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17.3.3 An insulated lining or barrier of vulcanized fiber or similar material used where a spacing would
9 M( P! C9 b# ?' Votherwise be less than the minimum shall not be less than 1/32 inch (0.8 mm) thick and shall be so located: c/ b/ z" a x# N0 j
or of such material that it will not be adversely affected by arcing.
% F5 T; V, w6 _Exception No. 1: Vulcanized fiber not less than 1/64 inch (0.4 mm) thick may be used in conjunction with
9 L$ V& |! R; ?4 D# C7 n0 Q& V( xan air-spacing of not less than 50 percent of the minimum through-air spacing.
( ~, l. H9 N; ^! n. ?Exception No. 2: Insulating material thinner than that specified may be used if investigated and found to) Z5 ~- y* R& c/ [: p8 A) r
be acceptable for the application.* F# V, J* _8 Y3 a$ N, v5 N; H8 A. i
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UL778,17.3.3章节有提到绝缘材料厚度为0.8mm。是否相反极性间的绝缘材料厚度也按此要求,还是没有要求?
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# W" u, S; P1 j6 R$ a3 P1 @谢谢哦! |
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