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本帖最后由 Liu 于 2011-12-31 01:00 编辑 * u) R' `1 R/ r7 `, g) {9 l- W
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很不同意楼上两位的想当然,根据UL1598,这个绝缘的要求应该通过以下条款来判断:% u; F' }" K q
5.14 Conductor protection
) `6 p4 E" ^, \; [5 v E5.14.1 Conductors that pass over edges or through openings in metal shall be secured from contacting
# l! G# t( D3 Q, E* ~the edges or be protected from cutting and abrasion. For sheet metal less than 1.1 mm (0.042 in) thick,
; D7 w- E/ K7 I- kprotection shall be provided by one of the following methods:
* j0 [' F, L* m7 Q- S(a) rolling the edge of the metal not less than 120 degrees;% c6 t7 ~ w$ n1 p0 V' y/ `: H: B
(b) a bushing or grommet of a material other than rubber at least 1.2 mm (0.047 in) thick; or
7 m: p% `' _1 R- x( M; I(c) glass sleeving at least 0.25 mm (0.010 in) thick., C0 e. k7 g H- ]
8 l8 |1 X# d8 Z" H% z- p: y这里只有厚度要求,与其他无关。但是,根据ANNEX A 的Table A.1的要求:3 j) R( B$ s* [7 k
Tubing, extruded insulated是要满足 Standard for Extruded Insulating Tubing UL 224 及C22.2 No. 198.1 Extruded Insulating Tubing* L# }% Y& `* O6 n
Tubing, flexible nonmetallic是要满足Standard for Tests for Surface Burning Characteristics of Building Materials UL 723 及 C22.2 No. 56 Flexible Nonmetallic Tubing
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所以根据楼主的描述,如果(a) rolling the edge of the metal not less than 120 degrees,那是什么都不需要了1 E) E6 c! x+ \5 t
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如果没有翻边达到要求,热缩套管如果有0.25mm其实也未尝不可,就是看满足以上所列标准与否。 |
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