I read in !emc-pstc that Rich Nute <ri...@sdd.hp.com> wrote (in <200305230123.saa09...@epgc264.sdd.hp.com>) about 'Safety testing after equipment repair' on Thu, 22 May 2003:
>Some years ago, I undertook a test to determine when >an insulation would fail if subjected to a continuous >hi-pot voltage. I connected several units to the hi-pot >voltage for 8 hours/day. The units started failing >after about 10 days. That would be about 48,000 minutes. I don't think you can draw universal conclusions from just one experiment. In addition, the rate of increase of voltage is limited in the test procedures. In your experiment, there was only one increase of voltage, whereas in repeated testing, there are many. At best, we don't know if that matters or not. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
