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各位XDJM,谁做过UL的测试?
& g# i% m) R4 F- F F1 @+ H/ }& J有些关于UL867的问题请教各位:" `1 i; d' w6 n* t: C
44.2 Shorted trace test" ?2 D2 r8 D1 ~
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.
) s% H6 L' \' z5 @As a result of the testing:3 ~( I" x9 L( a. _- v
a) The overcurrent protection associated with the branch circuit to the unit shall not open,
+ O3 d1 y, g4 ib) The ground circuit fuse shall not open,8 k3 N& q$ i7 k; P3 r; x$ o" h
c) A wire or a printed-wiring board trace shall not open, and* V( Y! B C& N7 u; n: e
d) The device shall emit no flame or molten metal.
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( X+ y; j+ x3 D7 A5 P其实a)这条我很难理解:( V* l* ?1 I/ C+ ?
分支电路的过电流保护装置不能开路,
6 |9 J" m; q- T2 a0 k- N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。
1 {% ]0 p: W! D) s* b; l; L各位觉得我这么理解对么?- I, P5 z) R7 p; i
如果不对,欢迎指正。
. U7 T- l$ z7 M8 V# ^谢谢。 |
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