There are in fact two IEC resources, Electropedia, which has all the formal definitions produced by TC1 and Glossary, which has a selection of terms, culled from many standards, that have not been adopted by TC1.
http://www.electropedia.org/?ref=extfooter http://std.iec.ch/glossary?ref=extfooter Neither can be comprehensive at one instant, because new terms are being added all the time. With best wishes DESIGN IT IN! OOO – Own Opinions Only www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England Sylvae in aeternum manent. -----Original Message----- From: Ralph McDiarmid [mailto:ralph.mcdiar...@schneider-electric.com] Sent: Friday, April 7, 2017 4:42 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Voltage Rating vs Voltage Specification Pete, I wonder if the onus to define the terminology like “rated voltage” should really be on the technical committees, not academia. I know that is some standards, terms like "disconnect" and "trip" are loosely defined. I wonder if there should be one IEC document, which could serve as a reference to all others for terminology. I think there is one, but it is likely not comprehensive. Ralph McDiarmid Product Compliance Engineering Solar Business Schneider Electric From: Pete Perkins [mailto:00000061f3f32d0c-dmarc-requ...@ieee.org] Sent: Thursday, April 06, 2017 10:20 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Voltage Rating vs Voltage Specification All, Yes, the consultant or safety engineers dream/nightmare. We have to realize that the glass is half empty for most of the world and we have an ongoing opportunity to strike them across the knuckles with a ruler (as the nuns did in primary school) and begin the teaching mode. As PT Barnum (the American circus entrepreneur) once said (and quoted often) ‘There is a fool born every minute’. If the technical schools provided all of this detailed training we wouldn’t have anything to do. So fill your peddler’s sack with all of these important stories and smile, but not laugh out loud, when you run into the same situation again (and again, and again). Every project and every design team is an opportunity to straighten out the world. :>) br, Pete Peter E Perkins, PE Principal Product Safety & Regulatory Affairs Consultant PO Box 23427 Tigard, ORe 97281-3427 503/452-1201 mailto:p.perk...@ieee.org From: john Allen [mailto:john_e_al...@blueyonder.co.uk] Sent: Thursday, April 6, 2017 12:57 AM To: mailto:EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Voltage Rating vs Voltage Specification As Dave said, this is “age old problem” that we also faced at HP Bristol in the 1980s when we built peripherals that had to operate across the World – and that meant from 100V 50 & 60Hz in Japan and up to 240V 50Hz for the UK and a few other places, AND +/- to cope with the relevant required local tolerances (and so effectively meant +/- 10% across the board). This meant careful selection and testing of PSUs and of the ratings to be marked on the end-use products, but fortunately most of our products did not have directly mains-powered motors. In practice, if you have a product that does have such motors then it may well mean that you need to produce separate models with different motors for the geographical areas that operate at the extremes of the voltage/frequency ranges – especially those at the lower end thereof – or else change the designs to use DC motors supplied from full voltage/frequency range-capable PSUs (or, possibly, use AC motors rated for the lowest “worst case” voltage/ frequency / tolerance combination, but with solid state control systems which ensure that those motors are operated within that regime regardless of the actual supplied mains voltages/ frequencies/ tolerances?). OTOH, the latter approaches are probably impracticable in most cases for cost /space /weight / technology reasons , and so that means you need a “horses for courses” approach. John E Allen W. London, UK - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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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.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://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
