Bill -
My reading of IEC60664-3 is that Type A is a surface coating, like a conformal coating, and Type B is encapsulation or potting. Different layers of a board would also fit into Type B. Regards, Peter L. Tarver, PE [email protected] > From: Bill Flanigan > Sent: Monday, November 17, 2003 5:10 AM > > Friends, > > My reading of EN61010-1:2001 leaves a few questions. > > What's a mains-derived circuit compared with a > mains circuit? If your > product employs the single-phase mains to power a > commercial 24V dc supply, > is that mains-connected or mains-derived? > > What is meant by (EN60664-3) a type A circuit > coating? Is this conformal > coating, applied over the typical masks/coatings > of the PCB? > > To what degree can the PCB mask be relied on for > insulation? I thought I > read once that it is not considered part of the > insulation system, but I > can't find it in '1010-1. > > Is there a approved substance that can be applied > to the PCB surface to > enhance basic insulation? e.g., trace A (say, > 24Vdc rail; accessible) is too > close to trace B (say, 220Vac). A single fault > could elevate this accessible > line. Is the application of a surface insualtion > allowable? > > WmFlanigan > This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
