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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。' `% D6 y0 v, ?5 I
引用EN 60335-1 29.3对于附加绝缘和加强绝缘的要求:
) V- \. O! o, S29.3 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.) y m+ c" q: P g- S/ t
Compliance is checked by9 P2 I2 ^+ M1 V" q
– measurement, in accordance with 29.3.1, or by
* `: j! U# c( Y) X& 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
, c7 b0 P$ H/ i$ y! R0 G
6 h0 \+ W4 d T& F" K; E29.3.2 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.
( P% v8 l, W5 P* B" n6 X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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