In message <[email protected]>, dated Mon, 5 Feb 2007, David Cuthbert <[email protected]> writes >It sounds like you have a trace width calculator. For those who do not, >here is a link to an online trace width calculator.
It's not likely to be valid for impulsive currents, where the conductor rises in temperature very rapidly and the heat doesn't get time to flow away. On the other hand, you don't need a track that will carry the fault current continuously, only for as long as it takes the protective device to operate in the worst case, which may occur at less than the maximum prospective fault current. You need to look at the device's Isquared-t characteristics. -- 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 ______________________________________________________________________
