In message <d7f689491d38d61189ba00508baf1271085d8...@nl0006exch005u.nl.lucent.com>, dated Tue, 2 May 2006, "Mak, L (Leen)" <[email protected]> writes >Condition A refers to the two lines which mention thickness and which >are indeed mutually exclusive. >Condition B refers to the line mentioning to the 100 mm.
Ah, if condition B is the 100 mm requirement, then your point is made. > >>> It is necessary to be VERY careful when changing a text >>> that includes >>> 'or' and/or 'and' from positive to negative or vice versa. > >I must confess that I do not know antyhing about HB material, but that >I did study proposition logic. This branch of mathematics provides the >tools needed to handle these kind of issues. My email was not intended >to make any statement about what is HB or what isn't, it was only >intended to warn that the text quoted from UL60950, Third Edition, >A.8.5 Compliance criteria is not equivalent to the text quoted from Cl. >7.1 of the 5th edition of UL94: 1997. Yes, and UL 94 is correct; UL60950 isn't. Curiously, a similar case arose in amending IEC 60065, and I had to use the same argument to demonstrate the proposition 'A OR B = NOT A AND NOT B'. The texts in question may in fact have had the same author, who has now retired. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk 2006 is YMMVI- Your mileage may vary immensely. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
