In message <[email protected]>, dated Sat, 5 Jun 2010, John Woodgate <[email protected]> writes:
> >>Bad things would probably happen if I have to use a VDR rated at 420V. > >Equally, bad things would probably happen if you use a VDR rated at >less than 420V. Spikes well above 288 V are not that rare on 240 V >mains. Ahem! Are those VDR voltages specified in the standard 'r.m.s. sine wave' or 'peak'? If peak, which would be logical, the calculation would be: 240 x sqrt(2) x 1.2 = 407 V. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK I should be disillusioned, but it's not worth the effort. - 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]>
