I read in !emc-pstc that [email protected] wrote (in <LFENJLPMMJB [email protected]>) about 'Power Factor Correction - Power supply unit', on Thu, 31 Jan 2002: > >Hi all, > >An AC/DC power supply (230AC in / 28VDC 3A out) shall power an ITE (fire >alarm panel). I assume that EN61000-3-2 will apply for the total system >(Power supply + ITE).
Yes. >I was told that the power supply must have Power Factor Correction in order >to pass the harmonic EN61000-3-2 test. > Not necessarily. The ***Class A*** limits apply, not the Class D. This is possibly the most significant change introduced by the Millennium Amendment (A14). Class D applies now to PCs, VDUs and TV sets, not to all ITE. I think it is unlikely that a 100 W power supply can violate the Class A limits. If it isn't a switch-mode type (i.e. it has a mains transformer) it may even meet the Class D limits, or could be modified at low cost to do so. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. 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: 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.
