An insulating lining or barrier of vulcanized fiber or similar materials used where spacing does not
% y! H$ p3 r: X- f7 K7 G' Botherwise comply with the requirement shall not be less than 1/32 inch (0.8 mm) thick, and shall be so
( G5 ?5 w) z* w( d1 D! t/ _located that it is not adversely affected by arcing, except that vulcanized fiber not less than 1/64 inch (0.4
6 Y/ @) X5 h* b8 U; r, g5 ?% w8 Emm) thick is able to be used in addition to an air spacing of not less than 50 percent of the spacing
$ X$ e3 a7 D4 X! Wrequired for air alone.
( ^$ z: N& M; x6 L" ]如果硬化纸板绝缘衬里、绝缘层或是相似的材料用于间距否则不会符合要求的情况下,这些材料不 & {" C: K+ i* l f' [
能小于1/32 英寸(0.8 毫米)厚,其位置也不能受发弧的不利影响,除非厚度不小于1/64 英寸(0.4 毫
- E" ^6 X) c! I米)的硬化纸板可以另外应用于空中间距不小于只要求于空中的间距的50%。
. t7 V* j" h# h. h4 _例外:如果硬化纸板绝缘衬里、绝缘层或是相似的材料符合17.3 的规定,则不要求其符合这一要求。
3 i, F+ o5 R9 g% z! S
- A3 p" x& c: ~/ H1 D; H/ d) W上面英文有点八股,很难理解?谁能告个例子讲下?如电路板与外壳之间隔了个硬纸皮样东西,厚度要按上面来吗? - ~1 k) j' w+ G" v* V. _
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