Hi all, It's not unusual for a chain saw, electric or gas powered, to be held close to the upper torso during use. The same can be said for backpack mounted leaf blowers I suppose. Lots of arcing occurs at the brush/commutator interface.
Regards, Art A.E. Michael, Dir. of Engineering Product Safety Int'l 166 Congdon St. East Middletown CT 06457-2107 U.S.A. Phone : (860) 344-1651 Fax : (860) 346-9066 Email : [email protected] Website: http://www.safetylink.com ==================================================== On Mon, 25 Oct 2010, [email protected] wrote: > Electric chain saw? > > > > From: > "McInturff, Gary" <[email protected]> > To: > "[email protected]" <[email protected]>, > "[email protected]" <[email protected]> > Date: > 10/25/2010 09:26 AM > Subject: > RE: [PSES] Test Standards for immunity to EMI from TIG and MIG welders? > Sent by: > [email protected] > > > > The medical article is interesting reading in a couple of spots - magnetic > fields are noted several places - electric tooth brushes being one of > them. > > Although I don't know that they went far enough - at least in the > following case > > "Chain Saws - Recommend maintaining at least 12 inches (30 cm) separation > between the motor and the implant device". > > Maybe they should add that the cutting bar is 18 inches and should be > pointed the other direction :) > > Why would a chain saw be any more problematic than any small gas powered > engine? > > > -----Original Message----- > From: Pat Lawler [mailto:[email protected]] > Sent: Monday, October 25, 2010 9:05 AM > To: [email protected] > Subject: Re: [PSES] Test Standards for immunity to EMI from TIG and MIG > welders? > >> From < > http://www.med.unc.edu/medicine/card/fellows/patientinstructions/EMI.pdf> > : > > "Note: If you have an ICD [Implantable Cardiac Defibrillator], some strong > > magnetic fields may cause > your device to make beeping tones." > > Wow - I hope patients know about the possibility of beeping! If I didn't > know, and my chest started beeping, I think I'd have a heart attack. > > Pat Lawler > EMC Engineer > SL Power Electronics Corp. > > [email protected] wrote on 10/22/2010 03:12:53 PM: >> Page 4 of >> http://www.med.unc.edu/medicine/card/fellows/patientinstructions/EMI.pdf >> has some welding specific guidelines but no references as to where the >> numbers came from. I'd ask the source ( www.guidant.com ) what studies >> back up their assertions. Also see >> http://www.ncbi.nlm.nih.gov/pubmed/1279591 and >> > http://samplecode.rockwellautomation.com/idc/groups/literature/documents/ >> wp/nets-wp002_-en-p.pdf . >> >> Orin > >> On Fri, 22 Oct 2010 13:48:39 -0700 [email protected] writes: >>> Though I have seen lots of mentions of electromagnetic emissions by >>> welding equipment in the web searches I have done, I have seen no >>> quantitative measurements. >>> >>> The only indirect indication of the level of emissions is the >>> immunity >>> levels called out in IEC 60974-10 (10 V/m as per IEC 61000-4-3, >>> which our >>> equipment meets as well). But my guess is that this test is nearly >>> redundant for the equipment manufacturers, since I expect the level >>> of >>> emissions produced during welding to be as much if not more of a >>> problem. >>> >>> Donald Borowski >>> Schweitzer Engineering Labs >>> Pullman, Washington, USA >>> >>> >>> >>> From: >>> John Woodgate <[email protected]> >>> To: >>> [email protected] >>> Date: >>> 10/22/2010 01:37 PM >>> Subject: >>> Re: Test Standards for immunity to EMI from TIG and MIG welders? >>> Sent by: >>> [email protected] >>> >>> >>> >>> In message >>> > <ofb20eb02e.ce4c32e9-on882577c4.0061e8f4-882577c4.00638...@selinc.com>, > >>> >>> dated Fri, 22 Oct 2010, [email protected] writes: >>> >>>> So my last (and now most important) question is: Is there any >>>> literature describing the electromagnetic environment around TIG >>> and >>>> MIG welders while in operation in the field? >>> >>> I'm sorry that the IEC standard was inadequate. It's true that the >>> welding process in inherently subject to large variations in almost >>> >>> every characteristic. >>> >>> I looked at standards related to exposure to EMF from arc welding >>> equipment, (such as EN 50444) but I did not find any description of >>> the >>> environment. >>> -- >>> OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and >>> www.isce.org.uk >>> John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK >>> If at first you don't succeed, delegate. >>> But I support unbloated email http://www.asciiribbon.org/ >>> >>> - > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc > Graphics (in well-used formats), large files, etc. can be posted to that URL. > > Website: http://www.ieee-pses.org/ > Instructions: http://listserv.ieee.org/request/user-guide.html > List rules: http://www.ieee-pses.org/listrules.html > For help, send mail to the list administrators: > Scott Douglas <[email protected]> > Mike Cantwell <[email protected]> > > For policy questions, send mail to: > Jim Bacher: <[email protected]> > David Heald: <[email protected]> > - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
