering of it all but I can say practically that there are varying levels of emf measurable easily and reliably with a tri-field meter (I have the emdex snap) in any hybrid. People who are sensitive report difficulties with readings over 1mg and those of us who have concerns about emfs are drawing the safety line around 2mg. I must give compliments to toyota for having taken obvious care to minimize the emf in the Prius (haven't driven other toyota hybrids). It is consistently under 2mg around all organs one might care about (torso and head) there is 3-4 mg reading around the feet but . . . I am not so worried about my toes. I tested the Insight and found readings from 2.5 to 4.5/5 - tending to be higher in the back seat, where children - who are always more vulnerable to environmental toxins - would be sitting. Readings at the floor were 14-20. In a standard (gas engine) car we have never found any such readings (.4 to .8 - perhaps getting up to 1 or so right on top of the instrument panels on the dash). The mere fact that Toyota has taken pains to isolate the electrical system I think speaks clearly to their assessment of risk and I applaud them for taking safety measures (even if ultimately for their own good) quite a few years before this issue will become one of common public concern.

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