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本帖最后由 Liu 于 2011-12-31 01:00 编辑
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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:
2 a4 ~$ S* ~% a0 \5.14 Conductor protection
8 z7 b/ K4 _4 ~5.14.1 Conductors that pass over edges or through openings in metal shall be secured from contacting
/ Y* E: x" l9 \/ t! ]' rthe edges or be protected from cutting and abrasion. For sheet metal less than 1.1 mm (0.042 in) thick,% ]; A7 m; Q% j$ l
protection shall be provided by one of the following methods:
( y4 n% }, _8 c: M(a) rolling the edge of the metal not less than 120 degrees;: ^: c9 a& Z! q6 Y/ H+ n- w2 A
(b) a bushing or grommet of a material other than rubber at least 1.2 mm (0.047 in) thick; or
/ }( D6 @ l6 G8 @& i(c) glass sleeving at least 0.25 mm (0.010 in) thick.
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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:8 j6 P/ Y, y9 P- B5 [
Tubing, extruded insulated是要满足 Standard for Extruded Insulating Tubing UL 224 及C22.2 No. 198.1 Extruded Insulating Tubing) _2 D1 k+ _! b9 j8 ^! k" F0 U6 }
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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0 w3 d# z: L: R' L- f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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* T2 O/ D f0 C1 x& t9 B% x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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