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这个不需要认证的,直接可以作为绝缘材料,在标准中叫vulcanized fiber。
+ h2 w5 W) r# S% M$ RUL153:' E/ [# i, X+ o- C# z/ R; d
25 Insulating Materials
3 C: b1 q7 c) m/ l7 _4 w% @& n0 L25.2 An insulating lining or barrier of vulcanized fiber or similar materials used where spacing does not
* \* J6 V- X' t% q0 c3 Potherwise comply with the requirement shall not be less than 1/32 inch (0.8 mm) thick, and shall be so, v7 W$ B h1 n( w0 X/ x1 P
located that it is not adversely affected by arcing, except that vulcanized fiber not less than 1/64 inch (0.4 mm) thick is able to be used in addition to an air spacing of not less than 50 percent of the spacing required for air alone. |
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