"Richards, Carl" <[email protected]> wrote (in <[email protected]>) about 'Mixing of Power phases - Legal position', on Thu, 29 Sep 2005:
>We have a customer who wishes to power our product via two 30A Single >Phase spurs, the customer has two Power Distribution Units (PDU's) each >with 3 phase supplies. The customer wishes to provide a single phase >from each PDU to ensure power balancing and outage protection, but it >seems cannot guarantee that we will get the same phase colour from each >PDU. > >Brushing to one side for a moment the technical issues, and the >possible frightening consequences; what does the IEE Regs have to say >about such a scenario ? > >I have a condensed version which make no mention as far as I can tell >about this kind of situation, clearly we will be demanding that our >cabinets are clearly marked and the cable presentation reflects the >final power installation to reduce the possibility of accidents during >servicing At one time, this sort of arrangement was frowned on by the IEE, but times seem to have changed. Provided you take all the precautions you need in order to ensure that a dangerous situation cannot occur, I think you are allowed to do it. IF IEC/EN 60950 applies to your product, there are labelling requirements where there is more than one incoming supply. -- Regards, John Woodgate, OOO - Own Opinions Only. Deadlines are 90% of deadliness. http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk - 2005 IEEE Symposium on Product Safety Engineering 3-4 October Schaumburg, IL http://www.ieee-pses.org/symposium 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
