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对于水壶上的PTC元件,由于内部的发热元件通常会用3层绝缘胶纸密封良好,该绝缘胶纸单层可以通过1750V要求,采用3层即可满足加强绝缘的要求。
$ ]$ E; m7 m7 @- ^6 t% u引用EN 60335-1 29.3对于附加绝缘和加强绝缘的要求:2 n" c/ F2 e$ H
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.( G* I: w! w9 R7 W
Compliance is checked by
0 N, O+ v, l+ Z4 q: W4 P7 v– measurement, in accordance with 29.3.1, or by
) Q5 v6 K* o* a; L* O. W1 Z: p– 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
6 {, R1 R- Y; Z& G0 v" O; F) n' L; w' h* D3 `( p
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.
6 F& R/ X5 _$ C9 ~6 y此时对PTC元件外面的金属外壳的要求是加强绝缘的要求,根据EN 60335-1的要求,是打3000V,一分钟,不出现击穿即可。 |
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