I read in !emc-pstc that Gregg Kervill <[email protected]> wrote (in <000401c1bc76$fb459a10$7e00a8c0@MENHADEN>) about '60950 SFC - Rathole warning', on Sat, 23 Feb 2002: >Please do not take emphasis AWAY from the point that I was trying to make: > >>We are required (by the standards, general morality, legal liability, etc) >to ensure that products will remain 'safe' under >worst case conditions. > >>Hence we spend much soul-searching to evaluate and to test under >'worst-case' conditions.
I considered that your point needed *clarification*. I was certainly not de-emphasizing such an apparently provocative statement. > >The example was merely to show one area where designers get it wrong - and >there are too many to list - hence I emphasis the principle of >responsibility - and worst-case... Designers get it wrong? The use of low-current fuses (although not 1 A or 2A in the BS1363 plug; they go in BS546 plugs and clock connectors) is permitted by BS1363 and BS7671. > > >In answer to your specific question: typically a manufacturer (wrongly) >selects a plug with a 13A marking and fits a 1,2,3,5,7Amp fuse. When the >fuse blows the user then replaces it with a 13A fuse. As per the generic >"13A" marking on the plug. > >I have seen this done by many engineers in many companies - but it is only >ONE of the common errors. > > You might have a claim that this is 'foreseeable misuse', which is a much wider subject that the electrical safety committees now have to take into account, for Europe anyway. In some cases, this will lead to new restrictions on design. -- 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"
