Bob -
You're quite right that the proposed test constitutes a multiple fault condition and is not supported by any UL standard that I am aware of. I have never had any agency request blocking of all equipment ventilation openings. UL HK should provide you with a rationale for this testing and the issue can certainly be referred to a higher authority within UL if there is disagreement. The only time a more onerous test method should be used is with the agreement of the customer (you or your customer), with the understanding that a noncompliant test result would not necessarily indicate noncompliance with the standard. Regards, Peter L. Tarver, PE Product Safety Manager Homologation Services Sanmina-SCI Corp. 2000 Ringwood Ave. San Jose, CA 95131-1749 V: 408-904-2081 F: 408-904-2095 M: 408-234-3529 [email protected] > From: Robert Johnson > Sent: Tuesday, November 25, 2003 7:56 AM > > I have been requested by UL-HongKong to the blocked > ventillation abnormal testing with all vents on all side > blocked simultaneously. My previous experience > has been that > one side is blocked at a time. Blocking more than > one side at > a time was considered multiple faults. If it > passes blocking > all vents at once shortens test time, but is this method > necessary? > > What is the experience of others? > > Bob Johnson > ITE Safety This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
