No need to say much, except that I fully agree with both Rich and John W! John Allen W.London, UK
-----Original Message----- From: John Woodgate [mailto:j...@jmwa.demon.co.uk] Sent: 22 February 2015 08:04 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] standards-driven product safety In message <54e90ce3.9030...@bendbroadband.com>, dated Sat, 21 Feb 2015, Richard Nute <ri...@bendbroadband.com> writes: >> No-one will try to write a standard for a product that does not yet >> exist, so standards development must always lag innovation. > >The question I ask is: Can you make a safe product without a safety >standard? Yes. 'Safe' products (perhaps not by the current criteria) preceded, for example, BS 415 (an ancestor of IEC/EN 60065), which originally applied to 'battery eliminators' (mains power packs for battery radios, 120 V DC at about 60 mA). > >If the principles of product safety are known, they can be applied to >an innovative product technology as well as existing product >technology. >No safety standard is required. Agreed. The EU system allows that. > >The three-block model can tell when safeguards are required. For most >products, both a basic safeguard and a supplementary safeguard provide >sufficient safety. Such safeguards provide protection under normal >conditions and under single fault (e.g., failure of the basic >safeguard) >conditions. Agreed. > >Such is engineering and science driven safety, not standards driven >safety. Well, they are not opposites. Standards are necessary to support regulation intended to eliminate unsafe product from the market. Those standards should be 'engineering and science driven', not arbitrarily prescriptive. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk When I turn my back on the sun, it's to look for a rainbow John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
