At least for 60950-1, this should be considered a multiple fault; unless the intended end-use installation indicates a "mechanical" situation where all vents blocked could be considered a SFC.
I am not aware of any National Differences that would allow this test condition. If UL is acting as an NCB, there might be a CTL decision that would indicate otherwise. luck, Brian -----Original Message----- From: Robert Johnson [ mailto:robe...@rcn.com] Sent: Tuesday, November 25, 2003 7:56 AM To: emc-p...@majordomo.ieee.org 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
