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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。+ ^. Y0 A R0 W+ G; ]$ a
引用EN 60335-1 29.3对于附加绝缘和加强绝缘的要求:: J- x1 P) V/ L$ X
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.) i" |3 }0 O) h% Q4 y& U# M
Compliance is checked by
, Q4 b$ G- y8 k, {( ~# x8 U– measurement, in accordance with 29.3.1, or by
' I6 O) P. j% E% B# A) F– 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
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. A. s: @% t k. w1 w' i29.3.2 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. S/ q/ T% K' E$ L
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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