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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。
, h7 N7 Z! d) ]9 Z5 B; B引用EN 60335-1 29.3对于附加绝缘和加强绝缘的要求:
: o) G- L7 o+ E% }! d/ a! F6 O29.3 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.
% B& G9 N; s! N1 x+ qCompliance is checked by' S* N2 \' I0 |6 b
– measurement, in accordance with 29.3.1, or by
9 W# r3 x2 z3 l6 L/ x% `# T4 @7 {– 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 by2 J# d' q: v( [: A
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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." f; o' m1 l; v% P
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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