In message <of04b1dbb7.f0823b58-on86257603.004d1c8c-86257603.004e8...@amat.com>, dated Thu, 30 Jul 2009, lauren_cr...@amat.com writes:
>Any ideas on the rational behind this difference? This sort of difference came to light in the development of the projected IEC 62368 safety standard. It's a very complex subject if you go into it deeply, and one significant factor is exactly how a person may contact the live parts. You can see, in an extreme case, that contact with two rounded pins, 5 mm apart, by a single finger-tip is likely to be far less hazardous than both-hands contact with two large surfaces, and a higher voltage can therefore be allowed. Partly for this reason, and partly because some standards were written without full co-ordination with others, there are many such discrepancies. Obviously, they should all be amended, where necessary, so as to be consistent, but.... -- 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>
