Alan - I'm not certain about the origin of the application of Tables 3, 4 and 5 in your example, but since Tables 3, 4 and 5 generally have lesser distances for the same voltages than are found in Table 6, this seems primarily an academic exercise for which I'd need a specific safety concern to pursue.
Regards, Peter L. Tarver Nortel ptar...@nt.com > ---------- > From: Alan Booth[SMTP:a.bo...@ftel.co.uk] > Sent: Friday, May 08, 1998 1:27 AM > > Dear Treggers, > > I am having a problem with clause 2.9.5 of EN60950 regarding Coated > Printed Boards. > > The second paragraph, second sentence reads : > > 'Between any two uncoated conductive parts and over the outside of the > coating, the minimum distances in tables 3, 4 or 5 apply.' > > Tables 3, 4 and 5 only deal with clearance distances. I would have > thought that table 6 for creepage was a more appropriate application in > this instance. > > Can anyone explain the reasoning behind this? > > Many thanks, > > > Alan Booth. >
