In message <4be0b2b96f73e3448c6f86309fc15ca605ac5...@iticpm01.innotek-inc.com>, dated Wed, 1 Nov 2006, Clif Brick <[email protected]> writes
>In this case, I'm not sure that 'and' makes sense. It may not, but see below. We have to assume that 'AND' is meant. > If it were 'and', then one would need to be certain, in spite of >having a result lower than .7mA, that the circuit capacitance met the >additional requirements. That isn't standard practice as far as I'm >aware. Maybe not standard practice, but if you think about it, the whole standard wouldn't make sense if each sentence or paragraph was 'OR' the previous one. > >There is a great difference between a sinusoidal, continuous current >that exceeds let go and a current that MUST end due to lack of capacity >or stored energy. Indeed. But in the case under discussion, I think the voltage is maintained, not due to a charge. > >In the sense of IEC 479-2, I think it's pretty clear that OR would make >sense here, as there wouldn't be enough energy to cause burns, not a >long enough current to exceed let go, and not a waveform likely to >cause fibrillation. Yes, agreed, but we have to look at what the standard says; if we think what it says is wrong, we have to flag that up to the responsible committee. > >I don't know, I'm just trying to learn. A lifetime occupation, especially in standards work. One lesson is that standards often don't say what they mean, and people may have been discerning (maybe unconsciously), and using, the 'meaning' for years before someone notices that the 'saying' is different. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Swine wave - a waveform whose spectrum is exceptionally difficult to calculate. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - 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/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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
