In message <[email protected]>, dated Thu, 13 Nov 2008, Robert F. Keller <[email protected]> writes:
>I have a question regarding the Electric Strength test in 60950-1 >section 5.2. It says in that section that you have a failure or the >insulation broke down when the current which flows as a result of the >application of the test voltage rapidly increases in an uncontrolled >manner. So, is there an exact current limit at which it is considered >to have "shorted"? No. The whole point is that it's the uncontrolled rise, not a specific current, that indicates breakdown. It may not be a 'short' in the sense of a very low resistance. It's sufficient that, for example, insulation that was 100 Mohms has degraded to 1 Mohm, because it would almost certainly continue to degrade over time even without the high voltage being present. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Either we are causing global warming, in which case we may be able to stop it, or natural variation is causing it, and we probably can't stop it. You choose! 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
