220....221..... Whatever it Takes.
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Wednesday, March 21, 2012 11:45 PM To: itl-emc user group; [email protected] Subject: Re: [PSES] Mains voltage in Europe These voltages, and more, all exist today. It depends on the system to which you are connected. The 110 is from a 220 split phase feed. Often this is from of a secondary of a delta connected transformer. Normally 120v is derived from a 208v three phase wye system. It is from one of the phases referenced to earth (neutral); 120 x sqrt(3) = 208. Using vector diagrams you can discover many of these relationships. Some of these diagrams are referenced in 60664 based standards. Over the years there have been many arguments over which voltage and frequency, is the "correct" one. There's even some proponents for using DC power exclusively. Aviation and some naval systems operate on 400 hz. I suspect this is a discussion that will never end. Doug Douglas E Powell http://www.linkedin.com/in/dougp01 Sent from my Verizon Wireless BlackBerry -----Original Message----- From: itl-emc user group <[email protected]> Date: Thu, 22 Mar 2012 03:20:11 To: <[email protected]> Reply-To: itl-emc user group <[email protected]> Subject: Re: [PSES] Mains voltage in Europe After all this discussion, Does anyone know the Mains Voltage in the US. It was once 110 VAC and then 115 VAC. I heard that now it may be 120 VAC Any info would be helpful -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of John Woodgate Sent: Wednesday, March 21, 2012 10:48 PM To: [email protected] Subject: Re: [PSES] Mains voltage in Europe In message <[email protected]>, dated Wed, 21 Mar 2012, Brian Oconnell <[email protected]> writes: >I see minimal politics in EMC or safety standards - so they are a >technical standard. You should be there! In EMC, PLT is pure politics, but there are more subtle examples. In fact, 'politics versus engineering' is the wrong way to look at the subject. It's better looked at as 'economics versus technology', and standards committees are increasingly being 'encouraged' (coerced) into addressing economic questions that they are not trained, and not empowered, to answer, thus bearing the blame when everything goes pear-shaped. PLT is an obvious case; if it can be made to work, it could generate gigabucks, some for private enterprise and 20% at least as tax for governments. But at the technology level, it can only be made to work by inconveniencing amateur radio operators, who don't have enough votes to matter. >I see significant 3d and 4th party agenda influence on the >environmental standards - so they can be considered political >standards. So I would like to know what are/were the exogenous >influences on the EU distribution systems that made it a political >voltage? OK, you did ask! The European Commission decided that, like water, natural gas and fuel, electricity is a 'commodity' and thus needs 'quality at the point of delivery' regulations just as the others have. However, while, in principle, a simple 'non-return valve' prevents users from contaminating the other three, users are adept at contaminating the electricity supply with harmonic currents and load current changes that propagate voltage changes through the network, and no 'no-return valve' analogue exists. Also, straying trucks and trees, and wind, rain and snow, affect electricity supplies much more than the others. So the electricity suppliers negotiated EN 50160, a 'quality standard' for electricity. It's not really a standard in the usual sense, because it has so many 'ifs', 'unlesses' and 'excepts' etc. that conformity to it is not very meaningful, but it is a 'political standard'. Even so, nothing much better can be done. Included in it is '230 V +/-10 %'. -- 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 'QWERTY' is an English keyboard, what language is 'WYSIWYG' for? - ---------------------------------------------------------------- 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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]> ________________________________ 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 <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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]>
