Alan- Don't forget that immediately above every PWB trace there is an air gap to be considered... voltages can flashover through the air above traces...
Dwight Alan Booth wrote: > > 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. > > Equipment Engineering Group > Fujitsu Telecommunications Europe Limited > Solihull Parkway > Birmingham Business Park > Birmingham > B37 7YU > Telephone +44 121 717 6492 > FAX +44 121 717 6014/6018 > e.mail- [email protected] -- DWIGHT HUNNICUTT Sr. Compliance Engineer **************************** * <[email protected]> * * (510) 413-1349 direct * * (510) 492-0808 fax * * VINA Technologies,Inc. * * 42709 Lawrence Place * * Fremont, CA 94538 * ****************************
