An insulating lining or barrier of vulcanized fiber or similar materials used where spacing does not
3 D- o h& X! k2 xotherwise comply with the requirement shall not be less than 1/32 inch (0.8 mm) thick, and shall be so * a3 a# M, k' \) w" _. l. z- V" w
located that it is not adversely affected by arcing, except that vulcanized fiber not less than 1/64 inch (0.4
. e$ K& l) W1 B. Y: ymm) thick is able to be used in addition to an air spacing of not less than 50 percent of the spacing
+ R6 O; f) o+ H+ W; H" J; vrequired for air alone. $ A+ K8 P- g8 g2 G
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
. ]; x% l) y; B) \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 ' A! n5 m/ j. t6 N" I
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%。
' e$ d# V7 |2 o% {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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) d4 r4 V/ D" q1 \' K# L# B9 I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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