电工绝缘胶布作附加绝缘

yearl

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II类器具，通过外壳的开口，试验指触及到了带电部件的基本绝缘。
, y1 [2 Q; O7 @  N7 q+ }现在想用两层电工绝缘胶布缠绕在基本绝缘上作为附加绝缘。
请问这样可以吗？
如果不可以，违反了标准的哪些条款？

hgf397556998

个人认为，需要符合绝缘耐热，绝缘就是附加绝缘的耐压试验，耐热应当没问题，如果有认证自然更好，但是29章貌似对附加绝缘有厚度要求，你的绝缘胶布行吗？

yearl

6 n# x! A0 Y5 s. I& l: P
两层薄层材料，每层都符合附加绝缘要求；
/ J( J$ a- P5 n% s' G6 M1 e: @6 _虽然厚度小于1mm，但是隔着外壳，有必要进行21.2的刮擦试验吗？
- [' Y" `# M8 z8 A隔着外壳，不应判为可拆卸部件；
第19章试验时温升值不超过表3，不必进行干热试验。
所以我找不出不可以使用的依据。

Dan_Tan

以面两种情况OK
: N0 i! v% N: t1 k; P1， 加一层厚于1mm的套管
2，加两层可套管（每层需分别可通过电气强度测试）

标准要求如下：
  o5 t4 P7 E. C* h29.3 Supplementary insulation and reinforced insulation shall have adequate thickness,
. |% M) E" F0 w0 }' Jor have a sufficient number of layers, to withstand the electrical stresses that can be expected
, g8 |; C* H% m* }: kduring the use of the appliance.
Compliance is checked
5 E+ H. f8 h0 E2 b2 `+ d" |– by measurement, in accordance with 29.3.1, or
– by an electric strength test in accordance with 29.3.2, if the insulation consists of more
than one separate layer, other than natural mica or similar flaky material, or
– by an assessment of the thermal quality of the material combined with an electric strength
/ P* u: F) N( Jtest, in accordance with 29.3.3 and for accessible parts of reinforced insulation
consisting of a single layer, by measurement in accordance with 29.3.4, or
9 P/ p" m/ j4 q7 _– as specified in Subclause 6.3 of IEC 60664-4 for insulation that is subjected to any
( j! F6 _0 W" C, W* Bperiodic voltage having a frequency that exceeds 30 kHz.
! ^; X: G" t4 k/ G* `. p* E29.3.1 The thickness of the insulation shall be at least
– 1 mm for supplementary insulation;
. o; }. H2 m4 d6 [! x! n– 2 mm for reinforced insulation.
29.3.2 Each layer of material shall withstand the electric strength test of 16.3 for
supplementary insulation. Supplementary insulation shall consist of at least 2 layers of
material and reinforced insulation of at least 3 layers.
8 K( W/ v7 |# n29.3.3 The insulation is subjected to the dry heat test Bb of IEC 60068-2-2 for 48 h at a
' N* I$ F7 |3 B: f/ F, Ptemperature of 50 K in excess of the maximum temperature rise measured during the test of
: z" h8 f. d$ [9 ~4 w1 d, FClause 19. At the end of the period, the insulation is subjected to the electric strength test of
' j+ N' c5 X) W" t# h- G6 R) }( P16.3 at the conditioning temperature and also after it has cooled down to room temperature.
+ @4 V7 t/ H: ?+ m$ |; OIf the temperature rise of the insulation measured during the tests of Clause 19 does not
exceed the value specified in Table 3, the test of IEC 60068-2-2 is not carried out.
3 c9 P' k( |* P4 d+ u+ A1 g, k0 F
. A, R0 ]; r9 u$ P7 s

winson1982

要是符合绝缘要求的话个人觉得应该可以的，但一定要可靠固定，比如加根扎带

一行白鹭上青天

yearl 发表于 2013-5-5 11:16
: a  L/ t' l  b  i1 Y! Y! P两层薄层材料，每层都符合附加绝缘要求；
  I9 w9 }: C- J! X, J9 d虽然厚度小于1mm，但是隔着外壳，有必要进行21.2的刮擦试验吗？
8 h/ k/ w- A* O$ D1 Q- U) ?4 ` ...

: U" `4 e* v5 g1 j我最近也在找这个问题，找不到理由不能用，但又觉得不合适。请问前辈您当时是怎么解决的？

innochina

量产产品中，不应该使用电工胶布这种东西进行绝缘，
+ c' \/ @6 C* }8 ]" v1 Y) g+ e1.因为用胶是不可靠的固定方式，
2.你无法控制胶带缠绕的总厚度，
3.改小开口挡住试验指，或者安装挡柱试验指的零件不碰到带电部分，