If there were no standards notified bodies would benefit greatly. Ed made his mistake with no malicious intend. Standards infer presumption of conformity. They are listed in the OJ with reference to the pertaining directive. I read this the other way around, standards may very well not be sufficient or incorrect, in which case the essential requirements of the directive either supplement or replace the standard. They are however a means of fair commerce. Standards are the consensus opinion of the experts in the field. (I prefer using standards over the holy water approach to safety). If you have an issue with a standards try to participate in its making.
Standards play a specific role in some directives, the EMC and TDD come to mind, where their absence or incompleteness requires the manufacturer to choose conformity routes that invoke involvement of "notified bodies" such as TUV or FIMKO. Hence my remark in the first sentence. National Law, into which directives are implemented, may indeed exceed the scope of the directive as long as no conflict arises. Here in the US the role of standards seems greater then in the EU (considering what we just said about at least the LVD) that makes for a very interesting scenario for an MRA. Best regards to all Matthias R. Heinze TUV Rheinland -----Original Message----- From: Towner, Richard C. [SMTP:[email protected]] Sent: Friday, November 13, 1998 12:50 PM To: Edward Eszlari Subject: Re: Low Voltage Directive (73/23/EEC) I'm going to have to correct you on the first statement there, Ed. The Low Voltage Directive does not specify what standard should be used, ever. In fact, it never mentions any standard by name or number, ever, outside of general references to harmonized, international, and national standards, all of which can be superseded by a report from a notified body under Article 8. To suggest that "the directives specify standards that apply to your equipment" is gross and negligent misinformation, a disservice to the person asking for the information, and in the case of your company, a self-serving message. You may be right about your information in the standards, but you're dead wrong about your information on the Directives. Being from TUV, you should know better. Rick Towner ---------- From: Edward Eszlari To: treg Subject: Re: Low Voltage Directive (73/23/EEC) List-Post: [email protected] Date: Thursday, November 12, 1998 9:52AM Doug, What you are missing is that the directives specify standards that apply to your equipment. We have to base our answer on the standard, which in this case sounds like ITE (950). Regardless of the input voltage, we still must consider the following: * How is the equipment isolated from the TNV? 950 para. 6 describes the requirements. * Could there be a component fault that would cause an unsafe condition or shock hazard? * What about component overheating? Are all components rated for the minimum temperature / voltage that they will see in normal and abnormal use? I can tell you that all of my customers require certification for products operating at a nominal 48 VDC. I also certify products that operate from 5VDC......just look at your computer mouse and keyboard. Hope this helps you understand what the standards are about. Regards, Edward Eszlari TUV Rheinland of N.A., Inc. Marlborough, MA 508-460-0792 > >The Low Voltage Directive (73/23/EEC) applies to >equipment that operates from supply voltages of >50-1000Vac or 75-1500Vdc. > >Does this mean that strictly according to the >standard *in and of itself*, that is according >to 73/23/EEC by itself, safety testing need NOT >be applied to ANY piece of equipment that operates >from 48vdc in a Central Office? > >Specifically, say a piece of equipment in the rack >that does not touch the E1 line? > >What am I missing here ... > > ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com
