Your most sacred guidance is found in sections 4.3 and 11 of 60065, the excerpts sayeth:
When a specified fault condition test is carried out, it can cause consequential faults which either interrupt or short-circuit a component. In case of doubt, the fault condition test shall be repeated up to two more times with replacement components in order to check that the same result is always obtained. Should this not be the case, the most unfavourable consequential fault, whether interruption or short circuit, shall be applied together with the specified fault condition. When the apparatus is operated under fault conditions, no part shall reach such a temperature that: - there is a danger of fire to the surroundings of the apparatus; - safety is impaired by abnormal heat developed in the apparatus. luck, Brian > -----Original Message----- > From: [email protected] [mailto:[email protected]]On Behalf > Of Scott Xe > Sent: Wednesday, July 18, 2007 7:49 AM > To: [email protected] > Subject: Carbon film resister acts as fuse to avoid temp rise > > > I recently evaluated an audio product. During fault > condition test, I > short-circuited an electrolytic capacitor in power supply > unit and found two > small-value carbon resistors in series with a group of > output windings of > the isolating transformer and rectifier circuitry burned out > in a couple of > seconds. I repeated it several times and it worked reliably. I am > wondering if this method is deem to be acceptable as a > reliable means to > prevent overheating. Any different comments about such > means of protection? > > Thanks and regards, > > Scott - 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 ______________________________________________________________________
