I support both John's opinions. I don't want PC traces for PE circuits outlawed in the standards because there may be some valid reason to do that, but I have never come across it in ITE or domestic appliances.
Based on my experience all mains circuits are provided with double or reinforced insulation. I believe the cost hit for that construction can be essentially nothing. Consequently nothing is connected to the so-called PE trace (or more correctly, a PC trace connected to the product's earthing means) except the approved Y caps, and possibly one or more SELV circuits. When inexperienced test engineers mentioned high current withstand of PC traces, I point out that the mains circuits cannot fault to earthed circuits as a result of a single fault. Therefore, the test is not required. Lou Aiken, LaMer LLC 27109 Palmetto Drive Orange Beach, AL 36561 USA tel ++ 1 251 981 6786 fax ++ 1 251 981 3054 Cell ++ 1 251 979 4648 From: John Woodgate <j...@jmwa.demon.co.uk> To: <emc-p...@majordomo.ieee.org> Sent: Saturday, February 01, 2003 3:12 PM Subject: Re: EN60950 protective conductor test > > I read in !emc-pstc that Rich Nute <ri...@sdd.hp.com> wrote (in > <200302012030.maa04...@epgc264.sdd.hp.com>) about 'EN60950 protective > conductor test' on Sat, 1 Feb 2003: > >> short-circuit conditions. The printed-board mounting versions of the IEC > >> 60320 appliance connector encourage the use of board traces to carry the > >> PEC; something that I would not be happy about, in principle. > > > >Such construction cannot be sloughed off in such > >an off-hand manner. This is solo BOGSAT > >engineering, which cannot be condoned. > > Is it not permitted to express a personal preference on this group? I > *prefer, personally*, not to use printed board traces as parts of the > PEC. I'm not suggesting that should be in IEC 60950 or any other > standard. > -- > 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: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: emc-p...@hypercom.com > Dave Heald: davehe...@attbi.com > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > Archive is being moved, we will announce when it is back on-line. > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc > 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
