Having worked at UL for many years in ITE, and having been the UL seminar leader for ITE for several years, blocking vents during on one side only was always the rule/what we taught = one fault at a time. Of course the years have been adding on since my days at UL so things may have changed. I believe UL still publishes their "interpretations" for ITE and most likely have one written on this topic = I think the last I heard they called them "practical application guides" or something like that. I believe they sell this on their web site and may allow access to those with "subscriber service" for UL60950.
Having worked in many other standards/categories in addition to ITE, some standards (especially appliance standards) require normal temperature testing in the corner of an alcove which can result in vents on 2 sides being fully or partially blocked (alcove = black walled test corner). Regards, Bill Bisenius E.D.& D. [email protected] -----Original Message----- From: Robert Johnson [mailto:[email protected]] Sent: Tuesday, November 25, 2003 10:56 AM To: [email protected] Subject: Blocked ventillation testing 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 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
