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各位XDJM,谁做过UL的测试?
有些关于UL867的问题请教各位:
44.2 Shorted trace test
44.2.1 Printed-wiring board traces mentioned in 44.1.1 are to be tested as described in 44.2.2 – 44.2.4.
As a result of the testing:
a) The overcurrent protection associated with the branch circuit to the unit shall not open,
b) The ground circuit fuse shall not open,
c) A wire or a printed-wiring board trace shall not open, and
d) The device shall emit no flame or molten metal.
其实a)这条我很难理解:
分支电路的过电流保护装置不能开路,
这点是为什么呢?如果过流保护装置形成开路的话,那整个电路肯定就是安全的,不可能存在任何危险?标准要求不能形成开路,那要这个过流保护装置就没有任何意义了。
各位觉得我这么理解对么?
如果不对,欢迎指正。
谢谢。 |
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