Hello Andy, Thank you for pointing out the ICNIRP limits: Actually, I recently had a request concerning a service technician with a pacemaker and exposure to static magnetic fields when handling permanent magnet rotors. However, when I check ICNIRP resources, I do not find any publication to justify higher limits. On the contrary, the “ICNIRP GUIDELINES ON LIMITS OF EXPOSURE TO STATIC MAGNETIC FIELDS” (https://www.icnirp.org/cms/upload/publications/ICNIRPstatgdl.pdf) contain the statement:
“Electromagnetic interference from low-intensity static magnetic fields has been observed to affect the operation of pacemakers, particularly those with magnetic switches, and other types of medical electronic devices, including cardiac defibrillators, hormone infusion pumps (e.g., for insulin), neuromuscular stimulation devices (e.g., for the sphincter muscle of the bladder), neurostimulators, and electronically operated prosthetic devices (e.g., for the limbs and inner ear). In general, the operation of these devices is not adversely affected by static magnetic fields below 0.5 mT." The "ICNIRP GUIDELINES FOR LIMITING EXPOSURE TO TIME-VARYING ELECTRIC AND MAGNETIC FIELDS (1 Hz TO 100 kHz)" (https://www.icnirp.org/cms/upload/publications/ICNIRPLFgdl.pdf) contain the following statement: "Compliance with the present guidelines may not necessarily preclude interference with, or effects on, medical devices such as metallic prostheses, cardiac pacemakers and implanted defibrillators and cochlear implants. Interference with pacemakers may occur at levels below the recommended reference levels. Advice on avoiding these problems is beyond the scope of the present document but is available elsewhere (IEC 2005b)." (IEC2005b refers to IEC 60601-1-2) Kind regards, Bernd Von: McCallum, Andy <andy.mccal...@mottmac.com> Gesendet: Freitag, 6. Juli 2018 09:41 An: Dürrer Bernd <bernd.duer...@wilo.com>; EMC-PSTC@LISTSERV.IEEE.ORG Betreff: RE: [PSES] EN62311 - Human Exposure to Electromagnetic Fields Bernd Pacemakers have DC static magnetic field limits as low as 0.5mT as mentioned in the EU EMF directive. Which is a level encountered in many environments not least DC Trams and railways. The fact that we don’t see people with pacemakers staggering around the underground suggests this limit has been set far too low (most likely when pacemakers where first introduced). The ICNIRP public exposure limit is 400mT which is much more realistic and only encountered rarely. Contacted a number of UK government agencies regarding this and the most honest verbal response was we will get rid of that limit after Brexit. Also note a number of pacemakers are now available which are safe to wear in MRI scanners operating at 7Teslas. Andy From: Dürrer Bernd [mailto:bernd.duer...@wilo.com] Sent: 06 July 2018 08:24 To: mailto:EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] AW: [PSES] EN62311 - Human Exposure to Electromagnetic Fields Hi Doug, I assume that due to your good health you don’t have a pacemaker or any other electronic medical implants that might be affected by EM field exposure. As protection and shielding options for such implants are limited (except by the surrounding tissue), the remaining other option to reduce the risk of malfunction is to limit EM fields. Stay in the best of health and have a nice weekend, Bernd Von: Doug Smith <mailto:d...@emcesd.com> Gesendet: Donnerstag, 5. Juli 2018 20:56 An: mailto:EMC-PSTC@LISTSERV.IEEE.ORG Betreff: Re: [PSES] EN62311 - Human Exposure to Electromagnetic Fields Hi Michael and the group, With the exception tissue heating generated by some sources at very high frequencies, I wonder if the EM field exposure worries today are a bit overblown. I started my experiments in high voltage (100,000+ Volts, and NOT static electricity) around age 13 and by age 14 was regularly immersing myself in 10,000+V/m, 300 kHz fields. It was fun, heating up screw driver blades from induction heating, lighting incandescent light bulbs (as well as fluorescent tubes) without wires, and more. About 600 Watts of RF energy was concentrated in the relatively small space I was in and I was uninjured! My kids all have two arms, two legs, and one head and I am still here almost 60 years later and healthier than 90% of adults of any age from 18 on. Some of my friends say this explains a lot about me (frying brain cells) though. I realize this is only one case, but have had a lot of high energy RF exposure throughout my life. Such as the field in my dorm room from my amateur radio transmitter being so strong that the fluorescent tubes in the room lit up with no power and blinked with Morse code. I had to remove the tubes from their fixtures and cover with towels so my roommate could sleep. Still here, Doug On Thu, 5 Jul 2018 16:27:12 +0100, Michael Derby wrote: It’s not quite an “unintentional radiator” but if you had a wireless charger which did not contain any communication (e.g., a dumb charging signal without handshaking), then it would come within the scope of the EMCD and the LVD (not the RED), and RF Exposure would therefore be an issue under the LVD. Michael. From: McCallum, Andy [mailto:andy.mccal...@mottmac.com] Sent: 05 July 2018 15:33 To: mailto:EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] EN62311 - Human Exposure to Electromagnetic Fields Be surprised if any LVD could cause EMF large enough to pose a danger to Human Health. Intentional transmitters maybe, a rare beast to create those levels unintentionally at less than 1000V. Andy From: John Woodgate [mailto:j...@woodjohn.uk] Sent: 05 July 2018 10:28 To: mailto:EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] EN62311 - Human Exposure to Electromagnetic Fields It applies to any LVD product, but there is a flow chart that shows that a simple assessment is possible if the product has no reasonable likelihood of producing sufficiently strong EMF. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.woodjohn.uk&data=01%7C01%7CAndy.McCallum%40mottmac.com%7C3897dc1f76c0406b3a9808d5e259910b%7Ca2bed0c459574f73b0c2a811407590fb%7C0&sdata=vOXyjzMm8FtxrbHRrTRbkgWlhb8gQeuv%2FiISyiAwg24%3D&reserved=0 Rayleigh, Essex UK On 2018-07-05 10:09, Amund Westin wrote: EN62311 is listed in OJ and a harmonized LVD standard. Does EN62311apply to any LVD product or only products containing radio transmitters? 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