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。
/ b+ @2 z% S8 M- T' o0 Q, {  e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？
$ ?" |5 T+ s2 j* V8 B如果不可以，违反了标准的哪些条款？
8 p2 M0 D& ^. B6 [  k. R: c+ a0 \

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

$ Y& A* j+ l$ `两层薄层材料，每层都符合附加绝缘要求；
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？
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
1， 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）
) e+ i9 i' M- ?8 K' s+ U
: u" |; {& d1 ]/ U( A- s0 ^: f标准要求如下：
29.3 Supplementary insulation and reinforced insulation shall have adequate thickness,
! D& c1 g( U, p& |9 Aor have a sufficient number of layers, to withstand the electrical stresses that can be expected
4 {% D! m) O- G4 r  Q" q% Wduring the use of the appliance.
Compliance is checked
– 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
- q/ a: F; _$ C( }" ^! ?- J- rtest, in accordance with 29.3.3 and for accessible parts of reinforced insulation
5 s; X* d& P9 ~7 `, q8 J8 O3 Vconsisting of a single layer, by measurement in accordance with 29.3.4, or
3 d- {; C7 K! N5 g9 f– as specified in Subclause 6.3 of IEC 60664-4 for insulation that is subjected to any
periodic voltage having a frequency that exceeds 30 kHz.
29.3.1 The thickness of the insulation shall be at least
– 1 mm for supplementary insulation;
– 2 mm for reinforced insulation.
( u* S& k. H9 [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
' m# G/ y1 R3 Dmaterial and reinforced insulation of at least 3 layers.
/ V& B+ {7 A) }29.3.3 The insulation is subjected to the dry heat test Bb of IEC 60068-2-2 for 48 h at a
temperature of 50 K in excess of the maximum temperature rise measured during the test of
; x, `4 ^7 v0 k/ WClause 19. At the end of the period, the insulation is subjected to the electric strength test of
9 ^+ p* ~% M4 X9 C9 c/ h! m16.3 at the conditioning temperature and also after it has cooled down to room temperature.
' D! R" y6 b5 MIf the temperature rise of the insulation measured during the tests of Clause 19 does not
) @% n! P5 Y  h/ J$ _+ r6 oexceed the value specified in Table 3, the test of IEC 60068-2-2 is not carried out.

; c( C8 Q3 y- N5 d+ I, y# j

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
两层薄层材料，每层都符合附加绝缘要求；
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？
$ _5 T  d% v" e7 |4 _ ...

: u+ K' j' k& ^, \  {4 N  ]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，
1.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，