Peter, John, Your mutual but informative discussions on this topic almost make it seem that any intervention by an 'outsider' almost feels like eavesdropping. Almost. I haven't followed every twist and turn of your mutual discussion and so I hope I will not repeat what has been said before... OSM Decisions will only be incorporated into a CENELEC standard if someone >from the test lab proposes it to their national committee (together with a justification) and the national committee propose it to the relevant CENELEC Technical Committee. As regards to the next edition of EN 60950-1, I do not recall any OSM decisions being proposed as new Special National Conditions or 'A' Deviations, though this could be due to the untimely death of specific grey cells as I haven't looked back to check. One of the points I noticed in previous correspondence related to the use of MOVs. This is a topic that has received considerable debate in what was WG6 (the group that was responsible for the insulation requirements in IEC 60950-1 before all the various specialist groups were combined). As a consequence, requirements for using MOVs will be covered in the standard itself rather being left up to test house decisions (whether those labs be based in the USA or Europe). In this particular regard therefore, existing OSM decisions will no longer be required. Putting the above two paragraphs together creates an interesting situation. Currently, the OSM decisions on what is acceptable vary between national test labs. In order to include an 'A' deviation it is necessary to point to a national law, and the use of MOVs is likely to be far too technical to be covered by any laws - so no 'A' deviations on this topic. In order to include a Special National Condition it is necessary to cite some technical situation in the country concerned that is unlikely to change any time soon (examples include building wiring practices and climatic factors). Although some OSM decisions in this area may be justifiable on the grounds of compatibility with building wiring practice, not all are. Logically, a few national OSM decisions may need to change. Regards, Richard Hughes In a message dated 08/19/2004 16:16:49 GMT Standard Time, [email protected] writes:
Well, John, I can't help but chuckle. I'm left to wonder what form an OSM Decision will take once incorporated into EN 60950-1, when only six nations out of 28 members of CENELEC have a requirement. I mean no offense, but the coffee is so strong, I can smell it from across an ocean and a continent. Regards, Peter L. Tarver, PE [email protected] ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html 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
