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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。
# R" `5 `+ o5 f1 rUL153:
4 T, G5 O: S' M# C' s25 Insulating Materials
! }, t# r1 O! }+ R25.2 An insulating lining or barrier of vulcanized fiber or similar materials used where spacing does not
# M5 e& O% j% ]5 s' n1 ^* eotherwise comply with the requirement shall not be less than 1/32 inch (0.8 mm) thick, and shall be so3 M' z4 E7 \0 s* D* W/ W, Z
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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