Supposedly, since the ratings are specified in the standard, they must involve safety if not done according to the standard. So, what is the safety issue if the ratings are not in accordance with the standard? What is the injury?
What is the safety issue if the applied voltage is less than or more than the marked ratings but still within the nominal from the electric power utility? Again, what is the injury? Rich > -----Original Message----- > From: John Woodgate > [mailto:jmw1...@btinternet.com] > Sent: Friday, April 07, 2017 9:11 AM > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: Re: [PSES] Voltage Rating vs Voltage > Specification > > 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.McDiarmid@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>
