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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。
: }% ~2 t0 o" `! W2 W% n& j& J3 d引用EN 60335-1 29.3对于附加绝缘和加强绝缘的要求:
1 B2 B7 j/ h$ j. d2 H7 ~; L29.3 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.
% U% D J6 p# Q2 g$ \- o/ v9 k( BCompliance is checked by
% ?( t3 v) v: H |7 g9 H– measurement, in accordance with 29.3.1, or by
4 T/ ^8 q9 w- z% |* [6 {" t– 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
, b% P; ]8 H# x K! ?- P
2 k$ H% t9 o: _& _0 I1 U29.3.2 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. X1 G9 V( C* r% u
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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