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本帖最后由 329485466 于 2012-3-16 17:40 编辑
( B/ Y' U2 `+ P" {% B9 |6 Y4 L包子 发表于 2012-3-12 17:02 
* s1 j, E& [. R3 K6 \* N c第二和第三种方法是符合现有标准要求的,第一种和第四种需要增加额外的过流保护装置,或者你的主电路中有过 ...
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根据1.5.9.2UL 60950-1 2nd edition: 2007,第一个是不符合要求的,第二个觉的不合理,暂时还没想好理由(会不会一个直剂雷过来,温度保险还没动作,VDR烧起来了,呵呵),第四个是可以的
& w# P `7 g+ M6 d) Q1.5.9.4 Bridging of basic insulation by a VDR; u, F+ Q9 y: l. Z
After the existing note of this subclause, add the following new paragraph:
2 l t" O% p) h! M$ C( }; [5 Z. bIt is permitted to use a gas discharge tube (GDT) in series with a VDR that bridges BASIC
6 {* s- c3 w! s" W" {) U& WINSULATION in accordance with the conditions in this subclause if the GDT complies with the E, d. M2 l8 [6 X$ S; D* |
requirements for FUNCTIONAL INSULATION. 60950-1 Amend. 1 |
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