At 07:31 AM 5/24/2006, Peter Todd wrote: >Interesting, I've seen references to "1000V 1minute" tests that wall >warts have to pass to be UL listed. I always thought it was purely a >function of don't burst into flames... Now I see why the 1 minute part >of the test is important! I don't know of ANY wall-wart that will survive 1000Vac applied to the primary for 1 minute. I *think* that you are thinking of a standard hi-pot test between primary and secondary. We have 2 options when we do hi-pot testing: 1KV (or 1.2KV - don't recall) for 1 minute or 2500 Vac for x number of seconds (also don't recall the specifics). We use the lower voltage, longer duration test when we are dealing with semiconductors that might be damaged by 2500 Vac. dwayne -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 22 years of Engineering Innovation (1984 - 2006) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist