I almost agree John :^]
------Original Message----- -From: owner-emc-p...@majordomo.ieee.org -[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of John Woodgate -Sent: Tuesday, January 22, 2002 2:37 AM -To: emc-p...@majordomo.ieee.org -Subject: Re: EN 61000-3-3 compliant heater controller - - - -I read in !emc-pstc that Pettit, Ghery <ghery.pet...@intel.com> wrote -(in <D9223EB959A5D511A98F00508B68C20C0226B8A3@ORSMSX108>) about 'EN -61000-3-3 compliant heater controller', on Mon, 21 Jan 2002: - ->So rather than educating the public on the cause of flicker, -we get saddled ->with a useless design requirement. - -'Educating the public' is a project which always causes disaster. It -simply isn't industry's job to do that. I think that industry has gone a long way - I remember twisting bare wires from two or more power cords together and holding them in the mains socket with match sticks. But that was in the UK in the 'good-old days' of 3A, 5A and 15A (2 and 3 pin) sockets and multiway outlets did not exist. True there are still disasters (the poodle in the microwave) but the fat that public education lags industry practices does not mean we must not try. In fact - public education is supported implicitly by the industry (and standards) requirements to supply operator warnings and instructions. Agree - I have a 'soggy' mains supply and each time one of our LASER printers kicks 'IN' the UPS's on that supply let out a squawk. PLEASE do not let ANYONE try to tell me that intermittent non-compliances are OK - THEY are totally unacceptable!!!!! PARTICULARLY DURING CONFERENCE CALLS. SET FLAME <OFF> : ^ ) - -Besides, it isn't a 'useless' requirement. The reason I gave is the -reason that repetitive voltage changes are called 'flicker'. But they -are undesirable in themselves: they can disturb the operation of -equipment. - -> Typical bureaucracy - don't fix the ->problem, make it LOOK like you're doing something, at someone else's ->expense. Just like the harmonics standard - fix a problem -that doesn't ->exist. - I believe that there are some countries (I think that Bill Lyons can support this) that place a surcharge on third harmonic offenders. -Harmonics DO cause problems. Even in USA, where, because of the design -of the distribution system, harmonics are less threatening -than in other -countries, there are still problems with hot neutrals due to summation -of triplen harmonics. --- -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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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.
