Hi all, Has anyone found a good way to explain to non-compliance types the difference between voltage rating and voltage specification? After all these years I still run into this discussion and have not found a good way to clear the air.
A classic example is an open frame AC/DC power supply used to produce the housekeeping voltages within a larger product. In a recent example, the PSU datasheet stated the voltage input range as 85 to 264 VAC. This is great and I really like that specification. However, I also had a design engineer who took those numbers from the datasheet and transcribed them directly to the rating label of his product. As a result the agency engineer wanted to apply the ±10% rule to the rating label voltage and the rating tests were then 76.5 to 290.4 VAC (this was not an ITE product). Note: a little quick math shows that the 264 VAC upper limit of the PSU is actually a result of 240 V plus 10%. All this seems obvious to me but apparently not to everyone ... and maybe it's me who is just a few sandwiches short of a picnic. I would be grateful to hear any experiences where explanations were successful and lasting. -- Douglas E Powell doug...@gmail.com http://www.linkedin.com/in/dougp01 - ---------------------------------------------------------------- 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>
