I believe it was spearheaded by the utility companies so they did not have to spend the money to adapt to the changing power needs of technology.
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Ralph McDiarmid Sent: Friday, May 22, 2009 1:16 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: RE: 120V mains voltage distortion Why did the members of the EU decide that harmonic currents needed to be controlled for appliances? I can see doing so might reduce the need to oversize the low-voltage distribution infrastructure to accommodate the increase in Apparent Power demand. Ralph McDiarmid, AScT Compliance Engineering Group Xantrex Technology Inc From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of John Woodgate Sent: Friday, May 22, 2009 5:03 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: 120V mains voltage distortion In message <275330ee7cbb894ab8775ffdee4bc85b3d10695...@na-exmsg-c118.redmond.corp.mi crosoft.com>, dated Thu, 21 May 2009, Ted Eckert <ted.eck...@microsoft.com> writes: >Distortion may not be just on the 120 V lines. I previously worked in >a building where the variable frequency drives (VFDs) for the >building?s cooling system were causing significant distortion on the >277/480 V lines. There was enough distortion that it carried through >to the 120/208 V system through the step-down transformers. The result >was that even on the lower voltage system, two of the three phases >showed flat topped sine waves. But the US sees no need to control harmonic currents to the extent given in IEC/EN 61000-3-2. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Things can always get better. But that's not the only option. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - 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 <emc-p...@ieee.org> 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 <emcp...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> - 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 <emc-p...@ieee.org> 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 <emcp...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - 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 <emc-p...@ieee.org> 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 <emcp...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
