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本帖最后由 Liu 于 2011-12-31 01:00 编辑
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; {$ U/ E' B6 _" h8 N% X' w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:0 z7 D; a$ v9 f% w
5.14 Conductor protection
7 [) z1 l; s- U9 J& _* e5.14.1 Conductors that pass over edges or through openings in metal shall be secured from contacting
+ z p5 R2 k1 `7 f9 Dthe edges or be protected from cutting and abrasion. For sheet metal less than 1.1 mm (0.042 in) thick," q1 i: I9 Q5 \3 r( p: O; D2 i/ ]
protection shall be provided by one of the following methods:' v( @. i) G5 G% X1 v) H
(a) rolling the edge of the metal not less than 120 degrees;
% Y7 w. `9 a( l, E(b) a bushing or grommet of a material other than rubber at least 1.2 mm (0.047 in) thick; or
1 d1 U# ]9 B, C) i(c) glass sleeving at least 0.25 mm (0.010 in) thick.3 q% o: ^- u" i, Q
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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:, t) b6 c7 ]$ `( c) K5 h$ g
Tubing, extruded insulated是要满足 Standard for Extruded Insulating Tubing UL 224 及C22.2 No. 198.1 Extruded Insulating Tubing
1 h' Z% z! l7 C8 @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
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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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