An insulating lining or barrier of vulcanized fiber or similar materials used where spacing does not
, Z' W$ t0 [4 H% s( ]" j# Sotherwise comply with the requirement shall not be less than 1/32 inch (0.8 mm) thick, and shall be so 0 g3 Y {6 e+ H% @) u4 o' I' V
located that it is not adversely affected by arcing, except that vulcanized fiber not less than 1/64 inch (0.4 ) f/ W" T) ~0 E; N
mm) thick is able to be used in addition to an air spacing of not less than 50 percent of the spacing : M& _2 w+ l! G5 K7 J
required for air alone.
) q+ |" }2 |1 ^& D4 W) G7 M# e' 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
$ g( E; T# y5 [4 J" a2 s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
" i. @! e- _+ D+ G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%。
2 R5 [3 W2 A1 z$ k& P2 `" u1 _9 V5 V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。
8 ?7 i1 {2 s% u( A
: {& Y1 W% X/ D( A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?
& {- ^) |4 m t( t4 j |