An insulating lining or barrier of vulcanized fiber or similar materials used where spacing does not ; e3 \& x) l( d9 A3 v) L
otherwise comply with the requirement shall not be less than 1/32 inch (0.8 mm) thick, and shall be so
! _9 Q4 u E& W d. `located that it is not adversely affected by arcing, except that vulcanized fiber not less than 1/64 inch (0.4
" l, }# l2 T) t" F: ?7 E- S) dmm) thick is able to be used in addition to an air spacing of not less than 50 percent of the spacing 6 [2 C( R) U* V+ z
required for air alone.
m4 {+ b0 M* c& o0 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 $ N# D, U% }6 W/ T4 G& @
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 " [* E' E" K7 [$ X5 n3 L% l, H
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%。 ! ^4 j2 ^% F4 W" H
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。
! ~0 I' F- L1 E" B6 h; s2 ]) h' l! N3 M; a$ g, Q% t
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?
5 Y+ u: J, N" Q |