I read in !emc-pstc that [email protected] wrote (in <85256CC2.005F2DA4. [email protected]>) about 'EN60950 protective conductor test (was Re: Circuit Breaker Tripping Dring Fault Tests)' on Mon, 3 Feb 2003:
>My UL guy tells me that I should expect the typical service type CB to be rated >up to + 10%. So it appears that I need to concern myself with a burst of >current >up to approximately 22 amps for the 20 amp AC circuit that my product is being >evaluated for. Until it trips, your CB lets through the **whole 200 A**. The trip current is practically irrelevant in this test; what matters is the trip TIME. The board trace may stand 200 A for 50 ms but not for 100 ms. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! 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
