Pat, I am having trouble convincing an agency that the other side of the rectifier is not "between line conductors". Are you or is anyone else on the list aware of any actual documents that state this more explicitly, provided everyone else agrees with this analysis.
Jody From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of pat.law...@slpower.com Sent: Friday, March 16, 2007 4:29 PM To: emc-p...@ieee.org Subject: Re: Electrolytic Capacitors in Primary Circuits Hi Jody: UL 60950-1 1st Ed., clause 1.5.6 ('Capacitors in primary circuits') says: 'A capacitor connected between two line conductors of the PRIMARY CIRCUIT, or between one line conductor and the neutral conductor, shall comply with IEC 60384-14:1993, subclass X1 or X2.' The electrolytic capacitor you mentioned is connected between the rectifier '+' and '-', not between line conductors. I always though it interesting that a 0.1uF film cap connected across the line conductors going into a rectifier had to be safety-rated. But if you move it to the output side of the rectifier, there's no safety rating required. Pat Lawler SL Power Electronics Corp. emc-p...@ieee.org wrote on 03/16/2007 11:38:25 AM: > The electrolytic capacitor that sits between the rectifier and > transformer in SMPS is typically not an agency approved component. > Where is this exemption documented in 60950-1, Clause 1.5.6? > Best Regards, > Jody Leber > Senior Regulatory Engineer > jody.le...@motorola.com > http://www.motorola.com/producttesting > Motorola Product Testing Services > 1700 Belle Meade Court > Lawrenceville, GA 30043 > 770.338.3581 P > 404.387.1224 C > 847.761.3145 F > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society > emc-pstc discussion list. Website: http://www.ieee-pses.org/ > To post a message to the list, send your e-mail to emc-p...@ieee.org > Instructions: http://listserv.ieee.org/request/user-guide.html > List rules: http://www.ieee-pses.org/listrules.html > For help, send mail to the list administrators: > Scott Douglas emcp...@ptcnh.net > Mike Cantwell mcantw...@ieee.org > > For policy questions, send mail to: > Jim Bacher: j.bac...@ieee.org > David Heald: emc-p...@daveheald.com > > 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. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com 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. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
