I read in !emc-pstc that cnew...@xycom.com wrote (in <85256CC2.005F2DA4.
0...@notes.fw.xycom.com>) 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!


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