> I can't understand how a 'rated voltage' can be 560 V > +30%/-15%. It must > mean something other than what is normally > understood as 'rated voltage' > in safety standards. In the IEC, rated voltage is a value assigned by the manufacturer.
For years, standards committees have attempted to specify one or more formats for the voltage rating. Each standard is different, and sometimes each edition is different. The problem is when a manufacturer uses a single, nominal value. We know that line voltages vary, so standards committees choose, say, +6%, -10%. We have commonly seen wide-ranging power supplies rated 90-250 volts. But, we cannot fault a manufacturer for rating his wide-ranging product as 150 volts, +166%, -60%. With your i-Phone, you can easily calculate whether the equipment will operate on your power line! In this case, the manufacturer has rated his product to operate from 470 to 728 volts. What is wrong? Best regards, Rich - ---------------------------------------------------------------- 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 <[email protected]> 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
