An insulating lining or barrier of vulcanized fiber or similar materials used where spacing does not
! R8 B0 Q% t! e+ D. a jotherwise comply with the requirement shall not be less than 1/32 inch (0.8 mm) thick, and shall be so - o! e, X9 [! w7 \
located that it is not adversely affected by arcing, except that vulcanized fiber not less than 1/64 inch (0.4 6 t& j* u' S0 a/ H( R1 P2 D! K; y
mm) thick is able to be used in addition to an air spacing of not less than 50 percent of the spacing
/ l# Z/ Q; p& Q* }6 m5 Drequired for air alone. 8 A4 T- C' s% d# 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
. w) l0 \5 j: @- g4 a6 U& b9 c! _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
& R8 e4 a2 r& |& ?* X) ]3 H$ f6 K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%。
: Y$ I" ]6 L- C. z) ^ ~7 q2 o+ a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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3 [1 }$ P1 k1 F( Y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? ' A) i* N7 e" U, @9 p
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