An insulating lining or barrier of vulcanized fiber or similar materials used where spacing does not
& a( m$ ~" o- D9 P# ~otherwise comply with the requirement shall not be less than 1/32 inch (0.8 mm) thick, and shall be so 6 b' r2 G, L- a# g8 j
located that it is not adversely affected by arcing, except that vulcanized fiber not less than 1/64 inch (0.4 & m' }- t9 n3 W& y+ v
mm) thick is able to be used in addition to an air spacing of not less than 50 percent of the spacing
( t4 {3 Q# F" z) G8 {required for air alone. 9 h7 {" V8 k3 y: j4 q4 `9 Q3 A+ O
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
. \9 O$ r7 B. f, ]0 X( i) c. [. 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 [% ^' |9 A
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%。
' r0 j4 E P' { z# `0 d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。
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1 `9 E/ }# h4 h: t3 ^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?
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