I read in !emc-pstc that Rich Nute <ri...@sdd.hp.com> wrote (in <200208232012.naa27...@epgc264.sdd.hp.com>) about 'electric strength test' on Fri, 23 Aug 2002: > > > >Hi John: > > >> True SELV ..... requires double or reinforced insulation from hazardous >> live parts/parts at hazardous voltages [different expressions used for >> the same things] and basic insulation from earth. '950 SELV' allows SELV >> circuits to be earthed (see 2.2.3.3 of IEC60950:1999 or EN60950:2000 or >> of IEC/EN 60950-1). > >Why does "True SELV" require basic insulation >between SELV and earth? > >What is the hazardous voltage source, and what >is the current path through the body if that >basic insulation should fail? > >This is a question that has bothered me for a >number of years. > > [AOL] Me too [/aol]
You would have to ask the people who originated SELV. -- 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: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
