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本帖最后由 329485466 于 2012-3-16 17:40 编辑
, x! [6 A9 z: g) U/ q4 B) E4 Z" o8 L7 X包子 发表于 2012-3-12 17:02 4 G1 \+ g& ~( Y. R7 V. V4 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 ... ! E3 M" u% C( o8 v0 q
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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1 B5 P5 h" t5 t$ a6 q3 c4 R b+ W
1.5.9.4 Bridging of basic insulation by a VDR- O, g4 I: c4 o7 I8 @/ `
After the existing note of this subclause, add the following new paragraph:7 r' n2 r- [* n
It is permitted to use a gas discharge tube (GDT) in series with a VDR that bridges BASIC& H2 M# K9 o1 `* f7 x q, f
INSULATION in accordance with the conditions in this subclause if the GDT complies with the7 D* ~; t- o7 _ u: ?
requirements for FUNCTIONAL INSULATION. 60950-1 Amend. 1 |
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