|
|
本帖最后由 Liu 于 2011-12-31 01:00 编辑 3 I1 z8 _3 T* _
% A6 H! ]5 ~+ |& A0 Y4 J3 _3 J
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:# L8 m p+ S0 D+ ~ w
5.14 Conductor protection
% O, h; T6 V2 f. [5.14.1 Conductors that pass over edges or through openings in metal shall be secured from contacting$ |9 g5 u) t! x+ Z
the edges or be protected from cutting and abrasion. For sheet metal less than 1.1 mm (0.042 in) thick,
: u+ E; @" C& G2 _( T3 xprotection shall be provided by one of the following methods:5 m- Y k8 ]9 L7 F- \! L B! h
(a) rolling the edge of the metal not less than 120 degrees;
; R: G5 m8 | Y" r(b) a bushing or grommet of a material other than rubber at least 1.2 mm (0.047 in) thick; or
% \ g; Z, O- ?0 Z2 n5 m! B(c) glass sleeving at least 0.25 mm (0.010 in) thick.
9 N, Z Y( D# V7 H1 t3 s- h4 Z) h/ l
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:0 n4 I: v& k$ p- h) V2 f" o% Y9 b
Tubing, extruded insulated是要满足 Standard for Extruded Insulating Tubing UL 224 及C22.2 No. 198.1 Extruded Insulating Tubing; I6 O1 R3 X9 {( ~, p+ 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
% f- `% Y* V: F* O' m2 h7 ^! A# _! I, L/ Y0 |, b
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
, D, n6 x* S: f5 h4 `& z$ z" e3 O' c$ ~1 u+ N- ]
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。 |
评分
-
查看全部评分
|