http://www.ieee-pses.org/symposium http://www.emc2004.org/
source: http://www.jpn.tuv.com/jp/en/se vices/product_testing/emc_services/emc_faq.html What is a public low-voltage distribution system ? Public low-voltage distribution systems, especially as referred to in EN 61000-3-2:1995 and EN 61000-3-3:1995, are power supply systems allowing the direct connection of equipment with rated voltages between 200 and 260V (single phase or phase to neutral for three phase systems) or between 340 and 450V (phase to phase in case of three phase equipment). Higher voltage distribution systems, which are connected to power substations, are not considered to be public low-voltage systems in the above sense. source: http://www.ce-mag.com/archive/01/07/ramie.html Equipment used on a site that has its own dedicated MV-to-LV transformer (such as most high-rise buildings, hospitals, or factories) and not intended to be connected to a public supply (public is defined as shared between more than one organization or household). Two possible approaches that I can recommend: 1) Take necessary design measures to comply with and declare compliance with 61000-3-2. 2) Justify that your equipment is outside the scope of the standard, since it is not intended to be connected to the PUBLIC low-voltage distribution system (using the CE-mag definition). Under this approach you would not declare compliance with EN 61000-3-2. I do strongly recommend that you provide text in your installation guide which states: 1. That your professional equipment is intended for connection only to non-shared power distribution systems with dedicated MV-to-LV transformers. 2. User is required to ask the supply utility for permission to connect prior to connecting to (shared) public low-voltage distribution systems. My understanding is that industrial users are commonly monitored by the utility and subjected to tariffs for low power-factor. Douglas G. Frazee Lucent PSAX Compliance Manager [email protected] From: Borowski, Ron [mailto:[email protected]] Sent: Tuesday, August 17, 2004 6:24 PM To: [email protected] Subject: 61000-3-2 Applicability http://www.ieee-pses.org/symposium http://www.emc2004.org/ Dear List members, I am trying to determine if our products fall under the scope of IEC/EN 61000-3-2 and am seeking your comments/advice in that regard. We manufacturer electro-mechanical products that control register, color, and other process parameters on commercial web-offset printing presses. These are auxiliary industrial control devices. The input current and voltage ratings of the products fall within the scope of the Standard. These products are not on the open market and are not sold to the general public. They can only be obtained by commercial printing companies and only through our sales department. Typically, in a large printing plants (where our products are installed), the supply utility brings in a very high power source or sources. Then, distribution and step-down is done within the plant via the plant's own switchgear & controlgear. Thus, my line of thinking is that our products are not connected to the "public low-voltage distribution system" described in the Standard's Scope - Clause 1. So, using that logic, I'm now wondering if our products are excluded from the 61000-3-2 requirements. If not, the 2nd paragraph in Clause 4 seems to provide an exception for "Professional Equipment". I do believe our products would fall under the definition of Professional Equipment provided in 3.15. Although, I could also say the same for certain Medical Devices, Test Equipment, Motor Drives, and many other electrical devices. We'd prefer to not have to instruct our users in the instruction manual to "ask the supply utility for permission to connect". When considering the typical plant power scheme, I wonder if the printing plant is actually it's own supply utility. If that's the case, then the statement in the instruction manual wouldn't provide much value because the user would essentially have to ask himself for permission to connect. Has anyone else run into this dilemma or am I just missing something? What is the group's opinion on whether or not our products (described above) must comply with the requirements of 61000-3-2? All comments/feedback will be welcomed. Thanks in advance. Ron Ron Borowski Product Safety QuadTech A Subsidiary of Quad/Graphics Sussex, Wisconsin USA +1 414 566 7976 tel +1 414 566 9576 fax [email protected] www.quadtechworld.com This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. IEEE PSES Main Website: http://www.ieee-pses.org/ To post a message send your e-mail to [email protected] Instructions for use of the list server: 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 This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. IEEE PSES Main Website: http://www.ieee-pses.org/ To post a message send your e-mail to [email protected] Instructions for use of the list server: 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
