Any single fault that could possibly result in a shock hazard and/or a fire hazard should be fault tested. Close analysis of the electrical schematic can help determine which faults could raise voltage levels in accessible circuits above the shock hazard level and/or are located such that they could result in fire (more specifically, fire outside the product enclosure). In general: Fault resistors open, Fault capacitors short, Fault diodes short Regards, Bill Bisenius bi...@productsafet.com E.D.& D. www.productsafeT.com <http://www.productsafet.com/>
From: Van Compernolle, Eric [mailto:eric.vancomperno...@barco.com] Sent: Thursday, October 23, 2003 10:41 AM To: 'emc-p...@ieee.org ' Subject: Fault condition test UL 60950 Dear all, For the fault condition test ( single fault) you have to consider the risk on an open or short of a component. My question is the following: do we have to consider both a short and an open of a (film) resistor? Normally I should think that the only way that a fault can occur on such a resistor is an open. Do we have to consider also a short? The same question for a capacitor ( normal fault condition: short?) and diode (normal fault condition: short?). best regards, Van Compernolle Eric Reliability Manager Barco Projection System Noordlaan 5 Industriezone B-8520 Kuurne Belgium Tel. +32(0)56 36 82 11 Fax.+32(0)56 36 83 55 E-mail: eric.vancomperno...@barco.com - - - - - - - DISCLAIMER - - - - - - - - Unless indicated otherwise, the information contained in this message is privileged and confidential, and is intended only for the use of the addressee(s) named above and others who have been specifically authorized to receive it. If you are not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this message and/or attachments is strictly prohibited. The company accepts no liability for any damage caused by any virus transmitted by this email. Furthermore, the company does not warrant a proper and complete transmission of this information, nor does it accept liability for any delays. If you have received this message in error, please contact the sender and delete the message. Thank you.
