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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。
, K8 {: ]& ~! z1 \! C# v- ], |0 v引用EN 60335-1 29.3对于附加绝缘和加强绝缘的要求:! Z3 h8 {# B3 [$ {2 V
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.
8 R' Z0 y' Z. s0 j+ d5 H9 q& fCompliance is checked by; f; `, p2 Z! ^) T1 t
– measurement, in accordance with 29.3.1, or by. q# l/ ]# |2 u2 a) D) M7 B: ?
– 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& M2 t' r: q1 O0 w) O' r0 t
% y# c5 Z; v* k29.3.2 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.
$ z5 @* s! Z6 d% S v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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