An insulating lining or barrier of vulcanized fiber or similar materials used where spacing does not ( Z1 e4 d9 Z m
otherwise comply with the requirement shall not be less than 1/32 inch (0.8 mm) thick, and shall be so
3 F3 X$ G$ ]/ h1 ^. n0 w/ flocated that it is not adversely affected by arcing, except that vulcanized fiber not less than 1/64 inch (0.4 % o ]: v" o7 m o+ g
mm) thick is able to be used in addition to an air spacing of not less than 50 percent of the spacing 8 w; x& V' I, {% @: `0 D" x4 i
required for air alone. 1 Q$ C/ x' L+ G. t0 u7 N% W+ b
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 % }8 C5 V- d% o ?
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
' u, D8 B* u O' [/ q/ i" Z4 d* X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%。
% d! Q3 A& `# U: n7 p7 k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。
1 {1 k' X& T2 E& S# P6 i3 Z2 S7 E& ?+ G5 t x( c; N5 @
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? " ]# P: t* r* F; G9 g) K
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