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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:
! h; L! ^/ Q( W# e3 o% H. j2 b5.14 Conductor protection
* H6 Y6 Y C1 u& [( M$ K$ g$ z5.14.1 Conductors that pass over edges or through openings in metal shall be secured from contacting
4 m# g0 {# c b) {9 X! b) tthe edges or be protected from cutting and abrasion. For sheet metal less than 1.1 mm (0.042 in) thick,$ ~( ^% I5 L0 c) d* `/ a; j* w
protection shall be provided by one of the following methods:+ [" a3 [% h, p+ P
(a) rolling the edge of the metal not less than 120 degrees;5 w& \3 P. l0 z2 O- C' z
(b) a bushing or grommet of a material other than rubber at least 1.2 mm (0.047 in) thick; or1 F" W! R+ M7 t5 o* E
(c) glass sleeving at least 0.25 mm (0.010 in) thick.3 c3 C6 n; R4 V! y; x# L: x
3 D3 B( h2 ?$ ]: Y! K7 b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:" n6 G' f# h. e$ X5 A
Tubing, extruded insulated是要满足 Standard for Extruded Insulating Tubing UL 224 及C22.2 No. 198.1 Extruded Insulating Tubing3 ]+ K: z/ r/ R/ k" ]
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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, q, v. ~: T# ]) g3 d! o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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