In message <[email protected]>, dated Wed, 7 Mar 2007, Jim Eichner <[email protected]> writes:
>1. Why not directly connect the shield to digital ground? Ground loop created? > >2. Why would a Y-cap be required? The cap would be joining two parts >of the same circuit, so it would not be across an isolation boundary. I >can't think of a reason to require either the 250V rating or the Y >rating. Not for safety but for reliability if the network is subject to high-voltage surges induced from power circuits or indirect lightning strike. Anything less durable than a Y-cap may fail. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk There are benefits from being irrational - just ask the square root of 2. 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 ______________________________________________________________________
