In message <001201c7c3ee$89cc2a40$6a01a8c0@PC323541548743>, dated Wed, 11 Jul 2007, rn...@san.rr.com writes:
>Any other reasons why insulation resistance would decrease with time in >use? Well, that's more or less my point. If it starts at 100 Mohms, but after just a year it can be as low as 1 or 2 Mohms, that pass criterion is just too low, in my opinion. Surface deposits (e.g. damp salt solution - salt gets everywhere, even in the middle of a continent) may degrade IR a bit, but not two orders of magnitude! If the IR really HAS dropped from 100 Mohms to 1 Mohm, then it's been thermally or chemically degraded or was made of poor stuff. Either way, it's bad news. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk There are benefits from being irrational - just ask the square root of 2. 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 emc-p...@ieee.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...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
