I read in !emc-pstc that POWELL, DOUG <[email protected]> wrote (in <[email protected]>) about 'Bad Fuse vs. Good Fuse' on Fri, 23 May 2003:
> Recently, in my company, we've been discussing what exactly constitutes a > good or bad fuse. In this industry we often hear that the trouble with a > defective product was, "the fuse was bad." I occurred to me that the fuse > is not bad, it performed exactly intended. In fact if the problem that > caused the fuse to "operate" is still present, then the fuse is still good > even though it is now an open circuit. The only time it can be a bad fuse > is if it did not operate, resulting in shock or a fire. There are two cases where a fuse really is 'bad': - it goes open-circuit in spite of its fusing current/time not having been exceeded; - its resistance changes from milliohms to ohms, perhaps varying. I agree that a fuse that has failed when it should have is not 'bad', but it's notoriously difficult to stop people using bad terminology. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
