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本帖最后由 Liu 于 2011-12-31 01:00 编辑
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4 l; Y3 d) k7 ?+ b$ f H8 E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 \6 y) w* x/ n8 C- n5 | _, O2 v
5.14 Conductor protection
4 B: e6 u8 j; V5.14.1 Conductors that pass over edges or through openings in metal shall be secured from contacting
/ n2 c& F7 _% q- @; ithe edges or be protected from cutting and abrasion. For sheet metal less than 1.1 mm (0.042 in) thick,
5 T) Z, v7 F3 N1 A4 {protection shall be provided by one of the following methods:; ^4 K @# J9 O0 M$ B
(a) rolling the edge of the metal not less than 120 degrees;
9 u; v$ R$ R, z3 Z( G0 A, ^) W(b) a bushing or grommet of a material other than rubber at least 1.2 mm (0.047 in) thick; or
! J2 A' O, p# p3 j; J4 ^1 O9 W9 @6 J8 ~(c) glass sleeving at least 0.25 mm (0.010 in) thick.
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* t+ K) f4 H) g# O% {% m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:) K: j6 ]' ~. F! e" t
Tubing, extruded insulated是要满足 Standard for Extruded Insulating Tubing UL 224 及C22.2 No. 198.1 Extruded Insulating Tubing; S* \; m4 \- A5 V W6 \* r
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 Tubing6 r% g+ r. M4 @8 U% f2 g
# A b$ N, g' @7 @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 7 E4 |- q* B, e( ^
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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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