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17.3.3 An insulated lining or barrier of vulcanized fiber or similar material used where a spacing would
/ v/ S' H7 F, Q! W wotherwise be less than the minimum shall not be less than 1/32 inch (0.8 mm) thick and shall be so located! ]2 d3 q8 z4 x T7 U9 y; _1 z7 m
or of such material that it will not be adversely affected by arcing.
; `. L+ \, H/ }7 {Exception No. 1: Vulcanized fiber not less than 1/64 inch (0.4 mm) thick may be used in conjunction with
- g/ W) W9 i/ {an air-spacing of not less than 50 percent of the minimum through-air spacing.; N8 u! E/ s, ]5 `- e7 x
Exception No. 2: Insulating material thinner than that specified may be used if investigated and found to( P$ \4 P( ~2 \, I t/ K
be acceptable for the application.
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9 M' n+ B+ e* qUL778,17.3.3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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谢谢哦! |
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