Hi Joe: An excellent question !
Let me ask one or two of my own here. 1. Are we sure that both Sweden and Norway are currently EU members ? Not just IEC members ? Regardless of that answer the question really remains valid for the other items in annex ZB 2. Would it be reasonable that these National Requirements are only applicable when getting a National Approval, and that they are not applicable to CE marking and compliance with the EN standard ? I hope to see a lot of opinions, this should be interesting. Richard Payne MBD Product Safety Engineering Tektronix, Inc. v (503) 627-1820 f (503) 627-3838 e richard.pa...@tek.com > -----Original Message----- > From: j...@aol.com [SMTP:j...@aol.com] > Sent: Wednesday, August 19, 1998 9:17 AM > To: emc-p...@ieee.org > Cc: t...@world.std.com > Subject: CE marking vs. Annex ZB in EN60950 > > I am trying to sort out an an apparent contradiction between the main body > of > the "harmonized" EN 60950 and the national deviations that appear in Annex > ZB. > I would appreciate some assistance from the safety professionals and > regulatory experts in the emc-pstc and treg forums. > > My particular problem has to do with the specified insulation between > between > TNV-3 circuits and SELV circuits, although the question about Annex ZB > applies > to other national deviations as well. I will use the TNV/SELV issue as an > example. > > Clause 6.2.1.2 of EN 60950 specifies basic insulation between TNV-3 and > SELV > circuits. However, in Annex ZB, it states that Norway and Sweden require > supplementary insulation. Annex ZB states that "for the countries in > which > the special national conditions apply, these provisions are normative. > For > other countries they are informative." > > I am trying to understand how this distinction is applied for CE marking. > I > thought that the intent of CE marking was that products could be evaluated > against "harmonized" standards and then have the CE marking applied. I > thought that products with the CE marking were allowed to move freely > among > the member countries in the EU. Annex ZB seems to complicate this simple > interpretation. > > My tentative conclusions about the above situation are: > > 1) A manufacturer who intends to market his product in a list of EU > countries > that excludes Norway and Sweden can apply the CE marking to a product that > has > only basic insulation between TNV-3 and SELV circuits. > > 2) A manufacturer who intends to market his product in a list of EU > countries > that includes Norway or Sweden can only apply the CE mark if the product > provides supplementary insulation between TNV-3 and SELV circuits. > > The above two cases result in products that each bear identical CE > marking, > but one of them (case 1) is technically illegal for use in Norway and > Sweden. > From looking at the product marking, there is no way to determine that the > product in case 1 should not be used in Norway or Sweden. > > I suppose that this distinction could be made in the user manual. I also > presume that the manufacturer in case 1 would be obligated to ensure that > the > product is not offered for sale in Norway or Sweden. Maybe this is enough > to > comply with the letter of the law, but I suspect that it would be easy for > the > product in case 1 to find its way into Norway and Sweden. > > Prior to the adoption of CTR 21 for analog modems, the above issue was > largely > academic, since individual national approvals and the corresponding > national > labels were still required for connection to the PSTN. > > However, now that CTR 21 has been adopted, I expect there will be a rush > toward "full" CE marking (including the crossed hockey sticks) of analog > modems. National approval labels will no longer be required. I think > this > will bring additional attention to the situation I have described above. > > Can anyone offer some some insight into how this situation should be > handled? > Is my interpretation correct? Any comments would be welcome. > > > Joe Randolph > Telecom Design Consultant > Randolph Telecom, Inc. > 325 Highland Avenue > Winchester, MA, USA 01890 > 781-721-2848 (voice) > 781-721-0582 (fax) > > > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to majord...@ieee.com > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to ed.pr...@cubic.com, > ri...@sdd.hp.com, or roger.volgst...@compaq.co (the list > administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.com with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, ri...@sdd.hp.com, or roger.volgst...@compaq.co (the list administrators).
