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本帖最后由 329485466 于 2012-3-16 17:40 编辑 1 ?- a! |9 e5 m$ l, n2 B9 c% K# Y
包子 发表于 2012-3-12 17:02 ; [, a) d0 |0 M8 D. T. Q& \
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 ... ' y7 X6 `% m4 }
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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
- r3 r; v( C: ^6 o' X1.5.9.4 Bridging of basic insulation by a VDR
+ v- D) b6 T5 c9 g& `# V1 W8 S4 D- FAfter the existing note of this subclause, add the following new paragraph:& [, F9 k" i3 c7 Z
It is permitted to use a gas discharge tube (GDT) in series with a VDR that bridges BASIC
# W. I2 s9 k1 H4 z+ ?( MINSULATION in accordance with the conditions in this subclause if the GDT complies with the
- I+ H( R, {+ b& z' ?requirements for FUNCTIONAL INSULATION. 60950-1 Amend. 1 |
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