29.3的要求适用于导线吗？

yearl

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29.3中关于绝缘的要求适用于导线吗？如对护套绝缘层厚度的要求。

山炮

问得好，结合24.1的注1，确是让人烦。但通过电线的标准可知护套层是没有1mm厚的，考虑到最薄点，那就更小，所以不适用。

yinke

那如果说要用护套做为内部线的附加绝缘  那岂不是不行?

yearl

就是怪怪的。
  [s:3]

alvistan

看23.5 note 3的说明

yinke

引用第4楼alvistan于2011-10-09 16:40发表的  :
看23.5 note 3的说明

the sheath of a cord complying with IEC 60227 or IEC 60245 may provide supplementary insulation
什么样的sheath符号 IEC 60227 or IEC 60245 ?

jennychen

适合于只有基本绝缘的内部导线上的附加绝缘，若作为绝缘的套管厚度不够1mm，则要求至少有2层。

luqing_sz

引用第0楼yearl于2011-10-09 08:00发表的 29.3的要求适用于导线吗？ :
29.3中关于绝缘的要求适用于导线吗？如对护套绝缘层厚度的要求。

有三种方法判断:
29.3 !Supplementary insulation and reinforced insulation shall have adequate thickness, or have a sufficient number of layers, to withstand the electrical stresses that can be expected during 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 flakey material, or by – an assessment of the thermal quality of the material combined with an electric strength test, in accordance with 29.3.3. and, for accessible reinforced insulation consisting of a single layer, measurement in accordance with 29.3.Z1. !29.3.1 The thickness of the insulation shall be at least – 1 mm for supplementary insulation; – 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. 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 Clause 19.  At the end of the period, the insulation is subjected to the electric strength test of 16.3 at the conditioning temperature and also after it has cooled down to room temperature. If 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."

极品老工

23.5认为符合60227或者60245的电线护套层可用作附加绝缘，这就说明了电线的护套层不必满足29.3的要求，但其他的套管还是要满足要求才能用作附加绝缘。这个差异性可能与60227或者60245的电线护套的性能是经受了大量试验所验证的。通过标准表3中的温升限制值，电线的护套层也享受比其他用作附加绝缘的护套高15K的待遇。

yearl

引用第8楼特级工程师于2011-10-10 10:00发表的  :
23.5认为符合60227或者60245的电线护套层可用作附加绝缘，这就说明了电线的护套层不必满足29.3的要求，但其他的套管还是要满足要求才能用作附加绝缘。这个差异性可能与60227或者60245的电线护套的性能是经受了大量试验所验证的。通过标准表3中的温升限制值，电线的护套层也享受比其他用作附加绝缘的护套高15K的待遇。

说得很在理。