60Hz EM fields
Chuck & PSNet... Here's more sources for information on the subject of EM fields vs. humans... The classic book is: 'The Great Power-Line Cover-Up' subtitled 'How the Utilities and the Government are Trying to Hide the Cancer Hazards Posed by Electromagnetic Fields' by Paul Brodeur, 1993, Little, Brown & Co. 'Questions and Answers about EMF; Electric and Magnetic Fields Associated with the Use of Electric Power' Jan 1995 National Institute of Environmental Health Sciences and US Dept of Energy. pub no. DOE/EE-0040 available (?still?) from the Supt of Documents, US Gov't Printing Office, Wash, DC, 202/512-1800. Contains a fairly good bibliography. 'EMF, Scientific & Legal Aspects', 1993, Shaw, Pittman, Potts & Trowbridge, Wash, DC, 202/663-8000. 'The EMF Controversy & Reducing Exposure from Magnetic Fields', White, Barge, George & Riley, 1993, Interference Control Tech, Inc publisher, Gainesville, VA, 703/347-0030. 'Magnetically Induced Currents in the Human Body', Baraton & Hutzler, EDF, 1995, IEC, Geneva publ. +4/122/919-0211 additionally, Bonneville Power, here in the US Pacific Northwest has done ongoing studies regarding the effects of power EMF on organisms and has published a review of their work from time to time... I don't have a current one to give you a better reference. Even tho more data is published from time to time, there doesn't seem to be clear, unrefutable evidence that there is or is not a link between the EMF and human illness... so the controversy will continue to rage... - - - - - Peter E Perkins Principal Product Safety Consultant Tigard, ORe 97281-3427 +1/503/452-1201 phone/fax p.perk...@ieee.org email visit our website: http://ourworld.compuserve.com/homepages/peperkins - - - - -
60Hz EM fields
Hi Folks Might someone have some information as to the harmful affects of 60 Hz magnetic fields of overhead power lines, or where I might look for some information. Thank you and have a great day Chuck
RE: 60Hz EM fields
I forgot to mention one very important study. The American Physical Society (202-662-8700) published a statement in April 1995 concerning "Power Line Fields and Public Health." You may be able to find this one on the web. > -- > From: WOODS, RICHARD > Sent: Friday, June 12, 1998 9:25 AM > To: emc-p...@majordomo.ieee.org; 'chuck_p_olb...@waters.com' > Subject: RE: 60Hz EM fields > > Chuck, the effects can be broken down into two areas: acute or short term > effects and chronic or long term effects. Acute effects are fairly well > known, understood, and documented. The major effect is nerve stimulation > with the threshold of current density being about 1.2 A/sq m, and the > threshold of the internal electric field being 6.2 V/m. Current density is > related to the electric field by the conductivity of the tissue. The best > book on the technical aspect of nerve stimulation is "Electrical > Stimulation and Electropathology" by J. Patrick Reilly, Cambridge > University Press, ISBN 0-521-41791-0. > > Chronic effects are not well understood at all and there is a lot of "junk > science" and conflicting studies out there. Be careful. After you digest > the reliable reports, you will discover that if there are chronic effects, > such as cancer, the fields that cause them are reported to be magnitudes > lower than those that cause acute effects. > > Richard Woods > Sensormatic Electronics > wo...@sensormatic.com > Views expressed by the author do not necessarily represent those of > Sensormatic. > > -- > From: chuck_p_olb...@waters.com[SMTP:chuck_p_olb...@waters.com] > Reply To: chuck_p_olb...@waters.com > Sent: Thursday, June 11, 1998 3:26 PM > To: emc-p...@majordomo.ieee.org > Subject:60Hz EM fields > > > > > > Hi Folks > > Might someone have some information as to the harmful affects of 60 > Hz > magnetic fields of overhead power lines, or where I might look for > some > information. > > Thank you and have a great day > > Chuck > > >
RE: 60Hz EM fields
Chuck, the effects can be broken down into two areas: acute or short term effects and chronic or long term effects. Acute effects are fairly well known, understood, and documented. The major effect is nerve stimulation with the threshold of current density being about 1.2 A/sq m, and the threshold of the internal electric field being 6.2 V/m. Current density is related to the electric field by the conductivity of the tissue. The best book on the technical aspect of nerve stimulation is "Electrical Stimulation and Electropathology" by J. Patrick Reilly, Cambridge University Press, ISBN 0-521-41791-0. Chronic effects are not well understood at all and there is a lot of "junk science" and conflicting studies out there. Be careful. After you digest the reliable reports, you will discover that if there are chronic effects, such as cancer, the fields that cause them are reported to be magnitudes lower than those that cause acute effects. Richard Woods Sensormatic Electronics wo...@sensormatic.com Views expressed by the author do not necessarily represent those of Sensormatic. > -- > From: chuck_p_olb...@waters.com[SMTP:chuck_p_olb...@waters.com] > Reply To: chuck_p_olb...@waters.com > Sent: Thursday, June 11, 1998 3:26 PM > To: emc-p...@majordomo.ieee.org > Subject: 60Hz EM fields > > > > > > Hi Folks > > Might someone have some information as to the harmful affects of 60 Hz > magnetic fields of overhead power lines, or where I might look for some > information. > > Thank you and have a great day > > Chuck > >
Re: 60Hz EM fields
Hello Chuck, A) Go to the Alta-Vista search tool (or other favorites) and put in the term: "power line" AND "cancer"or try: "power +line +cancer" It will direct you to many links. B) Go to the Safety Link (http://www.safetylink.com) and look for the link to "NIOSH". I believe they have material on this subject (and they used to offer a free booklet too). Regards, Art Michael * * * * * * * * * * * * * * * * * * * * * * * International Product Safety News * *Check out our current offer on the * * Safety Link at http://www.safetylink.com * * * * * * * * * * * * * * * * * * * * * * * On Thu, 11 Jun 1998 chuck_p_olb...@waters.com wrote: > > > > > Hi Folks > > Might someone have some information as to the harmful affects of 60 Hz > magnetic fields of overhead power lines, or where I might look for some > information. > > Thank you and have a great day > > Chuck > > >
Re: 60Hz EM fields
Chuck: There is a comprehensive review and assessment of studies on this subject presented in the Oct. 1995 issue of the IEEE Spectrum probably the most trustworthy survey source for this type of information. The EMC Society Newsletter (issue #168, winter 1996) had a brief comment on a 10-year study conducted by the National Council on Radiation Protection and Measurements that recommended housing, schools, etc. not be built under power lines IF FIELDS EXCEED 0.2 microtesla. National Geographic did a 1-hour special that essentially said "no problem," "inadequate correlation," and criticized the multi-billion dollar impact such unfounded fears have had on the US economy to date. I have lived under power lines for the last 20 years with no reports of my neighbors having any negative effects. In fact, I have measured the fields in and around my home (which is centered about 70 feet off the axis of the high voltage lines supplying the substation that is approximately 100 feet from my house). I found the fields OUTSIDE to be well under 0.1 microtesla; however, I measured many locations over a HUNDRED times higher INSIDE the home. Areas near refrigerators, fluorescent lights, clock radios, etc. ALL produced fields much greater than those generated by the outside power lines. The relative placement of the power lines on the support structure to achieve field cancellation is probably most important in providing compatibility of power distribution systems. It seems the housing construction standards (and perhaps electric appliances) are far more in need of the public's concern about the biological effects of low-frequency magnetic fields. Mike Conn Owner/Principal Consultant Mikon Consulting
