I read in !emc-pstc that Alexandru Guidea <[email protected]> wrote (in <[email protected]>) about 'Dielectric withstand voltage for power supplies' on Thu, 26 Jun 2003:
>Being interested by the subject, I followed closely this thread. Found >pertinent comments and also a very impolite one like "This appears to be a >case of not reading the standard. Please buy a copy and read it." This last >one comes in flagrant contradiction with the other emails and with the >professionalism of this forum. I do not agree. The comment is very pertinent (it may be impertinent, simply through terseness, as well). If one relies on information from mail list messages, one has a good chance of copying other people's mistakes. Where safety is concerned, this is unacceptable. > >I would raise the question about how a power supply with only basic >insulation between input and output is suitable for PCs with male D-subs, or >for PC headphones which are not isolated for 1500V rms. Well, now; do you suppose that this point isn't dealt with in the standard? Accessible circuits that have no connection to the protective earth conductor require double or reinforced insulation from the mains supply. But don't take my word for it, please read the standard and reassure yourself. -- 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: [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] 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
