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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。
. e( \ x1 t* J6 b, R# i9 VUL153:' `. V7 C! f3 ~+ N5 a1 x; F
25 Insulating Materials
, K4 d' M6 [- M! q# V: x/ X5 R- _25.2 An insulating lining or barrier of vulcanized fiber or similar materials used where spacing does not% X, |% j1 R! P! }( S8 ]+ k" r
otherwise comply with the requirement shall not be less than 1/32 inch (0.8 mm) thick, and shall be so/ q$ i% L- i: n. A& v$ H
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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