Hi Brian,
Annex Q (normative) is referring to IEC 61051-2 and the requirement in b) The max. continuous voltage (2.1.2 of IEC 61051-2) is selected from the list of preferred voltages and shall be at least 120% of the RATED voltage or the upper voltage of the RATED voltage range. This list is 60 130 250 275 420 460 680 1000V rms. So if the RATED voltage is 240V, the minimum varistor type shall be 420V Some Safety labs understand this requirement, some don’t. Best regards, Kris Carpentier From: [email protected] [mailto:[email protected]] On Behalf Of Brian O'Connell Sent: zaterdag 5 juni 2010 0:09 To: [email protected] Subject: VDR recommendations Looking for VDRs that are rated for 288V continuous (see annex Q of 60950-1). Lots of stuff rated 275V and 300V, but cannot find anything in between. Why ?!?! - because I have done some surge tests using 300V components on a custom unit and was not satisfied with results - nothing terrible, just no warm feeling from a test completed with good margin. Currently use Epcos, Panasonic, and UCC. thanks, Brian - 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/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: Jim Bacher: <[email protected]> David Heald: <[email protected]> - 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/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: Jim Bacher <[email protected]> David Heald <[email protected]>
