I read in !emc-pstc that William D'Orazio <[email protected]> wrote (in <[email protected]>) about 'EN61000-3-2,3', on Tue, 28 Aug 2001:
>My understanding of EN61000-3-2,3 is that they are applicable to the >power input terminals of equipment intended to be connected to systems with >240/415-250/430V operating at 50-60Hz. Therefore if 480 V is supplied to a >building, with a local transformer to step the voltage down to 400V, is the >equipment operating within the building exempt from these standards. That situation simply does not occur AFAIK. But if it did occur, the standards might not apply, but that is far from certain. Not that you are likely to be able to buy equipment that doesn't conform at present, designed exclusively for use in the situation you describe. > What >if the HV transformer that steps down HV-480V supplies other buildings as >well, are we still exempt from the requirements of this standard. It is true that the standards apply only to **public LV supplies**. If you have a site with its own MV or HV/LV transformer (not a 480/400 V transformer, which is LV/LV), **not supplying any other customer of the utility**, then you have private LV supply and you only need to meet IEC/EN61000-3-6 guidelines at the MV or HV terminals. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Eat mink and be dreary! ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [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: No longer online until our new server is brought online and the old messages are imported into the new server.
