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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。. n( G8 A3 O5 g: S; T- f* y
引用EN 60335-1 29.3对于附加绝缘和加强绝缘的要求:
# ~2 d: U! D* f% ~6 x4 \, V29.3 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.% s5 a2 _! w3 ]! H' y d- m5 V4 g
Compliance is checked by) E9 |1 x S0 g
– measurement, in accordance with 29.3.1, or by
/ _& A0 B5 o1 X# e9 h, u$ o, A– 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
9 m+ w- T, j, X+ w& Q
* y! @; D: w" w0 O( c7 A29.3.2 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.8 p& c( ]) i/ I. @7 e
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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