Hi First part of 2.4.2 talks about frequency (over OR under 1 kHz) next part talks about voltage (over OR under 450 Vac) so it must be an AND between those two requirements (current limit AND Capacitance). This is how CSA told me about the requirements 8 yeasr ago.
Best regards, Kim Boll Jensen Bolls Radgivning Ved Gadekaret 11F DK-3660 Stenlose Tlf.: 48 18 35 66 Fax: 48 18 35 30 Mobil: 22 99 69 91 E-mail: k...@bolls.dk web: www.bolls.dk Fra: emc-p...@ieee.org [mailto:emc-p...@ieee.org]Pa vegne af Clif Brick Sendt: 1. november 2006 17:41 Til: emc-p...@ieee.org Emne: [Norton AntiSpam] RE: 60950 question John, In this case, I'm not sure that 'and' makes sense. If it were 'and', then one would need to be certain, in spite of having a result lower than .7mA, that the circuit capacitance met the additional requirements. That isn't standard practice as far as I'm aware. There is a great difference between a sinusoidal, continuous current that exceeds let go and a current that MUST end due to lack of capacity or stored energy. In the sense of IEC 479-2, I think it's pretty clear that OR would make sense here, as there wouldn't be enough energy to cause burns, not a long enough current to exceed let go, and not a waveform likely to cause fibrillation. I don't know, I'm just trying to learn. Thanks, Clif From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of John Woodgate Sent: Wednesday, November 01, 2006 10:43 AM To: emc-p...@ieee.org Subject: Re: 60950 question In message <4be0b2b96f73e3448c6f86309fc15ca605ac5...@iticpm01.innotek-inc.com>, dated Wed, 1 Nov 2006, Clif Brick <clif.br...@invisibletech.com> writes >My question is one of understanding whether or not I must AND or OR the >seperate clauses in 2.4.2. This is a problem that keeps coming up in many standards. Editing committees should take careful note of it. It is worse with bulleted lists, which can be totally ambiguous with respect to 'AND' or 'OR'. But in the plain text of 2.4.2, one has to assume that the requirements are 'AND'. What does the Annex D measurement give as a result? If you don't have the instrument, you can do a SPICE simulation. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Swine wave - a waveform whose spectrum is exceptionally difficult to calculate. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - 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 contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. The sender therefore does not accept liability for any errors or omissions in the contents of this message, which arise as a result of e-mail transmission. - 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 ______________________________________________________________________
