This message has been converted via the evaluation version of Transend Migrator. Use beyond the trial period specified in your Software Evaluation Agreement is prohibited. Please contact Transend Corporation at (650) 324-5370 or [email protected] to obtain a license suitable for use in a production environment. Thank you. <br> ---------------------------------------------------------------------<br> In article <[email protected] emc.co.uk>, Julian Jones <[email protected]> writes
>We have a customer who has had their declaration of conformity >questioned by the purchaser. The equipment is a 42U 19 inch rack, with >approx 40 ITE products within it. the rack is fed from a single phase >63A socket. The total load is approx 45A. the whole rack has been tested >by a USA safety lab to EN60950 3rd edition. the (UK ) end customer is >now questioning whether the DoC should reference BS7671 (UK's Wiring >Regulations) No. See below. As is not uncommon, the customer doesn't know its posterior from its caudal flexure. >with the result of the 63A feed being hardwired, secondary >earthing being implemented to meet the earth-leakage requirement and the >power distribution being redesigned to prevent "daisy-chaining" >pluggable earth connections. Over the years we have EMC tested many >racks but never seen one which did not have pluggable mains connectors. >Each 'component' within the rack draws a max of 2A most at 0.5A We do >not have safety expertise within the company, so I asking this question >of the forum. > >"Is EN60950 the right standard for power distribution inside a rack?"" Yes. BS7671 is a national standard; it's not harmonised under the LVD and it only has extremely limited application to load equipment. However that 'limited application' means that you should check that the internal wiring does not *conflict* with anything in BS 7671 and that the earthing is *consistent* with Section 607 of BS 7671. -- Regards, John Woodgate, OOO - Own Opinions Only. The good news is that nothing is compulsory. The bad news is that everything is prohibited. http://www.jmwa.demon.co.uk Also see http://www.isce.org.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/listserv/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: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
