In message <002901c856f2$e128c900$c600a8c0@PC323541548743>, dated Mon, 14 Jan 2008, [email protected] writes:
>For typical failure modes, contact your Y-cap manufacturer. Failure >modes are likely unique to each manufacturer. But the fundamental point is that if the insulation is punctured, e.g. by a high-voltage spike, the metal film vaporizes around the puncture. Now this applies when the cap is line-to-earth, if it's line-to-accessible part, there MAY, in theory, not be enough current when the spike occurs to clear the fault in that way. Whether any such case has actually occurred is another matter. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk For very important information, please turn over. 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
