I assume that there is no minimum time interval for the protection of power quality on the public mains, since some devices may be susceptible even to short durations of increased voltage distortion.
Ralph McDiarmid, AScT Compliance Engineering Group Xantrex Technology Inc From: [email protected] [mailto:[email protected]] On Behalf Of Brian O'Connell Sent: Tuesday, April 24, 2007 11:30 AM To: [email protected] Subject: RE: 61000-3-2 According to my wonderful copy of this wonderful standard (wonderfully purchased from BSI), the first dashed item indicates "Equipment with a rated power of 75 W or less, other than..." And according to the good people at the EMC lab (an NB), the peak power IS the rated power, no matter how small the duty cycle. So, are they trying to get more business, or can I just use the average power rating and not have to do this wonderful test ? Just wonderful. R/S, Brian > -----Original Message----- > From: [email protected] [mailto:[email protected]]On Behalf Of John > Woodgate > Sent: Tuesday, April 24, 2007 10:41 AM > To: [email protected] > Subject: Re: 61000-3-2 > > > In message <[email protected]>, > dated Tue, > 24 Apr 2007, Brian O'Connell <[email protected]> writes: > > >As usual the replies have been very helpful. Now the boss says "no > >stinkin PFC" for this power supply. > > > >So, can the 75W rating be applied to an averaged input > power, or does > >it apply to the peak (surge) power ? > > > >If I am allowed to use the 'average' input rating, what time > interval > >is required to indicate this average power rating > > I suppose you don't actually have a copy of the standard. If so, I > suggest you buy one, rather than expect other people to save > you £X by > each spending time (= money) answering your questions piecemeal. > > If you HAVE a copy, what about the first dashed item in > clause 7 isn't > clear? > > Why don't you just measure the thing? If the 200 W is a > linear load, it > will almost certainly pass anyway. Being a printer, Class A limits > apply. It would probably be difficult to design a 200 W product that > didn't meet those limits, let alone a 75 W product. > -- > OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk > There are benefits from being irrational - just ask the > square root of 2. > 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 [email protected] 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 [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] 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 [email protected] 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 [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] 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 ______________________________________________________________________
