I read in !emc-pstc that [email protected] wrote (in <OF5A3EC8B4.1EA5AC1B-ON48256E23.003417CB-48256E23.0035F992@OmniSourceAsi a.com.HK>) about 'Safety standard for LCD/PDP TVs' on Thu, 22 Jan 2004:
> How come a EN60950 compliant >SMPS is considered unsafe to EN60065? What are the major differences to >make the unit unsafe in TV mode? It seems the discussion exceeds the >technical nature and falls into logic nature. Any comments in this area >are appreciated. It's not logical, indeed, and the story is a complicated one. Neither TC92 (formerly responsible for IEC 60065) or TC74 (formerly responsible for IEC 60950) were responsible for the Basic standards on clearance and creepage distances, which are produced by TC28. The revisions of the TC28 standards (IEC 60664-X) which have led to the new reduced values, were long and controversial processes. TC74 adopted them at an early stage in the revision process, AIUI, but TC92 did not. IEC 60065 is under continuous review (as is IEC 60950) in the new(ish) committee TC108, which replaced TC74 and TC92, and there are two large amendments in process. I am not able to say whether the new clearance and creepage distances will be introduced or not. It depends to some extent on the progress of the integrated standard that will replace both IEC 60065 and IEC 60950. -- Regards, John Woodgate, OOO - Own Opinions Only. The good news is that nothing is compulsory. The bad news is that everything is prohibited. http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
