In message <[email protected]>, dated Wed, 18 Jul 2007, Scott Xe <[email protected]> writes:
>I am wondering if this method is deem to be acceptable as a reliable >means to prevent overheating. Indeed, it does work, but unfortunately it's normally acceptable only if the resistors are specified as 'fusible resistors'. The reason is that, if they are just ordinary resistors, those from some manufacturers will fail open circuit without problems whereas others may burn up and burn the printed board. Some test houses consider that they have discretion to accept resistors of specified types that do always fail open-circuit without significant burning. -- 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 [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 ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
