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本帖最后由 329485466 于 2012-3-16 17:40 编辑 ) I" W' G' w3 J8 M2 i" j& [+ [
包子 发表于 2012-3-12 17:02 
8 [3 _; G X, m5 @5 E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- r' S, V; f! `$ h/ S, X
1.5.9.4 Bridging of basic insulation by a VDR
F% S8 J4 Z0 j) \; |% S- fAfter the existing note of this subclause, add the following new paragraph:
4 i. N" i9 x7 u% v% P* uIt is permitted to use a gas discharge tube (GDT) in series with a VDR that bridges BASIC; c4 k! Z9 @1 X! S r; D* Q
INSULATION in accordance with the conditions in this subclause if the GDT complies with the
: R$ Z, Z+ w+ H1 \! Hrequirements for FUNCTIONAL INSULATION. 60950-1 Amend. 1 |
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