I read in !emc-pstc that Spencer, David H <[email protected]> wrote (in <052106A55179D611B34300096BB02E3F8B99@USAMCMS4>) about 'EN61000-3-3 & -3-11 off topic a bit!' on Thu, 31 Oct 2002:
>I've just looked at all the draft copies of this standard(that I have), and >the older version TR IEC 1000-3-5. Still only says 75amps. Again no "per >phase". Here is the [paraphrased] response from the Convener of the WG concerned: Quote (sort of) It's not necessary to include 'per phase' if 'rated current' is specified, because 'rated current ' is always 'per phase'. If you add the currents in all three phases *correctly*, you get zero, so that is not a sensible operation. Endquote > >I would have to say if TC77A wanted it to say "<75A per phase", it would be >in there. Well, it's SC77A, but I agree that it would have been sensible to closely align the text of IEC 61000-3-11 with that of IEC 61000-3-3, even if it's not strictly necessary when 'rated' is included. The point will be borne in mind for the next amendment or edition. Incidentally, I don't see that this is 'off topic' at all. Problems of interpretation or application of standards are important, and someone has to actually DO something to bring them to the notice of the committees concerned. I, and other people here, are in a position to do that more easily than most people can. -- 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"
