Tom and everyone The purpose of Annex ZA in parallel-voted CENELEC standards is to control the way in which referenced documents are applied.
Parallel-voted EN standards are based on IEC or CISPR standards and may, or may not, differ from the international version. Differences are called "common modifications" in the EN. Annex ZA ensures that the EN version is used where it exists, and (usually) that a specific edition is referenced. If there are any common modifications, only the EN will provide the correct requirements. The body text of the EN is unchanged from the international version, so the international reference appears within the standard. To ensure that you use the correct version, you must use the referenced documents in the two right-hand columns (standard and date) of the table in Annex ZA, where included. In some cases, there is no EN equivalent, and these columns are blank for that standard, for example the reference to IEC 60083 in Annex ZA to EN 55022:2006. However the IEC standard is referenced by date (1997) so that is the edition that has to be used. For EMC standards in Europe, dated references are preferred. Standards are produced by many different committees, and some may have chosen undated reference to ENs. But if the right-hand column of Annex ZA has a date, that is the edition you have to use. For those not familiar with CENELEC Guide 25, it (and Guide 24) are available for free download from the CENELEC website at http://www.cenelec.org/Cenelec/CENELEC+in+action/Horizontal+areas/EMC/defaul t.htm I hope this helps. Best wishes Brian Brian Jones EMC Consultant Secretary to CENELEC TC210 From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of T.Sato Sent: 11 December 2006 11:32 To: emc-p...@ieee.org Subject: dated or undated reference to EN standards Hello, I'm slightly confused with (apparently dated) reference to EN standards which corresponds to undated reference to IEC standards. In Annex ZA (list of normative references) of EN standards, years are sometimes written for EN standards which corresponds to undated IEC standards, with a comment "Valid edition at date of issue". I think this comment suggests that the year is written there for informative purpose, and the reference may be still "undated". The annex usually includes a phrase "When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.", and I think this suggests that, at least for standards which were not modified, we can use the undated IEC standards anyway. However, in CENELEC Guide 25 Annex 3, 2 c), I read: When there is a directly corresponding edition of CENELEC (mostly EN) to the international standard and that international reference is undated, the annex Z gives the indication of the latest valid corresponding CENELEC document (mostly EN) with its date. Important remark: In this last case, the undated international reference becomes de facto dated for European use. ... Can anyone here clarify whether reference to EN standards as mentioned above are dated or undated? Regards, Tom Tomonori Sato <vef00...@nifty.ne.jp> URL: http://homepage3.nifty.com/tsato/ - 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 emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - 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 emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
