Having looked into EN61000-3-11, there is a big difference from EN61000-3-3. The scope of 3-3 refers to products rated 16 amps or less "per phase". There is no per phase specification in EN61000-3-11. Only this in the title: equipment with rated current <75 A. Further, the scope does not specify that as a per phase rating.
I would say that the standard does not apply to any product with a total rating >75A. That would allow 3 phase products rated greater than 25A per phase to fall outside the scope of EN61000-3-11! regards David Spencer Xerox Corp. -----Original Message----- From: John Woodgate [mailto:[email protected]] Sent: Wednesday, October 30, 2002 9:12 AM To: [email protected] Subject: Re: EN61000-3-3 & -3-11 I read in !emc-pstc that [email protected] wrote (in <39082109301020 02/A00813/MULDER/120AF2550700*@MHS>) about 'EN61000-3-3 & -3-11' on Wed, 30 Oct 2002: > >G'Day! > >Anybody know if EN61000-3-3 (fluctuations & flicker for equipment >drawing <16A) will be *replaced* by EN61000-3-11 (fluctuations & flicker >for equipment drawing <75A) on 1st Dec 2003? > >Or are the scopes different and hence both will exist? > The scopes are different. EN 61000-3-3 is for 'ordinary' equipment rated below 16 A/phase. EN 61000-3-11 is basically for equipment rated between 16 and 75 A/phase, but it can also be applied to (rare) equipment below 16 A that cannot meet the limits in 61000-3-3 with a supply of source impedance equal to the IEC 60725 (under amendment***) reference impedance (0.4 + j0.24 ohms for a single phase supply). Such equipment has to be connected only to supplies of lower impedance (and therefore higher service rating than the usual household supply, of service rating 100 A). If the impedance is low enough, the limits can be met. It is thus, in one sense, impossible to fail EN61000-3-11; you just have to specify a sufficiently 'stiff' supply. Of course, the electricity suppliers probably won't want to provide LV supplies of 600 A service rating just to accommodate your product that periodically crowbars the incoming supply. (;-) *** The amendment does not alter the value of the reference impedance. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! ------------------------------------------- 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: 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://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" ------------------------------------------- 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: 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://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
