An insulating lining or barrier of vulcanized fiber or similar materials used where spacing does not
% d# n$ C, h% \3 O( F, a: Hotherwise comply with the requirement shall not be less than 1/32 inch (0.8 mm) thick, and shall be so
8 w- t0 b, w1 y: K( g' Nlocated that it is not adversely affected by arcing, except that vulcanized fiber not less than 1/64 inch (0.4
t Y8 }/ }: T; {9 amm) thick is able to be used in addition to an air spacing of not less than 50 percent of the spacing
: Q; }* k- y1 w8 I z4 h9 I" ?required for air alone.
2 q0 q, g9 X( |& N( f. n4 v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 " N+ y) H, q0 I* L/ {' m4 q
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
J5 a2 `. _, v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%。
+ ]$ F/ g' [$ [) ^0 y# U9 e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。
6 D+ a$ b* V/ V, T% [4 i* m- p( e7 P# a( ]5 F v3 B/ |8 F
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? ' O5 W# C* h6 k% p) J' K, B
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